Author Topic: Replacement Knobs, Feet and Fittings for Test Equipment  (Read 6846 times)

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Online beanflying

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Replacement Knobs, Feet and Fittings for Test Equipment
« on: March 09, 2019, 06:30:44 am »
Why - Because old bits break or are lost or stolen before we get hold of the Test Equipment.

Solution - Try and buy the unobtanium from generally an overpriced evilbay auction or in the remote and forlorn hope a manufacturer will still have stock for your 40 year old precious. Or you make or have made for yourself a replacement by a range of different methods.

So rather than having solutions to this problem lost diluted and otherwise dispersed here in sometimes long winded threads (Yes TEA I am looking at you ;) ) and across the WEB time for a common index page with links to posts, videos or elsewhere.

Any Knob, Foot, Clip, adapter and fairly much anything mechanical you have made or designed as a solution to keep your Test Equipment in use.

STL or CAD files can be put in a Zip and added to posts would be great. Anyone found using that work for commercial gain without express permission can expect to be :horse:
« Last Edit: March 09, 2019, 09:52:21 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #1 on: March 09, 2019, 06:32:38 am »
Index by Manufacturer - others to follow as needed.

Fluke

Foot 5200A Calibrator Foot The DefPom Thingiverse
Foot Side Clip and rubber, suits  5440B/510x/850x and others?  Beanflying Link to this thread
Foot Rear suits 8505A or 8506A part #645945 Pigrew Thingiverse
Various from a Yeggi Site search https://www.yeggi.com/q/fluke/


Hewlett Packard

Adapter IR adapter Handheld Agilent/Keysight meters https://www.thingiverse.com/thing:2596378
Bezel Analogue Meter Power Supplies suits ? https://www.thingiverse.com/thing:225449
Bezel Rear to suit 34401A and maybe other similar cases https://www.thingiverse.com/thing:2186112
Bezel CRT and Switch to suit 8753C VNA Hendorog Thingyverse listed as a WIP
Button Power and extension to suit E3631A and maybe others? https://www.thingiverse.com/thing:1829229
Button Power suits 3478A and maybe others kirill_ka Forum link here
Button Power suits 8640B + others https://www.thingiverse.com/thing:2780202
Cover System Power Supplies rear Outlet https://www.thingiverse.com/thing:2476186
Cover HP909 A C & E rear outlet termination https://www.thingiverse.com/thing:2813343
Foot Clip in suits a wide range of Gear The DefPom Thingiverse & https://www.thingiverse.com/thing:2332520
Foot, Suits 5300A &B and other Aluminium Diecast Cases Beanflying link to this thread
Foot, Suits 34702A, 5300A & B and other Aluminium Cases VK5RC's take on the foot above
Foot, Rear 8565A spectrum analyzer should suit others https://www.thingiverse.com/thing:2492594
Foot, Rear part number 5041-8821 / 5040-7221 older Spec Analyzers and others TerrorOperative Thingiverse
Foot, Front and Rear to suit 8590 Spectrum Analyser and maybe others Bicurico link to this thread
Foot, Generic 40mm long cord wrap replacement for older HP 17XX scopes and other equipment. Beanflying link to this thread
Foot, Generic 35mm long cord wrap replacement for older HP 17XX scopes and other equipment. (correct length) Beanflying link to this thread
Foot, Snap in to suit 3458B and others CatilinaWOW link to this thread
Frame Clip and PCB mount, suits 5300A and 5300B based measuring systems Beanflying link to this thread
Knob 1/4" Plain shaft with CAD files via link. Details here Beanflying link to this thread
Knob 1/4" Plain shaft with Cad Files via link. Tweaked version of one line up! Beanflying link to this thread
Knob 1/4" Push on simple HP'ish style by JohnPi https://www.thingiverse.com/thing:3546393
Panel LAN outlet for DSO2000/3000 Scopes https://www.thingiverse.com/thing:2594001
Panel Support Input Assembly 3403C https://www.thingiverse.com/thing:1886419
PCB Card Lever Suits older Card based equipment (4261A + others) The DefPom - Thiniverse
Various from a Yeggi Site search (sorry lots of NON Test gear too) https://www.yeggi.com/q/hewlett+packard/
Wheel/Knob Logic Analyzers DaJMasta https://www.thingiverse.com/thing:3471479
82143A Thermal printer parts VK5RC link to this thread



Keithley

Foot suits 2xxx series gear Pigrew Thingiverse



LeCroy

Foot, Extra Rubber Foot Bumper for Wavepro/Master and multiple other models DaJmasta https://www.thingiverse.com/thing:3437386
Foot, Rear Wavepro/Master with rubber insert DaJMasta https://www.thingiverse.com/thing:3437363
Various from a Yeggi Site search https://www.yeggi.com/q/lecroy/



Racal-Dana

Button Numerical Keyboard set suits some Counters Pigrew Thingiverse



Rhode & Shwarz

Foot, Extra Rubber Foot Bumper for multiple models DaJMasta https://www.thingiverse.com/thing:3453904
Knob, Encoder suits CMU2000 & CRTU Bucurico link to this thread



Stanford Research Systems

Button, Power for SR560 Pre Amp DaJMasta may suit others https://www.thingiverse.com/thing:3463854
Bezel, Front for SR560 Pre Amp DaJMasta https://www.thingiverse.com/thing:3463843



Tektronix

Clip, Plugin pull tab suits TM503 and others? CatilinaWOW and again a few posts later
Foot, Rear Cable Wrap Suits 500 Mainframes and 400 series Scopes Rerouter link to this thread
Knob, Vertical Gain extension to suit SC504 CatilinaWOW link to this thread  Link to files
Various from a Yeggi site search https://www.yeggi.com/q/tektronix/?s=tt



Valhalla

Foot Rear suits 2703 AC Calibrator The DefPom Thingiverse
Handle Front suits 2703 AC Calibrator The DefPom Thingiverse

Non Brand Specific designs

121GW Bumper Hangers - Magnetic and Webbing Beanflying link to this thread
121GW Tilting Bail extension Chlor link to Thingiverse
Anti Vibration Fan Gaskets - various sizes (TPU or similar flexible filament) DaJMasta Thingiverse
Xantrex power supply Button - Power may suit others too salvagedcircuitry link to this thread
« Last Edit: June 22, 2019, 10:07:05 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #2 on: March 09, 2019, 06:33:12 am »
Construction Techniques and How to Guides

YouTube Videos

Cloning Vintage Knobs
Code: [Select]
https://youtu.be/aNBHtlhlHF4
Quick/Easy Knobs
Code: [Select]
https://youtu.be/qBBqvF8koJI
How To Mold & Cast Vintage Radio Knobs
Code: [Select]
https://youtu.be/sHH6WHNoLoI

Other Web Pages

Repair a HP Knob by TerraHertz http://everist.org/NobLog/20131122_an_actual_knob.htm


Recommended Secondhand Dealers of Unobtanium

https://www.sphere.bc.ca/index.html all sorts of Test Gear Spares
https://www.surplussales.com/ lots of bits and spares
« Last Edit: March 09, 2019, 08:55:53 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #3 on: March 09, 2019, 06:47:44 am »
Rear Foot to Suit Hewlett Packard 5300 A & B and other Split Aluminium Cased HP equipment.

Fairly simple to start this thread off. 3D printed solution to what seems to be a fairly common failure of the original plastic foot. Printed in PLA as pictured with supports on the bed. Use 0.1mm Layer height if you want a smoother look but no one else should be looking under there to see ;)

Zip file contains both the STL and Fusion 360 CAD file.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #4 on: March 09, 2019, 06:55:34 am »
Rear cable wrap feet and wire securing clip for Tektronics 500 series mainframes and 400 series scopes.

Edit: I have to ask for your HP feet why you didn't flatten off the middle area instead of doing 1:1,
« Last Edit: March 09, 2019, 07:00:15 am by Rerouter »
 
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #5 on: March 09, 2019, 07:10:46 am »
Same Aluminium case design but more specifically for the Hewlett Packard 5300A and 5300B with the quick release mechanism.

These models use a two piece clip to hold the circuit boards and front and rear split fascias in place as shown. Between the two I have at present they had a broken one of each. Today's project D&C a new one using Fusion and 3D printing again but made as a one piece item.

Mk1 and MK3 shown less parts and better clearance for the circuit board. Printed with the Web facing down and bed supports only. PLA 0.1mm height recommended.

Zip contains the STL and Fusion Cad file.

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #6 on: March 09, 2019, 07:17:25 am »
Rear cable wrap feet and wire securing clip for Tektronics 500 series mainframes and 400 series scopes.

Edit: I have to ask for your HP feet why you didn't flatten off the middle area instead of doing 1:1,

It felt good at the time ;) I guess I was keeping it more original, printing it side on would have got a better finish but lower strength. Rob AKA VK5RC has done a foot for the same series with a flat base he might like to add?

Next project is some sort of knob outer for this brass insert on the same chassis or I may just make a new one from scratch - tomorrow's job.

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Offline DaJMasta

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #7 on: March 09, 2019, 07:23:27 am »
Thingiverse already has a few, and I've put a few of my own creations up there: https://www.thingiverse.com/DaJMasta/designs
Some lecroy scope feet/bumpers based off another member's work
A knob for a 169XX/168XX series logic analyzer encoder
A front bezel and power button for an SRS SR560 preamp (may fit other bits of theirs, like the high voltage power supply and function gen, they look similar)
Rohde & Schwarz foot bumpers for some instruments from earlyish 2000s up until a couple of kinds today (fits UPV/AMU and likely many others)
 
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #8 on: March 09, 2019, 07:26:28 am »
Thingiverse already has a few, and I've put a few of my own creations up there: https://www.thingiverse.com/DaJMasta/designs
Some lecroy scope feet/bumpers based off another member's work
A knob for a 169XX/168XX series logic analyzer encoder
A front bezel and power button for an SRS SR560 preamp (may fit other bits of theirs, like the high voltage power supply and function gen, they look similar)
Rohde & Schwarz foot bumpers for some instruments from earlyish 2000s up until a couple of kinds today (fits UPV/AMU and likely many others)

Thanks. I do plan to link as many appropriate items I can find on on Thingyverse. I do have a few from the defpom and others bookmarked.

Anyone want to save me some time feel free to add a link here  ;)
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Offline Inverted18650

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #9 on: March 09, 2019, 07:28:27 am »
Right on. I will work out this project this weekend. I will upload pics and measurements as well as all STL/CAD files so they can be fixed if I make a mistake. Stoked and this thread is long over due... :-+

Note: I have a small foundry here as well and have used my 3D prints as casts to pour molten aluminum over with great success. In a sand cast the heat from the molten melt dissolved the plastic instantly for a solid metal product. I keep to small parts with my setup but I could see this thread blowing up between 3D and foundry’s.
« Last Edit: March 09, 2019, 07:35:23 am by Inverted18650 »
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #10 on: March 09, 2019, 09:23:46 am »
Added a few of the already provided links above to the first posts. Let me know if you think it needs to be done differently before the list gets to long?
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #11 on: March 09, 2019, 09:37:51 am »

Next project is some sort of knob outer for this brass insert on the same chassis or I may just make a new one from scratch - tomorrow's job.

Are those the same size as the HP 6236B knobs?  I see a fair number of HP devices with broken or partially missing knobs that could use them.  ;)
 

Offline Inverted18650

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #12 on: March 09, 2019, 09:38:35 am »
Do you want us to PM you with details so you can arrange it or post them here? I don’t want to mees up when I am really trying to help...done that before...lol

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #13 on: March 09, 2019, 09:49:28 am »

Next project is some sort of knob outer for this brass insert on the same chassis or I may just make a new one from scratch - tomorrow's job.

Are those the same size as the HP 6236B knobs?  I see a fair number of HP devices with broken or partially missing knobs that could use them.  ;)

Unsure about compatibility. I was going to make a size for size clone as close as I can to the genuine item and it won't take much to do a version with and without the Brass insert. Most likely the whole plastic one I will base on using 2mm knurl nuts (inserted from the bore) and grub screws. The other will be a matter of heating the current brass insert then squeeze it into the knob.

I will do a photo montage of how to insert knurl nuts into 3D prints or chase up a Video that already shows them in use.

Do you want us to PM you with details so you can arrange it or post them here? I don’t want to mees up when I am really trying to help...done that before...lol

Just post any and all here and I will then link the individual post, thread or link as above. Add your own photos, files and any comments you think needed to make it I guess.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #14 on: March 09, 2019, 06:17:25 pm »
I grabbed my calipers and found that the diameter at the flared part of the knob, where it's widest, is about 1.6cm and coincidentally the length of the knob is also pretty close to 1.6cm.  So if that's about the same as yours, it's pretty certain to be the same knob.
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #15 on: March 09, 2019, 08:53:19 pm »
I'd like to find a speed knob, ie. one with a small rotating handle, to replace the 13 mm diameter knob on the multurn controls on some hp equipment.  eg., I have an hp 6002A power supply that uses 10 turn pots for the voltage and current settings.  I don't use the supply as much because it takes so much longer to get the desired setting making it inconvenient for quick tests.  hp did make a compatible speed knob for one instrument but they are as scarce as hens teeth.  I've been thinking of making one where a small hp  knob is the rotating bit on the end of eccentric that attaches to the control's shaft.  I've also thought about replacing the controls with encoders and some electronics to implement a ballistic or variable speed adjustment.  ie., the faster the control is turned, the greater the change in the setting.

I'd also like to find a switch guard that protects switches or other controls from being damaged.  I saw some spiffy looking ones on the Space Shuttle console.  Some enthusiasts are making copies but they're too pricey for me.  The ones made of folded sheet metal look out of place on hp equipment.
 

Offline HalFET

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #16 on: March 09, 2019, 09:55:00 pm »
I'd like to find a speed knob, ie. one with a small rotating handle, to replace the 13 mm diameter knob on the multurn controls on some hp equipment.  eg., I have an hp 6002A power supply that uses 10 turn pots for the voltage and current settings.  I don't use the supply as much because it takes so much longer to get the desired setting making it inconvenient for quick tests.  hp did make a compatible speed knob for one instrument but they are as scarce as hens teeth.  I've been thinking of making one where a small hp  knob is the rotating bit on the end of eccentric that attaches to the control's shaft.  I've also thought about replacing the controls with encoders and some electronics to implement a ballistic or variable speed adjustment.  ie., the faster the control is turned, the greater the change in the setting.

I'd also like to find a switch guard that protects switches or other controls from being damaged.  I saw some spiffy looking ones on the Space Shuttle console.  Some enthusiasts are making copies but they're too pricey for me.  The ones made of folded sheet metal look out of place on hp equipment.

I wonder if you could get better result with with using acetone polished 3D prints and then give them a coat of matte metallic spray paint and lacquer to protect the metal finish. Alternatively, a block of metal, a drill and a few files could work. Getting that HP surface finish on it might be a bit tricky though. :(
 

Offline Neomys Sapiens

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #17 on: March 09, 2019, 10:35:53 pm »
Information on various sub-types of Tektronix TM500 latch tabs is here:
https://www.eevblog.com/forum/testgear/tm503-plug-in-broken-removal-levertabpull-help!
 
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #18 on: March 09, 2019, 10:41:00 pm »
Next project is some sort of knob outer for this brass insert on the same chassis or I may just make a new one from scratch - tomorrow's job.

Knob shown in your 5302 picture is in fact the p/n 0370-1099 which is the same part as on the 6236B.  If I may suggest: providing a .stl file for the knob (or even just the cap which covers the end!) would make many new friends and maybe bring you a little $$$.  They seem to be very much in demand and going for $20 and up - on everyone's favorite auction site.  :)  I'm watching a few 6236B units right now, and ALL of them are missing knob caps.
 

Offline ferdieCX

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #19 on: March 09, 2019, 10:56:41 pm »
You will find here some CAD files to print Tektronix feet and knobs

https://www.yeggi.com/q/tektronix/?s=tt
 
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #20 on: March 09, 2019, 11:28:24 pm »
Next project is some sort of knob outer for this brass insert on the same chassis or I may just make a new one from scratch - tomorrow's job.

Knob shown in your 5302 picture is in fact the p/n 0370-1099 which is the same part as on the 6236B.  If I may suggest: providing a .stl file for the knob (or even just the cap which covers the end!) would make many new friends and maybe bring you a little $$$.  They seem to be very much in demand and going for $20 and up - on everyone's favorite auction site.  :)  I'm watching a few 6236B units right now, and ALL of them are missing knob caps.


Yep looks like it :) Knobs like this with fine detail look like a candidate for 0.2mm nozzles or better again SLA printing or even resin casting (like in the linked videos on post #3)

Given the metal ring is likely gone if the cap is then I will try a snap in replacement based on that as well as a version with the metal ring. This part will be fine with FDM @0.1 layer I reckon.

The main body will be a similar option. One reusing the Brass insert from the original fused back in and another in straight plastic with knurl nuts for the grubscrews.

Thanks to the others for Links I will add them up soon  :)

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #21 on: March 09, 2019, 11:41:59 pm »
You will find here some CAD files to print Tektronix feet and knobs

https://www.yeggi.com/q/tektronix/?s=tt

Thanks I had forgotten about Yeggi. Works well for some but no so much for Hewlett Packard unless you sort past the Notepad widgets  :)
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #22 on: March 10, 2019, 06:50:52 am »
Mk1 HP Knob to see if the knurl section will 3D print 'ok' before going further with the other detail and parts. Printed with with supports (internal) with a 0.4mm nozzle 0.1 layer with PLA on one of my Ender Pro's.

Odd blobbing off the Ender on the sample I haven't ever seen before (might be nozzle or slicing issue)  :-// Looks like you can print the 40 flutes on these with FDM and a 0.4 nozzle but if you want to get a better cosmetic look 0.2mm or an alternate method would be better.

Based on this roughy I will continue on with the plan a couple of posts back and leave it up to the individual how they make it from there.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #23 on: March 10, 2019, 06:56:25 am »
you need more cooling if you want to pull it off correctly, Also the bubbling on some of the splines is because its decelerating at the corner of the splines, radius both the inside and outside to make it more like a correlated roof and they should reduce.
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #24 on: March 10, 2019, 07:26:58 am »
Another part that would be useful (but I don't have any plans for) are those little plastic bumpers that screw onto the back corners of the rear panels of HP equipment.
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #25 on: March 10, 2019, 07:30:54 am »
That will teach me for not reviewing the GCode before printing.  :palm: Result was exactly what it miscalculated.

Oddball Sli3er Prusa issue with the small flutes I guess.
« Last Edit: March 10, 2019, 07:32:56 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #26 on: March 11, 2019, 12:04:59 am »
Random idea for the HP knobs to make a better clone. Standard Hardware store Cup Washer (11mm OD 4mm bore) reworked to make a replacement metal trim for the knob. Would require a female form to round the edge over on but a correct thickness peice of steel  (1.5mm) with a hole drilled in it then peen the lip over then finish as required with a Dremel/Files etc.

In an ideal world you would make a proper tool for stamping/punching them out but this might suit for a one off home option.

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #27 on: March 11, 2019, 12:32:32 am »
Random idea for the HP knobs to make a better clone. Standard Hardware store Cup Washer (11mm OD 4mm bore) reworked to make a replacement metal trim for the knob. Would require a female form to round the edge over on but a correct thickness peice of steel  (1.5mm) with a hole drilled in it then peen the lip over then finish as required with a Dremel/Files etc.

In an ideal world you would make a proper tool for stamping/punching them out but this might suit for a one off home option.
Investigate plastic joinery buttons used for hiding screw heads for capping the knobs.
Some have a spigot that inserts into Robinson (square drive) screws.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #28 on: March 11, 2019, 04:13:09 am »
Great thread, bean. Here are all my bookmarks for a variety of parts on Thingiverse.

HPAK
Bonus (not a spare part):
Wall mount for HPAK DMMs with IR interface: https://www.thingiverse.com/thing:1056579

Keithley
Fluke 
Valhalla 
Racal-Dana
I TEA.
 
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #29 on: March 11, 2019, 06:23:30 am »
Thanks @Bitseeker will add yours later in the evening.

Bizarre thing with the HP Knob reduced the export quality from Fusion into sli3er PE and the Spaghetti Monster from yesterday went away seems I overloaded it's brain :-//

Still not 100% done but this one is dimensionally close to the real deal if anyone wants to print it and take a look. This one will take the HP Brass insert with a little heat to slide it in and the grubscrews protruding into the alignment slots I have put in the design so the holes line up while you do that. Switch off thin wall detection and print at 0.1 should get a result.

Edit of the Edit of the Edit - ZIP now removed. Updated Zips further down this thread or found in the Index under HP Knobs.
« Last Edit: March 14, 2019, 05:26:29 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #30 on: March 12, 2019, 02:37:12 am »
Eight other colours but no Grey and a non bright Green time to add more Filament to the stash :palm:

I have sorted out the high quality STL spaghetti issue but the file goes over the 1Mb allowed here. When I have a set including a Cap I will put them on my Google Drive and link them with a separate post.

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #31 on: March 12, 2019, 03:13:34 am »
Here's a potentially useful one for the generic fittings category: a set of anti-vibration gaskets for common computer fans
https://www.thingiverse.com/thing:3486100
Have one that fit 40mm, 60mm, 70mm, 80mm, 92mm, and 120mm fans (was really easy to adjust dimensions on the sketch to crank all of them out), and they've been printed and test fit and the dimensions seem good.  Worth noting that this will only be useful for printers that can print flexible filaments, and the more flexible the filament, the better the anti-vibration performance, but a lot of printers can do TPU or similar, so they may help quiet down your fans without having to go buy a bunch of gaskets which tend to be a little overpriced imo.
 
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #32 on: March 12, 2019, 03:45:14 am »
so are you going to keep posting on how you improve gcode on agilent knob in this thread? go post the gcode in thingyverse, most people post stl there.
this msg will self destruct

I choose not to give my files to Thingiverse for a start and am unlikely to change my mind on that in the future. The files I choose to put up here are mine and available for any non commercial use including by stl hosting sites for their gain. Depending on the item and the complexity of the Print I tend to also post the Cad file so others can tweak it if required and also encourage others to have a go at CAD for their own.

As we all have different Slicers and Printers in use the best option is to give any Print Specific settings you think relevant to a particular STL. The Knob for example varies from 'my normal' PLA settings by using 0.1mm Layer and turning off 'Detect Thin Wall' and 'Avoid Crossing Perimeter' with no supports. These two were the principal cause of the Spaghetti.

I am sure these will have similar variations in other Slicers but I don't use anything else and have only really glanced Cura and Ideamaker but never used them seriously to know what settings are or are not available.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #33 on: March 12, 2019, 04:45:05 am »
Quote
I choose not to give my files to Thingiverse for a start and am unlikely to change my mind on that in the future. The files I choose to put up here are mine and available for any non commercial use including by stl hosting sites for their gain..

Thingyverse has common attr + Non commercial license, but what stopping others from downloading your model, mod it and repost on in their domain? with different licensing scheme?  like some of your links in op? Same Thing if you post your model here.. but i was not talking about your attached model, i was talking the process you are trying to achieve in few of your latest posts.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #34 on: March 12, 2019, 05:11:47 am »
Thingiverse - Makerbot - Strtasys get the support they have earned over time. Not very much at all :horse: It took a major public stink only a few years ago for Thingiverse to adopt their 'current' legal waffle 'subject to change'. As to their parents companies :bullshit: over time that is best left for another forum or thread. Basically I don't have any trust in them based on their combined history.

Here my files are offered by me and are here at my discretion and are offered under 'my rules' such as IP 'borrowing' for gain happens. There is some of my commercial and business print work that won't be as that is my D&C and IP to make money from. If others try openly to make $ from using them them at minimum they can expect a public flogging for IP theft and most likely me pursuing them to cease if they go down the evilbay path to resell. These low volume speciality designs and reimaginings for old test gear are unlikely to attract any serious commercial entity and more likely to be someone running a backyard printfarm using stolen designs because they have no clue or imagination to create their own. One example https://3dprint.com/120727/ebay-licensing-3d-models/

Process of what is put here to accomplish a good result as per the last post it is offered openly along with help on settings within the understanding that all Slicers and Printers are different. Feedback or suggestions on how a design could be improved should be welcome too as this is to benefit all in need of unobtanium.

In the case of the last few posts in particular if anyone had an idea on how to treat the top cap and washer I was throwing it out there for other ideas that may be better than mine.
« Last Edit: March 12, 2019, 05:23:45 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #35 on: March 12, 2019, 05:21:20 am »
lol i just put wooden bits

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #36 on: March 12, 2019, 05:56:40 am »
THANKS. I have been looking for a tektronix foot since forever :)
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #37 on: March 12, 2019, 06:10:18 am »
THANKS. I have been looking for a tektronix foot since forever :)

Cast a glance in the TEA thread (if you dare  ;D ) https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg2262690/#msg2262690 and the few follow up posts after the link regarding print orientation and materials. Basically stand it on the small part of the foot with supports for improved strength and allow the bolt to keep the layers together. Also Nylon, PETG or maybe ABS rather than PLA IMO in order of toughness.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #38 on: March 13, 2019, 06:54:32 am »
HP Knob 1/4" plain shaft, washer and Cap to suit reuse of the Stock Brass bush is at the Google Drive Link STL's along with the Fusion 360 CAD file. https://drive.google.com/open?id=16TDa7CEWRLShBq6--NWDScFT7Y22YXop

I still need to drop a 0.2mm Nozzle onto most likely my CR-10S/Glass Bed when I get the correct colour filaments in for a finished item. That said the samples in the photo came of my Ender Pro with a 0.4mm Nozzle and are physically great and cosmetically not horrid. The surface finish on the cap is due to a worn bed. Personally this entire job would suit SLA better than FDM.

FDM Print Guide - 0.1 Layers, PLA, No supports, Turn off detect thin walls in sli3er (or look for a similar setting in your slicer) to stop the Spaghetti from a few posts back.

The Washer is virtually unprintable with a 0.4mm Nozzle but the Cap print holds nicely without it into the printed Knob with or without it. A quick wipe with a paint marker could be done. as shown too.

Brass insert use a fat tip on a soldering iron set to 200'ish C with firm pressure. Make sure the allen screws are protruding slightly into the guide slots so the final position is correct.

For improved overall look most likely replace the lot on each bit of test gear as needed and sell the other unobtanium to fund more TEA  ;)
« Last Edit: March 13, 2019, 11:35:56 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #39 on: March 13, 2019, 12:20:37 pm »
Here's one for you:
HP 5040-7829 cord wrap foot, fits HP174* CRO's.

Thingiverse was useless and Google too.  :horse:

I've had a couple of these fine old CRO's both with missing feet on the back and as there's BNC's, a fuse holder and the CRT cover plate protruding, none of which make a stable foot to stand/store the scope.  ::)

Little project for someone with a sample to build a 3D model.
Drilled broom handle offcuts look a bit shit.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #40 on: March 13, 2019, 04:29:11 pm »
I've been working on the old style HP feet. Part number 5060-0767.
Still have to work out how to make the spring-loaded retaining pin, probably using an M3 cap screw, spring and nut or something.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #41 on: March 14, 2019, 12:21:41 am »
I've been working on the old style HP feet. Part number 5060-0767.
Still have to work out how to make the spring-loaded retaining pin, probably using an M3 cap screw, spring and nut or something.

You can fairly easily buy Flat Head Rivets in all sorts of lengths and diameters if you want to keep it more like the original. Try a Google search for "3mm flat head aluminium rivets" The 3x5mm collar and spring should be easy to sort out.

The few older Nixie Counters I have with those feet came with all attached  ;D But keep on with the design  :-+

Here's one for you:
HP 5040-7829 cord wrap foot, fits HP174* CRO's.

Thingiverse was useless and Google too.  :horse:

I've had a couple of these fine old CRO's both with missing feet on the back and as there's BNC's, a fuse holder and the CRT cover plate protruding, none of which make a stable foot to stand/store the scope.  ::)

Little project for someone with a sample to build a 3D model.
Drilled broom handle offcuts look a bit shit.


Send me one of the Scope's and I will send you some feet back in exchange :-DD Drop a picture of the foot here so we can have a look at if it is printable for a start?
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #42 on: March 14, 2019, 12:42:11 am »
Here's one for you:
HP 5040-7829 cord wrap foot, fits HP174* CRO's.

Thingiverse was useless and Google too.  :horse:

I've had a couple of these fine old CRO's both with missing feet on the back and as there's BNC's, a fuse holder and the CRT cover plate protruding, none of which make a stable foot to stand/store the scope.  ::)

Little project for someone with a sample to build a 3D model.
Drilled broom handle offcuts look a bit shit.

Drop a picture of the foot here so we can have a look at if it is printable for a start?
That's the thing, couldn't find an image with some searches but will look harder over the next few days.
Similar to the Tek one posted earlier but different in that they fit nicely with the corner of the case and they're quite long ~60 mm IIRC. Screw hole down the guts as is normal. As I remember they were a hard black rubber that got real brittle with age and they fell into chunks.
Someone here will have them and hopefully do a measure up so someone can do a 3D model.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #43 on: March 14, 2019, 12:52:52 am »
Looks like making something to do the job will be easy. Making a look alike without a sample impossible and not really that important I guess.

https://youtu.be/Cmz8bzUsj7E?t=1038

If you can measure the footprint or even the area available and where the screw sits relative to the edge and it's dimensions and a height needed to clear the transformer cover is all we would need to roll you a design based on the Tek one shown earlier.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #44 on: March 14, 2019, 01:27:16 am »
Looks like making something to do the job will be easy. Making a look alike without a sample impossible and not really that important I guess.

https://youtu.be/Cmz8bzUsj7E?t=1038

If you can measure the footprint or even the area available and where the screw sits relative to the edge and it's dimensions and a height needed to clear the transformer cover is all we would need to roll you a design based on the Tek one shown earlier.
Yep, them's the buggers.
As these HP's use an IEC lead there's really no need to have slots for the mains cable but the feet do need to be long enough to give good clearance for the CRT cover to ground.
Remember, these also used insulating feet for the days when it wasn't frowned upon to float your scope.

1/ So length required is 40 mm.
2/ Screw CL to case side edge max 10.5 mm. (so 21 mm min wide and square)(see 4 and 5)
3/ Screw CL to case top/bottom edge max 15.5 mm.
4/ Back panel to case edge/rim step 2.2 mm (in case you want to step up over it and make the foot slightly larger to the case side edge.)
5/ Case rim width 3.2 mm.
6/ Standard screw: remaining meat at bottom of screw recess 13.5 mm.
7/ Screw allow 3.5 mm dia.
8/ Screw head/washers allow for 8.5 mm dia.

These should fit in any of the 4 positions.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #45 on: March 14, 2019, 01:54:08 am »
Literally 5 minutes work.

Strongly suggest you run the bolt nearly full length to avoid layer shear. If the screw is to stay at 3.5mm then running a tube outside of that will help a lot so 3.5x5 or 6mm? Personally I would look and see if the chassis can be drilled and tapped to maybe 6mm?

The Foot outer I have made 31mm Square so a 5mm lip, partly it will give better stability when sitting on the feet but also would allow cable wrapping. The lower square is 21mm BTW

Simple print job when finished and I will send you a couple of sets over to play with.  :)

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #46 on: March 14, 2019, 02:19:02 am »
Literally 5 minutes work.

Strongly suggest you run the bolt nearly full length to avoid layer shear. If the screw is to stay at 3.5mm then running a tube outside of that will help a lot so 3.5x5 or 6mm? Personally I would look and see if the chassis can be drilled and tapped to maybe 6mm?

The Foot outer I have made 31mm Square so a 5mm lip, partly it will give better stability when sitting on the feet but also would allow cable wrapping. The lower square is 21mm BTW

Simple print job when finished and I will send you a couple of sets over to play with.  :)
Yeah they could be improved some however without cord slots they should be stronger.
I've allowed for 5 mm screw thread engagement with the standard screw that while this 1740 I have here has zero feet all the screws are there.  ::)
While I could put bigger screws in most that own these would just want a drop in replacement so it's a shame we haven't got the original length so ppls could just print one or two to suit their immediate needs.
Thought you'd add a lip.  ;)

Thanks again, that's very kind or you but these are a commonly missing/broken part and I was just trying to add to the great future resource you're building.
Only got one unit here and not likely to be chasing another as this was a freebie I'be had for some years and still haven't got around to fixing.  ::)
One set will be fine.  :)
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #47 on: March 14, 2019, 02:53:44 am »
Literally 5 minutes work.

Strongly suggest you run the bolt nearly full length to avoid layer shear. If the screw is to stay at 3.5mm then running a tube outside of that will help a lot so 3.5x5 or 6mm? Personally I would look and see if the chassis can be drilled and tapped to maybe 6mm?

The Foot outer I have made 31mm Square so a 5mm lip, partly it will give better stability when sitting on the feet but also would allow cable wrapping. The lower square is 21mm BTW

Simple print job when finished and I will send you a couple of sets over to play with.  :)
Yeah they could be improved some however without cord slots they should be stronger.
I've allowed for 5 mm screw thread engagement with the standard screw that while this 1740 I have here has zero feet all the screws are there.  ::)
While I could put bigger screws in most that own these would just want a drop in replacement so it's a shame we haven't got the original length so ppls could just print one or two to suit their immediate needs.
Thought you'd add a lip.  ;)

Thanks again, that's very kind or you but these are a commonly missing/broken part and I was just trying to add to the great future resource you're building.
Only got one unit here and not likely to be chasing another as this was a freebie I'be had for some years and still haven't got around to fixing.  ::)
One set will be fine.  :)

Extruding down to the lower level of 13.5mm is easy as is dropping back to the 3.5mm hole (3D print cross sections shown done below). The major difference with 3D printing over injection or rubber molding is the layer shear strength. As a design I will post a drop in replacement and a 6mm bore as shown above.

Some of the shear issue can be helped with the use of PETG (in my case as I don't currently run nylon or ABS) and raising the perimeter shells and infill. Below is 6 perimeters and 40% infill. The area will remain the weak point without the bolt running full length. The infill could be pumped up which will help a bit but it becomes the law of diminishing returns as it is still a point load at the head of the screw.

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #48 on: March 14, 2019, 03:01:51 am »
Literally 5 minutes work.

Strongly suggest you run the bolt nearly full length to avoid layer shear. If the screw is to stay at 3.5mm then running a tube outside of that will help a lot so 3.5x5 or 6mm? Personally I would look and see if the chassis can be drilled and tapped to maybe 6mm?

The Foot outer I have made 31mm Square so a 5mm lip, partly it will give better stability when sitting on the feet but also would allow cable wrapping. The lower square is 21mm BTW

Simple print job when finished and I will send you a couple of sets over to play with.  :)
Yeah they could be improved some however without cord slots they should be stronger.
I've allowed for 5 mm screw thread engagement with the standard screw that while this 1740 I have here has zero feet all the screws are there.  ::)
While I could put bigger screws in most that own these would just want a drop in replacement so it's a shame we haven't got the original length so ppls could just print one or two to suit their immediate needs.
Thought you'd add a lip.  ;)

Thanks again, that's very kind or you but these are a commonly missing/broken part and I was just trying to add to the great future resource you're building.
Only got one unit here and not likely to be chasing another as this was a freebie I'be had for some years and still haven't got around to fixing.  ::)
One set will be fine.  :)

Extruding down to the lower level of 13.5mm is easy as is dropping back to the 3.5mm hole (3D print cross sections shown done below). The major difference with 3D printing over injection or rubber molding is the layer shear strength. As a design I will post a drop in replacement and a 6mm bore as shown above.

Some of the shear issue can be helped with the use of PETG (in my case as I don't currently run nylon or ABS) and raising the perimeter shells and infill. Below is 6 perimeters and 40% infill. The area will remain the weak point without the bolt running full length. The infill could be pumped up which will help a bit but it becomes the law of diminishing returns as it is still a point load at the head of the screw.
Understood and still reminding you the feet should provide full insulation so any metal fixings needs be recessed some.

BTW, we might be best for someone that has a HP1740 to chime in with the correct length for the feet.
« Last Edit: March 14, 2019, 03:19:24 am by tautech »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #49 on: March 14, 2019, 03:07:14 am »
HP Knob Onesie to suit 1/4" shafts.

Modded the CAD file back to a single piece version to suit 1/4" Bore and approximately 14mm long round shafts. As shown I looked at running 2x3mm knurl nuts for the grubscrews but they are to long even at 3mm to be made work. The working version uses a 3D printed 3mm thread which turned out reasonably well formed at 0.1mm layer height. I don't have any grubscrews currently is the reason for normal ones shown. Also YES the bore is deliberately very tight on the shaft to minimise the work the grubscrews need to do.

Printing details as per the 3 piece version a few posts ago. 0.1mm layer no detection of thin walls etc.

What I would suggest to make it work better is sharpen a point on the 3mm grubscrew to bite into the shaft to allow a little less screw tension (don't strip the thread) and to then apply a drop of thin CA glue to the head of the grubscrew when in the correct position which should wick down the thread/knob interface and help it stay with less chance of it stripping.

Cad and STL in a Zip file at the Google Drive Link https://drive.google.com/open?id=1DrCOmr-j3UumHvSVMzbPccIYiV4O_ox6
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #50 on: March 14, 2019, 03:09:05 am »
You can fairly easily buy Flat Head Rivets in all sorts of lengths and diameters if you want to keep it more like the original. Try a Google search for "3mm flat head aluminium rivets" The 3x5mm collar and spring should be easy to sort out.

The few older Nixie Counters I have with those feet came with all attached  ;D But keep on with the design  :-+

Oh cool, I'll check those rivets out.

I have a few bits of gear that need these feet (There seems to be a test equipment foot fairy here in Japan that is stealing all the feet from the second hand equipment listed online....) and with how hard these seem to be to find online, I know I'll be printing a few for myself. :)
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #51 on: March 14, 2019, 03:14:15 am »

Understood and still reminding you the feet should provide full insulation so any metal fixings needs be recessed some.

Version one with the 6mm full length still allowed for 6mm recess and 12mm OD head. The hardware 6mm ugly below is 4mm x 12mm so it should be easy to get one for a long bolt option.Bumped the diameter of the recess to 12.5mm. 2mm clearance should be ok to 1000V+
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #52 on: March 14, 2019, 03:34:55 am »
Foot - Generic replacement for HP 5040-7829 cord wrap foot, fits HP174* CRO's.

40mm Long generic  foot as shown. Two STL's in the Zip a high strength 6mmx34mm depth and a drop in HP hardware replacement for 3.5x13.5mm screws on the scope. Also included is the Fusion 360 Cad file for others to play with.

Suggested 3D printer settings 6 top, bottom and side perimeters and 40% infill. Material choice minimum PETG or better Nylon if you can. 0.2mm Layers and support on the build plate only to keep the recessed hole looking nice.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #53 on: March 14, 2019, 04:27:53 am »
I printed the HP knob to check it out; this is how it works out for me.  I printed it with the top down to avoid filling it with supports.  This is with a 0.1 layer height, PLA with a 0.4mm nozzle.  I didn't spend any time cleaning it up, just pulled off the skirt and removed a few wisps.



It would work great as a knob, it's just the knurling looks a little haphazard and feels a bit rough.  Maybe replace it with a smooth recessed grip area (basically remove the ridges) and slip a rubber or plastic sleeve over it.  And, replace all knobs for uniformity.
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #54 on: March 14, 2019, 04:37:24 am »
Did you look at the Gcode on your slicer before printing? Switching off the 'detect thin wall' sorted mine out a lot on the flutes and they came out much cleaner.

Printed the other way up with no supports the alignment slots work fine due to the curved tops and the just the top of the main chamber finishes up a little fury until it bridges properly. This could be fixed by adding a 450 chamfer to the roof but it will likely require a shorter shaft or stick out further from it.

For a more generic knob cutting back the flutes to 12-15 would sort a lot of issues but then it wouldn't be a HP clone.

Interesting to see other printers results  :-+
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #55 on: March 14, 2019, 06:05:53 am »

Understood and still reminding you the feet should provide full insulation so any metal fixings needs be recessed some.

BTW, we might be best for someone that has a HP1740 to chime in with the correct length for the feet.

So my design guess was WRONG it seems the real deal only had a lip on the outside ;) From here http://hpmemoryproject.org/an/pdf/sf_1700.pdf

Let me know if you want the design shortened to the 1 3/8" and I will tweak it, what isn't shown is if it is measured from the case or rear fascia so 40mm is safe. I think for strength keeping the more blocky 3D printed  version is sensible pending anyone having better images or one to measure from?

« Last Edit: March 14, 2019, 06:07:51 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #56 on: March 14, 2019, 10:29:11 am »

Understood and still reminding you the feet should provide full insulation so any metal fixings needs be recessed some.

BTW, we might be best for someone that has a HP1740 to chime in with the correct length for the feet.

So my design guess was WRONG it seems the real deal only had a lip on the outside ;) From here http://hpmemoryproject.org/an/pdf/sf_1700.pdf

Let me know if you want the design shortened to the 1 3/8" and I will tweak it, what isn't shown is if it is measured from the case or rear fascia so 40mm is safe. I think for strength keeping the more blocky 3D printed  version is sensible pending anyone having better images or one to measure from?
:clap:
Good find and checked the 1 3/8" (~35 mm) which seems perfect with ~4 mm clearance from the CRT cover to ground.(excluding any fascia height measurement)
IMO ~35 mm is the height we want to work with in this metric day and age.  :-+
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #57 on: March 14, 2019, 10:38:14 am »
Looking at the bad photo I am actually wondering if they were made from the same soft plastic on the 5300's I made new feet for rather than a rubber. What was left of mine basically crumbled into pieces and the rear shot of Daves looks like that same sort of issue?

Edit Adding the 35mm Foot here due to the 1Mb file size limit   |O I will add it to the link index on the front page and leave both available.

Modded Fusion file and both STL'in the Zip for 6mm Long Screw and the Genuine HP screw options.
« Last Edit: March 14, 2019, 11:06:54 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #58 on: March 14, 2019, 10:52:33 am »
Looking at the bad photo I am actually wondering if they were made from the same soft plastic on the 5300's I made new feet for rather than a rubber. What was left of mine basically crumbled into pieces and the rear shot of Daves looks like that same sort of issue?
My memory thinks hard rubber but they may have been some soft crumbly plastic IDK.
Sorry I don't have a sample to do some chemical or heat tests on.  :(

Use your bestest judgement.  ;)
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #59 on: March 14, 2019, 11:19:02 am »
Some time ago I made a power/input switch button cap for HP3478A. You may like to add it. There are STL and OpenSCAD models in there.
https://www.eevblog.com/forum/testgear/list-your-test-equipment-score-here!/msg1255227/#msg1255227

Edit: can't fix the url to make it clickable
« Last Edit: March 14, 2019, 02:55:50 pm by kirill_ka »
 
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #60 on: March 14, 2019, 11:43:36 am »
Odd.. found a file for a Wavepro/wavemaster bezel some time ago but the page is gone. I still have the files if anyone wants them but I guess there's a reason why it was redrawn so I'd rather not upload the files here...

Those who ever serviced one of those know why you'd want a replacement bezel   :-DD I actually considered having one 3D printed and perhaps order a small batch injection molded if the file was OK. If there's ever enough interest for that I may still attempt it...
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #61 on: March 14, 2019, 12:07:56 pm »
Some time ago I made a power/input switch button cap for HP3478A. You may like to add it. There are STL and OpenSCAD models in there.
https://www.eevblog.com/forum/testgear/list-your-test-equipment-score-here!/msg1255227/#msg1255227

Edit: can't fix the url to make it clickable

Added it on the front page index here. SMF doesn't like the ! unless you put it inside the URL tags.  :-+

Odd.. found a file for a Wavepro/wavemaster bezel some time ago but the page is gone. I still have the files if anyone wants them but I guess there's a reason why it was redrawn so I'd rather not upload the files here...

Those who ever serviced one of those know why you'd want a replacement bezel   :-DD I actually considered having one 3D printed and perhaps order a small batch injection molded if the file was OK. If there's ever enough interest for that I may still attempt it...

Interesting it still turns up on the Yeggi search and you can view the page via a google archive but the file has been stripped for 'reasons' so it must have only been recently removed :-//
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #62 on: March 15, 2019, 01:59:07 am »
Did you look at the Gcode on your slicer before printing? Switching off the 'detect thin wall' sorted mine out a lot on the flutes and they came out much cleaner.

Printed the other way up with no supports the alignment slots work fine due to the curved tops and the just the top of the main chamber finishes up a little fury until it bridges properly. This could be fixed by adding a 450 chamfer to the roof but it will likely require a shorter shaft or stick out further from it.

For a more generic knob cutting back the flutes to 12-15 would sort a lot of issues but then it wouldn't be a HP clone.

Interesting to see other printers results  :-+
By G-code, do you mean the actual .gcode or the layer breakdown?

I'm in the middle of switching from Cura to Simplify3D, and am experimenting with thin wall settings to see what I can come up with.  The HP knob is a pretty good, practical test case!
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #63 on: March 15, 2019, 02:13:16 am »
The issue you're seeing may be printer settings.  If it's doing the perimeter of the knob on each layer with a continuous outer path, then it could be excessive acceleration/jerk settings or maybe turn up the extrusion multiplier.  If the perimeter is printed inside and then the ridges are added in separate little segments, it's probably an extruder (likely retraction) issue.  I suspect the latter, but if your extruder is having to pick up and put down filament in each ridge, sometimes the amount it retracts and replaces is not consistent all the time, so you're getting these artifacts.  If that's the case, try slowing retraction speeds or looking around other forums for retraction tuning tips.
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #64 on: March 15, 2019, 02:15:09 am »
In Sli3er for example after you slice the print you can look at a 3D preview of the print. I use this in most cases before starting longer prints. Go back to the last page and you will see the spaghetti version when reviewed with 'detect thin walls' on. https://www.eevblog.com/forum/testgear/replacement-knobs-feet-and-fittings-for-test-equipment/msg2257833/#msg2257833

Just for fun here is a 6 layer 40% infill in PLA of the 35mm Foot printed on the Ender Pro. My CR-10 with the glass Bed is where I will print the PETG ones for @Tautech is partially stripped down while I put it into an enclosure.

Sheared as expected at the screw head but even in PLA took a fairly severe whack to get that to happen, I would hope most of us don't treat our gear like that  ;) . PETG will give it more layer strength and a little more flex which will help it soak up some more punishment. The oposite end of the hammer is actually a PETG insert I made over a month ago and is holding up well unlike the PLA sample one which failed quickly.

https://youtu.be/H0vTK5Li-NQ
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #65 on: March 15, 2019, 02:56:01 am »
Holy hell Bean, that took a whack before it broke.  :o
Should be more than strong enough IMHO.  :-+
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #66 on: March 15, 2019, 03:13:30 am »
I did some similar strength tests on LeCroy scope feet I was printing, and tested a couple materials as well as a few different layer alignments (printed the model on its side, for example).  I was primarily looking at PLA and ABS, but PETG can be sort of inferred from it.

The PLA parts were harder, slightly heavier, and more resistant to small impacts (I tried both sides of the hammer), but when they failed they were likely to shatter if not chip in a large way.  The ABS parts showed visible damage with lighter swings, but held together much better with big damage - never entirely shattering a part.  PETG is a bit closer to ABS in consistency, but is somewhat between the two, and it's supposed to be pretty chemical resistant, so it would be a good choice for a lot of the external plastics on an instrument.  The advantage ABS has is that it's a bit easier to work (paint, glue, etc), and that it's cheaper, often close to half the price of PETG.

In any case, though, if you're at or above 25% infill and the model is made well, odds are good you're going to have a durable part in almost every plastic.  It's not until you need really high impact resistance or supporting a lot of weight that high infill percentages or specialized materials are really necessary.  Rather than strength, I think the primary issue with PLA is just that it will deform when near heat, so it's probably not a good choice for internal components in areas that get warm.
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #67 on: March 15, 2019, 03:36:37 am »
I have got to like PETG and given the downsides of Printing ABS I am not that likely to adopt it in my on hand materials.

Some interesting work by Stefan @ CNCKitchen on Annealing PLA and much more controlled strength tests of various materials here for those who haven't seen them https://www.youtube.com/channel/UCiczXOhGpvoQGhOL16EZiTg It still doesn't fix the moisture issue in wet applications compared to ABS or PETG but interesting work.

Horizontal feet would cause a different set of problems with easier shearing of the fins and splitting lengthwise at the screw head with a blow like I gave my vertical one. Pros and cons of both. My preference would still be to go the long bolt vertical option to aid the layer adhesion but it seems to be up to the task unless you are a Rough as Guts NZ Sheep Farmer  >:D
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #68 on: March 15, 2019, 04:38:38 am »
I have got to like PETG and given the downsides of Printing ABS I am not that likely to adopt it in my on hand materials.

Some interesting work by Stefan @ CNCKitchen on Annealing PLA and much more controlled strength tests of various materials here for those who haven't seen them https://www.youtube.com/channel/UCiczXOhGpvoQGhOL16EZiTg It still doesn't fix the moisture issue in wet applications compared to ABS or PETG but interesting work.

Horizontal feet would cause a different set of problems with easier shearing of the fins and splitting lengthwise at the screw head with a blow like I gave my vertical one. Pros and cons of both. My preference would still be to go the long bolt vertical option to aid the layer adhesion but it seems to be up to the task unless you are a Rough as Guts NZ Sheep Farmer  >:D
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #69 on: March 15, 2019, 06:15:53 am »
ABS is tougher to print, basically requires an enclosure to get good layer adhesion, especially on large parts.  And yeah, layers stacked up so that the bolt head presses on a complete layer does seem the strongest for that sort of mounting.  The trouble with annealing for this sort of thing is the non-uniform shrinkage.  If you can fully characterize your individual filament, it may be usable by printing effectively size-warped parts, but since the X/Y shrinkage is a different ratio than the Z shrinkage and certain printed structures (internal included) shrink differently, it could be really difficult to get proper sizing for parts that connect to something on more than one side.
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #70 on: March 16, 2019, 12:08:15 am »
I've been cranking out supports like these in various heights to use as equipment spacers.  I can stand on them!  Strong AF.  Just plain PLA, 2mm walls and not much infill (20% I think I used) - the strength is in the walls anyway.  50x50x25 (X Y Z).  I have some non-slip thin adhesive rubber that comes in sheets that I cut to shape and stick on them.  I have some serious boat anchors stacked using these...

I figured if I at 165 lbs can stand on one, then four of these can hold up anything I care to pile up.



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« Last Edit: March 16, 2019, 12:15:13 am by bson »
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #71 on: March 16, 2019, 04:29:58 pm »
I figured if I at 165 lbs can stand on one, then four of these can hold up anything I care to pile up.

There is quite a big difference bewteen compression strength and shear strength (which is what beanflying was testing in his video).
FDM prints are generally pretty good for compression strength, but so-so for shear strength, and awful for tensile strength.
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #72 on: March 17, 2019, 02:05:55 am »
Great in compression strength. I have one of my large commercial Espresso machines (110kg) sitting on 4 PETG 40mm diameter feet and held onto the machine with a single M10 bolt straight into the Plastic.

Layer orientation or even splitting parts for strength is sometimes a necessary evil and certainly a consideration with FDM. Even minimising supports or better yet removing the need for them.

This Creality control box design below of mine prints without supports in spite of the level of detail because of the angle of the case split and then tweaking the internal structures to make them self support (under 450 or extend PCB mount rails to the floor). With a simple vertical split the support requirements would have been horrid.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #73 on: March 17, 2019, 04:31:47 am »
There is quite a big difference bewteen compression strength and shear strength (which is what beanflying was testing in his video).
FDM prints are generally pretty good for compression strength, but so-so for shear strength, and awful for tensile strength.
Ah.  I wasn't referring to the video... haven't watched it.
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #74 on: March 18, 2019, 06:55:53 pm »
Bean, I had a friend print out the HP 3470-series rear foot and Defpom's 3-point snap-in feet (for my 3478A).  They all fit perfectly and with a little pad of adhesive foam on each one, even keep the gear from sliding around. Life is good!
 
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #75 on: March 19, 2019, 10:08:09 pm »
Hi,

Here is my contribution: feet for the HP/Agilent 8590 spectrum analyzer series.

A little background: this series uses rubber feet around the case (front and back). These rubber parts get really worn out with time and in my case, the two units I purchased came without any feet. I think that the previous owner either "forgot" to put them back on or, my suspicion, the devices where installed in some rack or whatever.

Using these devices without the feet is not reasonable, because the metal case around the device has a joint on the lower side. If you put the device flat on a table, it will wobble to the left and right due to this joint.

Also, without the back feet, you cannot place the device in vertical position, for example in case of storage with small footprint.

This means I really needed some feet.

Casually, I am working on a software project that requires to capture 3D points using a Microscribe arm (https://revware.net/products/microscribe-portable-cmm/).

Also, I finally managed to repair an old unit that was a dumpster case and which I luckily brought home with me. The problem was one of encoders was broken, as well as one of the axis counter IC.

Anyway, having a Microscribe and knowing how to use a CAD software, I started the reverse engineering process by digitizing the surface where the feet attach to.

I guided my design through pictures of the HP 8594E, in order to make the front feet look as close to the original as possible and reasonable.

The back feet, however, are considerably different. That is because I actually disliked the original HP design and, also, I had to have print material consumption in mind.

So I designed them a little different, but I think the result is actually pretty good.

I had the feet printed in our office, where we have Markforged printers. I used a Markforged Mark Two with their Onyx material (https://markforged.com/mark-two/). This material is not the toughest of the available materials, but it is still very robust. In fact, it is unbreakable with your bear hands and can compete with aluminium. The only draw-back is the color: this material is only available in black and it is not easy to paint (I tried on a different component).

So the feet on my device are black instead of white-ish.

The surface finishing and overall tolerance is miles away from cheap 100 Euro China-Clone-Printer. Especially if you spend a moment figuring out what is the most favorable position to print each part (I left that to my colleague who operates the printers).

Attached are pictures and an archive with the STL files. Please note that the front feet are made of two different models - you need to print 2 of each. This is obviously because they are mirrored (Up-Left and Down-Right <-> Up-Right and Down-Left). Obvious? Well, I got the first trial wrong and printed 4 of the same kind...

Good luck!

Regards,
Vitor
« Last Edit: March 19, 2019, 10:18:17 pm by Bicurico »
 
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #76 on: March 19, 2019, 10:15:04 pm »
Here is another part:

A button for the encoder on the Rohde&Schwarz CMU2000 and CRTU.

Note that you need a 3D printer cabable of printing walls with 1.3mm thickness! This is needed for the inner core. If you use a cheap printer, it would probably be better to reinforce the inner support structure.

Regards,
Vitor
 
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #77 on: March 20, 2019, 12:13:53 am »
Hi,

Here is my contribution: feet for the HP/Agilent 8590 spectrum analyzer series.

A little background: this series uses rubber feet around the case (front and back). These rubber parts get really worn out with time and in my case, the two units I purchased came without any feet. I think that the previous owner either "forgot" to put them back on or, my suspicion, the devices where installed in some rack or whatever.

Using these devices without the feet is not reasonable, because the metal case around the device has a joint on the lower side. If you put the device flat on a table, it will wobble to the left and right due to this joint.

Also, without the back feet, you cannot place the device in vertical position, for example in case of storage with small footprint.

This means I really needed some feet.

Casually, I am working on a software project that requires to capture 3D points using a Microscribe arm (https://revware.net/products/microscribe-portable-cmm/).

Also, I finally managed to repair an old unit that was a dumpster case and which I luckily brought home with me. The problem was one of encoders was broken, as well as one of the axis counter IC.

Anyway, having a Microscribe and knowing how to use a CAD software, I started the reverse engineering process by digitizing the surface where the feet attach to.

I guided my design through pictures of the HP 8594E, in order to make the front feet look as close to the original as possible and reasonable.

The back feet, however, are considerably different. That is because I actually disliked the original HP design and, also, I had to have print material consumption in mind.

So I designed them a little different, but I think the result is actually pretty good.

I had the feet printed in our office, where we have Markforged printers. I used a Markforged Mark Two with their Onyx material (https://markforged.com/mark-two/). This material is not the toughest of the available materials, but it is still very robust. In fact, it is unbreakable with your bear hands and can compete with aluminium. The only draw-back is the color: this material is only available in black and it is not easy to paint (I tried on a different component).

So the feet on my device are black instead of white-ish.

The surface finishing and overall tolerance is miles away from cheap 100 Euro China-Clone-Printer. Especially if you spend a moment figuring out what is the most favorable position to print each part (I left that to my colleague who operates the printers).

Attached are pictures and an archive with the STL files. Please note that the front feet are made of two different models - you need to print 2 of each. This is obviously because they are mirrored (Up-Left and Down-Right <-> Up-Right and Down-Left). Obvious? Well, I got the first trial wrong and printed 4 of the same kind...

Good luck!

Regards,
Vitor

Thanks for the models added to the index post.  :) Interesting project with the Microscribe and very nice prints off the Markforge and Onyx Filament too :-+

I got a couple of rolls of PLA+ I have been going to try and see if they produce anything noticeably better unfortunately any of the branded fancy filaments tend to cost way to much by the time we get them in Australia.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #78 on: March 21, 2019, 07:28:09 pm »
regarding those rear feet, this photo of a HP 3581A I found may come in handy.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #79 on: March 21, 2019, 09:05:53 pm »
Hi,

While the feet of your device are completely different from the feet used on the HP 8590 series, they show one of the reasons I decided to redesign them.

Notice that the screws have to be extra long! I made the feet, so that a much shorter screw can be used. Also, the feet go around the edge, securing the case (which the original 8590 feet already did, too).

Regards,
Vitor

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #80 on: March 21, 2019, 11:08:30 pm »
Hi,

While the feet of your device are completely different from the feet used on the HP 8590 series, they show one of the reasons I decided to redesign them.

Notice that the screws have to be extra long! I made the feet, so that a much shorter screw can be used. Also, the feet go around the edge, securing the case (which the original 8590 feet already did, too).

Regards,
Vitor

Those feet are in reference to an older model Hewlett Packard Scope I guessed/designed some feet for a few days ago (one page back) :)

regarding those rear feet, this photo of a HP 3581A I found may come in handy.

Interesting seems that model has a long bolt unlike Tautech's earlier one. The Square top seems close to what I guessed for Tautechs and the Zipped STL's have a short and a long bolt option so with luck it should suit the HP 3581A too. The only difference seems to be a taper on the leg.
« Last Edit: March 22, 2019, 03:52:38 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #81 on: March 22, 2019, 12:35:01 am »
Great thread.  This is a sticky candidate.
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #82 on: March 22, 2019, 04:37:06 am »
Thanks for sharing some of my replacement part designs.

I have a couple more bits which I didn't see listed (I could have just missed them).

Lever for HP PCB daughter boards: https://www.thingiverse.com/thing:2909930
Valhalla 2703 (and 2705) Front Handle: https://www.thingiverse.com/thing:2910473

I make new items as I come across things I need to repair, so the list gets added to as the need arrises.
« Last Edit: March 22, 2019, 04:44:15 am by TheDefpom »
 
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #83 on: March 22, 2019, 04:41:50 am »
Thanks for sharing some of my replacement part designs.

I have a few a couple more bits which I didn't see listed (I could have just missed them).

Lever for HP PCB daughter boards: https://www.thingiverse.com/thing:2909930
Valhalla 2703 (and 2705) Front Handle: https://www.thingiverse.com/thing:2910473

I make new items as I come across things I need to repair, so the list gets added to as the need arrises.

Thanks for jumping in.  :) I haven't gone over Thingiverse is a systematic search yet it's on the 'list'  :palm: I will add your couple of extras on the index.

BTW How is your 2703 going now? I scored a really nicely working one unlike your problem child.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #84 on: March 22, 2019, 04:47:30 am »
BTW How is your 2703 going now? I scored a really nicely working one unlike your problem child.
It was OK the last time I used it, I need to do a calibration on it, haven't done that yet, but I picked up a Fluke 540B thermal transfer standard (which I also had to repair) so that I can calibrate it with my Fluke 341A DC calibrator (which I also repaired).

I will do a video on it eventually!

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #85 on: March 22, 2019, 04:59:52 am »
It was OK the last time I used it, I need to do a calibration on it, haven't done that yet, but I picked up a Fluke 540B thermal transfer standard (which I also had to repair) so that I can calibrate it with my Fluke 341A DC calibrator (which I also repaired).

I will do a video on it eventually!

I know that rabbit hole well. Buy another bit to Calibrate the first bit :-DD I have both of my Agilent 6 1/2 digits on their way to Keysight for Calibration at present, when they get home the entire fleet gets a proper going over and Tweak against the pair :-/O
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #86 on: March 22, 2019, 06:57:28 pm »
Base part for vertical gain knob for SC 504 Oscilloscope

https://grabcad.com/library/vertical-gain-knob-for-tek-sc504-1

The files are too large to post here.

Printing this was a long exercise as the photo shows.  On the left was an attempt to mold the part.  No go with deep thin walls.  The key settings as I remember were Cura Fine print settings for base, with 92% density (supposedly optimum for strength), used PLA+ at print temp of 210C.  The disk on the end was required to get adequate base adhesion and is sanded off or otherwise removed.
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #87 on: March 23, 2019, 12:32:24 am »
Base part for vertical gain knob for SC 504 Oscilloscope

https://grabcad.com/library/vertical-gain-knob-for-tek-sc504-1

The files are too large to post here.

Printing this was a long exercise as the photo shows.  On the left was an attempt to mold the part.  No go with deep thin walls.  The key settings as I remember were Cura Fine print settings for base, with 92% density (supposedly optimum for strength), used PLA+ at print temp of 210C.  The disk on the end was required to get adequate base adhesion and is sanded off or otherwise removed.

Frustrating beast to get right. Some of these more fiddly ones like this and the HP knobs seem like ideal candidates for non FDM printing even if they were outsourced to a service might get a stronger more detailed result. I keep denying myself a Resin printer but if the raw material prices come down I might add one to the fleet.

Shame you need to sign your life over to Stratasys to download the files too  :-X
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #88 on: March 25, 2019, 03:06:05 am »
Odd.. found a file for a Wavepro/wavemaster bezel some time ago but the page is gone. I still have the files if anyone wants them but I guess there's a reason why it was redrawn so I'd rather not upload the files here...

Those who ever serviced one of those know why you'd want a replacement bezel   :-DD I actually considered having one 3D printed and perhaps order a small batch injection molded if the file was OK. If there's ever enough interest for that I may still attempt it...

Was doing some site searches here for any other lost designs and came across the owner of the missing design from Thingiverse  :-// https://www.eevblog.com/forum/testgear/restoration-of-lecroy-wavemaster-wavepro-front-bezel-by-3d-printing/msg2217930/#msg2217930

Even with the files removed for whatever Mechatrommer's reasons were the thread is worth a read.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #89 on: April 04, 2019, 02:58:28 am »
It is not too hard or expensive to find the HP snap in feet used on a wide variety of small instruments including the 3468B multimeter, but it is was a fun challenge to model and print.  There are a number of functionally equivalent model numbers (at least as far as I can tell).  5040-7201, 5040-7222, 5041-8801 and 5041-9167 are ones I am aware of.

This is not an exact copy of any of them.  Changes were made to suit 3D printing and to make it easier to model.  Also the instructions molded into the foot were omitted.

Sliced with Cura, best printed feet down, 85-90% fill, with gyroid infill pattern, and zig-zag supports everywhere.  I used PLA+ filament at 210C and bed temp of 50C.  Any elephant footing will kill the ability to fit mounting holes, so if you have some trim or sand it down.

HP 5041-7201 is and .stl file, renamed to meet forum naming restrictions.  Change the extension to stl and it is ready to use.
« Last Edit: April 04, 2019, 03:31:05 pm by CatalinaWOW »
 
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Offline texaspyro

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #90 on: April 04, 2019, 03:20:18 am »
HP feet are easy to find since somebodu in China tooled up to make them...  the tilt bails, no so easy... at least the last time that I looked.
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #91 on: April 04, 2019, 03:33:36 am »
The tilt bails are easy to make.  I did a couple today.  All it takes is a vise, a crescent wrench and a pair of pliers.  Which also means it is easy to make them different lengths which is good for different uses.
« Last Edit: April 04, 2019, 03:35:35 am by CatalinaWOW »
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #92 on: April 04, 2019, 08:45:21 am »
HP feet are easy to find since somebodu in China tooled up to make them...  the tilt bails, no so easy... at least the last time that I looked.

While you can buy some of them once the design is done and proven to work anyone can print a foot for under $1 and generally under an hours time.

On my list of projects will be feet for my 419A which will also suit a bunch more similar aged HP small format Gear (including my 735A currently sitting on self adhesive rubber). Also missing is the lower and side panels and tossing around Laser engraved smoke grey sides and either a printed or getting an aluminium lower one made.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #93 on: April 04, 2019, 03:00:11 pm »
On the subject of the 419A, how about the little plastic thingummywidgets that take a PK screw and clip into a chassis hole, used to insulate Guard from Ground? My instrument is short a few, and hence not so well assembled as it used to be!
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #94 on: April 04, 2019, 04:11:48 pm »
On the subject of the 419A, how about the little plastic thingummywidgets that take a PK screw and clip into a chassis hole, used to insulate Guard from Ground? My instrument is short a few, and hence not so well assembled as it used to be!

Won't take much to model so I will take a look when I do the feet and panels.

Interesting video on dielectric breakdown of PLA prints if anyone is interested.

https://youtu.be/ZqXQRq8As1o
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #95 on: April 08, 2019, 05:14:04 am »
I worked on a similar (but simpler) push-on knob for the E36xxA (E3610A, E3620A, E3630A etc.) power supplies. These are friction fit, so take a little finessing on the sizing. Knurling on my prints is a little rough, but not so objectionable; I think I need better quality PLA. Here it is: https://www.thingiverse.com/thing:3546393
« Last Edit: April 08, 2019, 05:15:48 am by JohnPi »
 
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #96 on: April 16, 2019, 06:54:05 am »
Just finalising a foot design for some of the smaller HP instruments. The one shown will suit nominal 5 1/8" wide case (735A, 327A and others) and I will be tweaking a version for the 7 3/4" wider case (419A and others).

I was going to do a version of the push in tool less clip but I have decided to go down the path of a 5mm knurl nut and button head screw. There is sufficient clearance of the head due to the design of these feet unlike the edge type feet of the same era. With the fairly tight tolerance I have used on the clip in parts it really isn't needed anyway.

For best strength on the clips it needs to be printer on it's side so as circled I have tweaked a surface with a 45 degree chamfer to reduce the supports needed.

Full Sample one is on the printer and everything being ok I will add it here later today.
I will still have a play with a rivet version and see if I can get it right too.

Edit: Off the printer and it works. Just needs a few subtle tweaks to make it work better on the printer.  :) Added a photo of the sample installed.

« Last Edit: April 16, 2019, 08:23:19 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #97 on: April 16, 2019, 08:46:44 am »
I'm liking this thread.

I worked on a similar (but simpler) push-on knob for the E36xxA (E3610A, E3620A, E3630A etc.) power supplies. These are friction fit, so take a little finessing on the sizing. Knurling on my prints is a little rough, but not so objectionable; I think I need better quality PLA. Here it is: https://www.thingiverse.com/thing:3546393

Just a heads up - keysight still sell those and they are probably cheaper than printing them! Think I paid less than $1 each for them last time.

@beanflying: feet on my 400E are identical to your 427A for ref.
« Last Edit: April 16, 2019, 08:50:23 am by bd139 »
 
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #98 on: April 16, 2019, 09:29:39 am »
I like this thread too

Nice work  for the 3d printed parts, i wish i could do that  loll   no experience at all

I would love to do 2 very old buttons , they have around 2 inches long shafts, for an 57 years old Phillips vintage tube radio from my father
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #99 on: April 16, 2019, 09:35:39 am »
I like this thread too

Nice work  for the 3d printed parts, i wish i could do that  loll   no experience at all

I would love to do 2 very old buttons , they have around 2 inches long shafts, for an 57 years old Phillips vintage tube radio from my father

If you still have one then epoxy is an option. Check out some of these linked youtube videos https://www.eevblog.com/forum/testgear/replacement-knobs-feet-and-fittings-for-test-equipment/msg2255121/#msg2255121

Or

If you were really keen then sharpen up some CAD skills and draw them up and get them made by one of us mob or an online 3DP source.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #100 on: April 16, 2019, 04:19:35 pm »
Yep, there are a few good free options for CAD software and while it will take a couple weeks to get a really good feel for manipulating things and remembering where all the right tools are and such.... it's not a process that's too bad to learn.  Especially if you're familiar with mechanical drawings and how those translate into physical parts, you basically start by making a drawing in a program an then expand it out into 3d space, but you can make a drawing of every major side and manipulate the 3d model to line up with it perfectly.  A bit time consuming to learn, but powerful and fairly intuitive if you're familiar with this kind of thing.

It is nice to have the printer yourself so you can test fit and make minor adjustments quickly, though.
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #101 on: April 17, 2019, 12:53:13 am »

It is nice to have the printer yourself so you can test fit and make minor adjustments quickly, though.

Yep V3 Foot is a winner but there is still a tweak needed so V4 coming up. I want to reduce the width of the angled sections where the bail slides along to lock in position. At the standard width and on the genuine part the foot flexes a lot and is most likely why a lot of them failed. 0.8mm a side should do it.  ;)

Second tweak for others wanting to make this I am going to drop the knurl nut from the design as 5mm is a bit of an odd one to keep and just under size the hole to 4.8mm for the 5mm lock screw. With PLA the screw will tap itself in even if you don't own a 5mm tap to do it nicely.

Underside of my 735A Transfer Standard. I will use my pair of genuine one on the rear of it and the 427A as they are under less stress.

Edit: Photo added still has clearance under the screw head even with the feet sitting in the slot of the 6632B fascia.
« Last Edit: April 17, 2019, 01:36:33 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #102 on: April 17, 2019, 05:14:06 am »
Awesome work, bean! The only narrow-body gear I have is a 3469B. Everything else is in the 7-3/4" enclosures. I've been fortunate to have gotten feet on all but one of them, but their longevity is certainly a concern with the tilting bail. So, I just leave them stacked.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #103 on: April 17, 2019, 01:03:26 pm »
Just about got the two sorted out for others to play with. First of the 7 3/4" ones. My 419A need a bottom and side plates making for it so I will fire up the Laser for the sheet parts at this stage. Narrow 427A floor just to keep the bits in place.

Seems the alignment of the longer feet to bail is different by a touch so the foot needs to come forward by 1/16" so the bail sits more vertically? Tomorrow job 11pm, Beans are roasted and my Brain is scrambled.

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #104 on: April 18, 2019, 09:21:34 am »
7 3/4" Case Hewlett Packard formerly push button foot to Suit Late 60's and 70's gear.

Sorted and fairly happy with the result. Included in the zip file is the Fusion Cad file and STL for the print. As discussed in the preceding few posts the design requires a 5x10mm (may be ok with longer but check) Button Head screw instead of the more complex rivet and spring original.

Print it as you see it in the STL on edge to ensure the clips have maximum strength. I got the best results using the following on an Ender Pro and sli3er PE.

0.12mm Layer height, 6 top, bottom and perimeters, 40% infill. It will need to be printed with supports and may take a tweak depending on your slicer and printer but I dropped the overhang threshold to 40 degrees (works ok with 0.12mm layer), no support for bridges and 3 interface layers to make separating the material minimal.

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #105 on: April 18, 2019, 09:30:38 am »
Looks excellent  :-+
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #106 on: April 18, 2019, 09:32:50 am »
4 1/8" Case Hewlett Packard formerly push button foot to Suit Late 60's and 70's gear.

Sorted and fairly happy with the result. Included in the zip file is the Fusion Cad file and STL for the print. As discussed in the preceding few posts the design requires a 5x10mm (may be ok with longer but check) Button Head screw instead of the more complex rivet and spring original.

Print it as you see it in the STL on edge to ensure the clips have maximum strength. I got the best results using the following on an Ender Pro and sli3er PE.

0.12mm Layer height, 6 top, bottom and perimeters, 40% infill. It will need to be printed with supports and may take a tweak depending on your slicer and printer but I dropped the overhang threshold to 40 degrees (works ok with 0.12mm layer), no support for bridges and 3 interface layers to make separating the material minimal.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #107 on: April 18, 2019, 01:44:02 pm »
Tektronix 453 Rear Cable Wrap Feet.

I recently got one of these with a mixed bag of damaged rear feet. The bottom feet on the 453 will get the treatment in the next day or two. No idea what other Tek's this fits so let me know?

Same procedure as other Cad and the two STL's are in the Zip File. It would be easy to mod if you are missing the rear lugs and needed to use a longer bolt. instead of the stud and screw. The Cap fits into the stock base if that is all you need to make.
« Last Edit: April 18, 2019, 02:07:40 pm by beanflying »
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Offline PedroDaGr8

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #108 on: April 18, 2019, 09:35:21 pm »
7 3/4" Case Hewlett Packard formerly push button foot to Suit Late 60's and 70's gear.

Sorted and fairly happy with the result. Included in the zip file is the Fusion Cad file and STL for the print. As discussed in the preceding few posts the design requires a 5x10mm (may be ok with longer but check) Button Head screw instead of the more complex rivet and spring original.

Print it as you see it in the STL on edge to ensure the clips have maximum strength. I got the best results using the following on an Ender Pro and sli3er PE.

0.12mm Layer height, 6 top, bottom and perimeters, 40% infill. It will need to be printed with supports and may take a tweak depending on your slicer and printer but I dropped the overhang threshold to 40 degrees (works ok with 0.12mm layer), no support for bridges and 3 interface layers to make separating the material minimal.

This is AWESOME, these feet are literally impossible to find.

The HP part number for the shorter  5 1/8" foot was 5060-0727, while the part number for the wider 7 3/4" foot in cases was 5060-0728
« Last Edit: April 18, 2019, 09:45:52 pm by PedroDaGr8 »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #109 on: April 18, 2019, 09:48:30 pm »
Bean, you're just awesome at these. I will have to start calling you Dr. Bean, Test Equipment Podiatrist. :-DD
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #110 on: April 19, 2019, 01:05:01 am »
Thanks Guys :)

Some are easy like the Tek Feet as you have one mechanical constraint to work around. The HP click in foot was a bit of a pain as it relies on several mechanical points at odd fine angles and tight tolerances for it to work. If you load up the Cad file you will get an idea. The lower feet are going to be a bit of a guess for shape but so long as it fits the hardware and the holes on the cart will be fine.

The nice bit is when it all works and you get to show off your morning glory  ;D
« Last Edit: April 19, 2019, 03:18:18 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #111 on: April 19, 2019, 03:17:05 am »
Tektronix 453 Lower Feet

As per the previous post the lower feet on mine needed replacing. I have treated these like a knurl nut used in some of my other 3D models and slightly squeeze fitted the inner Hex with a small step to make alignment easier.

Print is easy but keep it heavy at 6 layers and 40% infill. It will be fine at 0.2 but I went with 0.12mm layers again. Insertion temperature with the iron was 230C for PLA but you may need more or less depending on your material choice. Give it time to heat properly and only use moderate pressure, if it seems to high raise the Temp. Added a couple more shots to the preceeding post due to the 1Mb upload limit  |O

3 more to go  :)
« Last Edit: April 19, 2019, 03:18:55 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #112 on: April 29, 2019, 08:05:40 am »
One wheel foot on my waggon HP1740A

@beanflying or others, there is one, last (just) intact foot on my HP1740A scope. I have taken some pictures, and made a few measurements - though as you can see the foot is not exactly in its original condition.

Overall length (as photo) 36.9 mm. The foot end of the foot is 9.5mm thick and 22.0 mm square, the hole for the screw head is 7.8 mm diameter and 23.7mm deep (to the surface of the washer, which didn't want to come out). The 'scope end of the foot is 21.2 mm square and 3.4 mm thick. The two flanges are each 2.1 mm thick. The spacings from the flat surface next the scope chassis to the more distant face of each flange are 11.7 mm & 20.9 mm.

As you can see there is a little 'pip' on the 'scope face of each flange to help retain the mains cable.
 
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #113 on: April 29, 2019, 08:07:01 am »
A couple more pictures. If you need any further measurements, just ask!
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #114 on: April 29, 2019, 08:31:59 am »
I find it funny the 1740 uses a cord wrap foot when it's at all not needed as these scopes have an IEC socketed mains lead. 
Plus there's a wopping great leads pouch in which to store the mains cable. :-//

A new 3DP design is a fine chance to improve on the foot HP shipped with these scopes.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #115 on: April 29, 2019, 08:37:57 am »
Totally agree. It's even worse for us in the UK as the plug is so damn big there's nowhere to put it. Cue scope rocking on top of a mains plug.

Philips had the right idea on the PM33xx scopes as they added little plastic two/three pin holes in the rear of the case so you could plug the plug into the back of the scope to keep it out of the way. However they screwed up as the cord winder plastic broke off instantly the moment you wrapped the first cable around it or the cable was at the wrong length so you couldn't actually wind it around without it falling off :palm:

And if they did ever leave space for a right angled IEC socket it was almost 100% certain that the IEC lead you had pointed the wrong way and couldn't be inserted  |O
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #116 on: April 29, 2019, 08:46:10 am »
Even my Korean Protek has thin cord wrap feet with an IEC so maybe a scope defacto standard over time and it gives the ability to float the scope easier?

I will have a look at drawing a clone for the 1740 et al if people are keen but given the short screw and thinner nature of them it is asking for them to shear off again. While it is most likely the plastic used that failed the chunkier one I designed is the more practical.

The recent Tek 453 I did was different in that it had a stud running nearly full depth and some of the main bits were still ok so I went clone instead of fatter and  practical mainly so I could just print the tops caps needed.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #117 on: April 29, 2019, 08:56:44 am »
Even my Korean Protek has thin cord wrap feet with an IEC so maybe a scope defacto standard over time and it gives the ability to float the scope easier?
Yes I guess that was their thinking at the time however who'd want to float a scope at say 400V and with 35mm of foot length and adding speed bumps cord wrap ribs does effectively lessen any creepage risk but these days we don't have to go overboard due to the filaments we have for 3D printing compared to the hard rubbery foot HP originally used.
Last 1740 I had I made feet from hollowed out bits of wooden broom handle.  :horse:
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #118 on: April 29, 2019, 09:21:46 am »
Totally agree. It's even worse for us in the UK as the plug is so damn big there's nowhere to put it. Cue scope rocking on top of a mains plug.

Philips had the right idea on the PM33xx scopes as they added little plastic two/three pin holes in the rear of the case so you could plug the plug into the back of the scope to keep it out of the way. However they screwed up as the cord winder plastic broke off instantly the moment you wrapped the first cable around it or the cable was at the wrong length so you couldn't actually wind it around without it falling off :palm:

And if they did ever leave space for a right angled IEC socket it was almost 100% certain that the IEC lead you had pointed the wrong way and couldn't be inserted  |O

 I have a Hameg HM605 which has the moulded-in 13A dummy socket, too. Those scopes are actually very nice, and almost completely repairable - no custom ICs or hybrids.
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #119 on: April 29, 2019, 09:24:13 am »
I've used but never actually owned a Hameg scope. Might have to sort that out :)

They also have the component tester (curve tracer) which is rather useful too  :-+
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #120 on: May 04, 2019, 05:05:09 am »
I got bored last night so I came up with my own version of the rear stand-offs for HP gear.
Someone might find it useful maybe..

https://www.thingiverse.com/thing:3606417


BTW, does anyone know what the thread size is for the screws for these things? I'm having trouble matching it up to anything..
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #121 on: May 04, 2019, 05:32:47 am »
Depending on the Era HP/Agilent have used a mix of US threads and Metric. Given the era for those rear feet I would take a stab at UNC or UNF depending. I brought a set of cheap pitch gauges to help me sort them out.

Metric and Imperial pitches https://www.aliexpress.com/item/Thread-Plug-Gage-Stainless-Steel-Metric-American-Screw-Pitch-60-and-55-Degree-Thread-Measuring-Gage/1000003164025.html?spm=a2g0s.9042311.0.0.755b4c4dhy9Pjc

Generally they follow a format of 4-40 8-32 or 6-24 describing the nominal diameter and TPI. 6-32  is fairly common and in about 3.5mm in metric and is also used fairly commonly on general enclosures too. More Reading
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #122 on: May 08, 2019, 12:08:41 am »
Minor addition: Dust covers for an Anritsu OSLN50 O/S/L calibration tee:
https://www.thingiverse.com/thing:3615116

The normal N type male dust covers I had didn't fit, so I designed up one to print from flexible filament.  Doesn't fit too tight (may work in a rigid filament type) and keeps the dust out when you've got your antenna analyzer or VNA on the move.
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #123 on: May 12, 2019, 04:24:26 am »
A few days later, another one:
Rear foot for a Sencore Powerite II PR570 variable isolation transformer - will probably fit other equipment from Sencore as well, there are a few things in this form factor.
https://www.thingiverse.com/thing:3624712
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #124 on: May 12, 2019, 04:39:34 am »
Nice looking prints on the last one  :-+ I will get them added to the front index in a bit.

Getting sidetracked at present into playing with my little 40W Laser and some Acrylic Panels for my 419A project.
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Offline 0culus

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #125 on: May 19, 2019, 03:19:11 am »
I looked through the list at the top of the thread, but didn't see anything (maybe I'm blind  :o ). Has anyone successfully made feet for older style HP gear such as the 8640B sig gen?
« Last Edit: May 19, 2019, 03:21:36 am by 0culus »
 

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #126 on: May 19, 2019, 03:30:48 am »
I looked through the list at the top of the thread, but didn't see anything (maybe I'm blind  :o ). Has anyone successfully made feet for older style HP gear such as the 8640B sig gen?

Not sure but I think you will find them to be the pushbutton types like this one TerraOperative was working on https://www.eevblog.com/forum/testgear/replacement-knobs-feet-and-fittings-for-test-equipment/msg2266131/#msg2266131

Also adding my 60's/70's HP Logo files here as they will be less lost than in TEA  :palm: SVG File in the zip.
« Last Edit: May 19, 2019, 04:04:24 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #127 on: May 19, 2019, 06:22:58 am »
Rhode & Shwarz

Foot, Extra Rubber Foot Bumper for multiple models DaJMasta https://www.thingiverse.com/thing:3453904

Just fyi, this feet don't fit in my Rohde & Schwarz SML 03 siggen.  :'(

Offline Muttley Snickers

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #128 on: June 02, 2019, 07:21:11 pm »
I posted a video link showing this 121GW tilt stand extension in the 121GW Discussion thread and have now included a direct link to the item as well. This is not my product so if you use it be sure to give credit and thanks to the person who did the work.   

https://www.thingiverse.com/thing:3666409
 
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #129 on: June 09, 2019, 06:02:42 am »
Thanks beanflying for this great resource - some of my HP and one TI calculator files
Battery door and catch for HP 41CV printer HP 82143A
HP 34702A Foot
TI Calculator Battery Door
Catch for the HP Classic calculator battery door - they break a lot

Edit : Zip Files separated
      Thanks again beanflying :-+
« Last Edit: June 09, 2019, 07:02:20 am by VK5RC »
Whoah! Watch where that landed we might need it later.
 
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Online beanflying

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #130 on: June 09, 2019, 06:11:24 am »
Thanks beanflying for this great resource - some of my HP and one TI calculator files
Battery door and catch for HP 41CV printer HP 82143A
HP 34702A Foot
TI Calculator Battery Door
Catch for the HP Classic calculator battery door - they break a lot

Can you maybe split the Zip so the contents are easier to link to or know what is inside? Doesn't need top be separate posts just maybe edit the one above then I will add them individually into the index posts.
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Offline salvagedcircuitry

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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #131 on: June 11, 2019, 05:50:24 pm »
Hey guys. I ran into some broken Xantrex XPH power supplies with missing output buttons. I've attached the CAD in stl for 3d printing the button.
These buttons should work on several sorensen / xantrex / tti model power supplies.
Here's what it looks like on the front panel now (the black button in the bottom right corner)
The measurements were taken with a caliper on an OEM button from another psu.





The plastic button is a press-in install. You don't need to remove the front panel of the PSU to install it. The PSU uses a latched output button like old 90s computers. The button stalk is even similar in size.

The part is tiny (less than 0.5in x 0.25in x 0.25in size) and should only take minutes to 3d print.
There are (2) files attached. One features a perfectly cylindrical button and the other has a 1 degree draft.
The OEM output button has a 2 degree draft, but it is purely cosmetic and may cause problems in 3d printing when printing from the side of the smaller diameter.
Ideally, you want to print from the side of the button without the hole so you don't need to clear any support material.

Let me know what you think!  8)
« Last Edit: June 11, 2019, 05:57:57 pm by salvagedcircuitry »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #132 on: June 13, 2019, 04:24:21 am »
Hey guys. I ran into some broken Xantrex XPH power supplies with missing output buttons. I've attached the CAD in stl for 3d printing the button.
These buttons should work on several sorensen / xantrex / tti model power supplies.
Here's what it looks like on the front panel now (the black button in the bottom right corner)
The measurements were taken with a caliper on an OEM button from another psu.

The plastic button is a press-in install. You don't need to remove the front panel of the PSU to install it. The PSU uses a latched output button like old 90s computers. The button stalk is even similar in size.

The part is tiny (less than 0.5in x 0.25in x 0.25in size) and should only take minutes to 3d print.
There are (2) files attached. One features a perfectly cylindrical button and the other has a 1 degree draft.
The OEM output button has a 2 degree draft, but it is purely cosmetic and may cause problems in 3d printing when printing from the side of the smaller diameter.
Ideally, you want to print from the side of the button without the hole so you don't need to clear any support material.

Let me know what you think!  8)

Depending on the space on the top of the button or hole as the case may be model in a 45 degree chamfer is an easy way to avoid needing support material to keep a desired bed orientation. I use this sort of solution fairly often and if you run 0.1mm layers you can push this to nearly 60 degree overhangs without major sagging.
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #133 on: June 13, 2019, 04:33:10 am »
My turn to play with the 121GW with a Magnetic and webbing loop hanger.

The webbing one has been printed and works great and I am waiting on magnets for the other but the modded end should print fine.

6 layers all round, 40% infill, supported on the bed only works fine at 0.2mm layers. While PLA works consider using PETG as it is tougher for impacts and the release catch will flex easier. Print it on edge as the STL in the Zip files below.

Magnet source - eBay auction: #183364882157 20x10mm with 5mm countersunk bore. Also needed is a 5x18mm screw and nyloc nut (or nut and lockwasher)
« Last Edit: June 13, 2019, 05:23:32 am by beanflying »
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Re: Replacement Knobs, Feet and Fittings for Test Equipment
« Reply #134 on: June 22, 2019, 09:56:34 am »
Fluke 5440B/510x/850x feet. - cross posted from a WTB thread so it doesn't get lost.

Where else would I be on a wet and cold Saturday afternoon. I was going for a bike ride then 7 degrees and falling my brain made other decisions and there was beer.  ::)

Obviously not an identical clone but one that leans toward easy printing and matching heights of the real one. Print them on their side for strength on the pips that go into the case. 0.2mm layers with bed only support worked fine.

I have made it to take these 12x12x5.8mm feet readily available on evilbay eBay auction: #143252416915 which like the real one lifts the feet clear of the bench but then stops it from clipping over the side of a unit under it.

STL is in the Zip file.
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