Author Topic: What did you buy today? Post your latest purchase!  (Read 1326223 times)

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Offline Cubdriver

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Re: What did you buy today? Post your latest purchase!
« Reply #8050 on: January 02, 2019, 08:49:42 am »
It is in this case it is a contactor I salvaged out of a coffee machine they are designed to cycle 20-30 times an hour for years. Contacts unknown but it is a 3phase one so it should do fine.

The thing that comes to mind with that is, isn't a coffee maker typically pretty much a purely resistive load?  It's likely not an issue, but might be something to consider.  What sort of load will the CNC machine present - something more inductive and potentially arcy-sparky?

-Pat
If it jams, force it.  If it breaks, you needed a new one anyway...
 

Offline beanflying

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Re: What did you buy today? Post your latest purchase!
« Reply #8051 on: January 02, 2019, 09:05:05 am »
Power Supply and a VFD on the Head so no harsh on/off and under 3kW total (<15A).

Espresso machines are hard on or off and the contacts are 20A rated each x 3 so cruising in this case. I have never seen one of these fail in a modern machine and some are 7.5kW+ running the same contactor in a lot of cases.
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Offline Specmaster

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Re: What did you buy today? Post your latest purchase!
« Reply #8052 on: January 02, 2019, 09:18:33 am »
It is in this case it is a contactor I salvaged out of a coffee machine they are designed to cycle 20-30 times an hour for years. Contacts unknown but it is a 3phase one so it should do fine.

The thing that comes to mind with that is, isn't a coffee maker typically pretty much a purely resistive load?  It's likely not an issue, but might be something to consider.  What sort of load will the CNC machine present - something more inductive and potentially arcy-sparky?

-Pat
I would tend to agree with you Pat. I used to look after many vending machines including coffee makers and they are mainly resistive loads. I have been called out to so many alleged faulty gear call calls over the years where people who really should know better have built huge great motor control panels for production process that have cost thousands of pounds in damages because the so called professionals used hundreds of relays to control motors on automation of production plants that have failed and ground the entire factory to a halt as a result. Replacing the relays with proper contactors cured the problem permanently and the same panels were still in daily use when they closed the factory many years later and demolished it to make way for housing and a retail park and the only difference is the contact material, a small but vital detail to get right.
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Offline Specmaster

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Re: What did you buy today? Post your latest purchase!
« Reply #8053 on: January 02, 2019, 09:34:34 am »
Power Supply and a VFD on the Head so no harsh on/off and under 3kW total (<15A).

Espresso machines are hard on or off and the contacts are 20A rated each x 3 so cruising in this case. I have never seen one of these fail in a modern machine and some are 7.5kW+ running the same contactor in a lot of cases.
That may be so, but I would do my homework on the contactor / relay part number that you're using to make sure what the contact material is because contactor contacts tend to be rated as AC4 (inching and plugging as you would do on a crane) which is the most difficult load to switch on because of the massive inrush currents, switching off is not so hard to do.

Check the following link and look at the table there which details the massive inrush currents that contractors have to handle (AC2, AC3 and AC4 ratings, AC1 rating can be handled in most cases by a relay if there is very little inductive loading on the circuit.

https://electrical-engineering-portal.com/contactors-direct-on-line-starters

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Offline beanflying

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Re: What did you buy today? Post your latest purchase!
« Reply #8054 on: January 02, 2019, 10:06:20 am »
Worst case here is likely to be a tool crashing into the bed which already has proximity sensors on it and disables the VFD. VFD failure and magic smoke release to short will likely trigger the ELCB or fuse board breaker before I can get to the stop switch.

So the emergency stops and contactor are more belts and braces to keep me happy I can manually kill it rather then yank the plug out of the wall (like its former owner used to have available) or if I lift the lid to do something with fleshy bits near the pointy bits keep the spindle from firing up.  :o


edit found a spec sheet AC3 12A / contact
« Last Edit: January 02, 2019, 10:53:12 am by beanflying »
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Offline Edison

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Re: What did you buy today? Post your latest purchase!
« Reply #8055 on: January 02, 2019, 10:11:59 am »
Safety buttons on the industrial trigger are mechanically solved - by pressing, the contacts disconnect mechanically, not electrically (with the exception of security coils circuit breakers and switches). With electrical disconnection, this is considered to be a normal "Stop" button whatever its shape.
Everything works as the weakest link in the chain
 

Offline Edison

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Re: What did you buy today? Post your latest purchase!
« Reply #8056 on: January 02, 2019, 10:15:39 am »
 |O Back to shopping  :palm:   :-DD
Everything works as the weakest link in the chain
 

Offline Gary350z

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Re: What did you buy today? Post your latest purchase!
« Reply #8057 on: January 03, 2019, 10:48:57 am »
This is a magnetic ferrite core memory plane.
("Plane" seems to be the correct term for this.)
I purchased this on ebay from the Russian Federation for $35 including shipping. The shipping time from Russia to the USA was about one week. I didn't have 100% confidance that it would arrive, but it did.
 
This magnetic core memory plane was made in the USSR in 1970s.
It is a 32x32 core memory plane that stores 1024 bits (128 bytes) of data.
The plane outside dimensions are 4.4" x 4.4".
This plane is one of 20 planes forming a magnetic core memory block. The capacity of the whole block is 2560 bytes.
 
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Offline beanflying

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Re: What did you buy today? Post your latest purchase!
« Reply #8058 on: January 03, 2019, 11:02:06 am »
Very 8) Shame I am trying to slim down the collection of 'stuff' but it is fairly slim and maybe in a frame .....  :palm:
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Offline McBryce

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Re: What did you buy today? Post your latest purchase!
« Reply #8059 on: January 03, 2019, 12:43:53 pm »
Yup, they make a nice decoration when framed. Here's mine, probably from the same seller, that I bought a few years ago.

McBryce.

 
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Offline KaneTW

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Re: What did you buy today? Post your latest purchase!
« Reply #8060 on: January 04, 2019, 03:25:12 am »
A HP 4140B and a Merck Spectroquant NOVA 30.
 

Offline cdev

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Re: What did you buy today? Post your latest purchase!
« Reply #8061 on: January 04, 2019, 04:12:52 am »
They are really amazing looking.

Tri-state memory!

This is a magnetic ferrite core memory plane.
("Plane" seems to be the correct term for this.)
I purchased this on ebay from the Russian Federation for $35 including shipping. The shipping time from Russia to the USA was about one week. I didn't have 100% confidance that it would arrive, but it did.
 
This magnetic core memory plane was made in the USSR in 1970s.
It is a 32x32 core memory plane that stores 1024 bits (128 bytes) of data.
The plane outside dimensions are 4.4" x 4.4".
This plane is one of 20 planes forming a magnetic core memory block. The capacity of the whole block is 2560 bytes.
"What the large print giveth, the small print taketh away."
 

Offline beanflying

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Re: What did you buy today? Post your latest purchase!
« Reply #8062 on: January 04, 2019, 04:17:17 am »
Yup, they make a nice decoration when framed. Here's mine, probably from the same seller, that I bought a few years ago.

McBryce.

That's just evil No No I won't succumb to the pretty pictures.   :palm:
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Offline bitseeker

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Re: What did you buy today? Post your latest purchase!
« Reply #8063 on: January 04, 2019, 06:21:51 am »
You guys! Why do you do this to me? Very cool historically nerdy decor. For how long can I resist not buying one? :-DD
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Offline McBryce

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Re: What did you buy today? Post your latest purchase!
« Reply #8064 on: January 04, 2019, 09:36:52 am »
You guys! Why do you do this to me? Very cool historically nerdy decor. For how long can I resist not buying one? :-DD

I'll post a link later to the deep frames needed to mount these, so you have no excuse not to have some core memory on the wall :D

McBryce.
 
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Online Kjelt

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Re: What did you buy today? Post your latest purchase!
« Reply #8065 on: January 04, 2019, 09:53:24 am »
One of my good intentions of the new year was and still is, to only buy stuff that I use directly or on very short term.
I can't find any practical use in 1kB of magnetic core memory so I am safe in resisting  :)
 

Offline McBryce

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Re: What did you buy today? Post your latest purchase!
« Reply #8066 on: January 04, 2019, 10:00:53 am »
One of my good intentions of the new year was and still is, to only buy stuff that I use directly or on very short term.
I can't find any practical use in 1kB of magnetic core memory so I am safe in resisting  :)

Really? How many of your past "good intentions" have you actually managed to keep? My current score is zero.  :-\

McBryce.
 
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Offline TerraHertz

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Re: What did you buy today? Post your latest purchase!
« Reply #8067 on: January 04, 2019, 01:39:16 pm »
I bought a second hand book from a US seller in Baltimore MD (via abebooks.com) It's Vol 2 for a Vol 1 I've had for years.
Nice price: US$ 18.79 plus postage US$ 8.98

The packing was ... strange.

The bookshop put it in what is effectively a brown paper bag. The paper is tough, but stiff cardboard it isn't. The bag inside surface has a tacky coating, so the book doesn't slide around and excess volume of the bag sticks to the other side. Overall volume is basically the same as the book. But there's no resistance to impacts at all.

They put a customs declaration and address label on that bag.

Then someone in LA CA put that in a giant USPS plastic sack, dimensions flat: 1m x 0.7m.  Wiretied the neck of the sack, with another address label. 'INTL SURFACE AIR LIFT'
That has a tick box for "Books/sheet music" but it isn't ticked.

And that's how it arrived.  A book in a bag in a giant sack. This goes up there among the oddest packings I've ever received.
The book is hardback and survived more or less, but is sort of 'rounded on the corners.'

The sack seems pretty useful. Light and strong. Maybe for beach/snorkelling gear. But why was it added?
Collecting old scopes, logic analyzers, and unfinished projects. http://everist.org
 

Online Kjelt

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Re: What did you buy today? Post your latest purchase!
« Reply #8068 on: January 04, 2019, 01:44:01 pm »
Really? How many of your past "good intentions" have you actually managed to keep? My current score is zero.  :-\
McBryce.
Since when are results of the past a guarantee for results of the future?  :)
BTW my score is not 0 , its about 30% best guestimate
 

Offline JaspaJami

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Re: What did you buy today? Post your latest purchase!
« Reply #8069 on: January 04, 2019, 06:26:12 pm »
Agilent E3631A PSU

« Last Edit: January 04, 2019, 06:27:43 pm by JaspaJami »
 

Offline Terry01

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Re: What did you buy today? Post your latest purchase!
« Reply #8070 on: January 04, 2019, 11:23:18 pm »
Pulled the trigger on one of these bad boys!  >:D
Sparks and Smoke means i'm nearly there!
 

Online Mr. Scram

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Re: What did you buy today? Post your latest purchase!
« Reply #8071 on: January 04, 2019, 11:38:51 pm »
Pulled the trigger on one of these bad boys!  >:D
Don't forget the rest!

 
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Offline beanflying

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Re: What did you buy today? Post your latest purchase!
« Reply #8072 on: January 04, 2019, 11:46:49 pm »
Driven small diameter front wheel what could go wrong  :o

My Dad some years ago now went over the bars on a Honda 4 stroke powered beast of very similar style, air ambulance ride to the big smoke, cracked ribs, damaged knee and far more skin removed than was available. Several Skin Grafts later he had me sell the toy for him.

Add Knee and Elbow pads to the helmet uncool as they may look.
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Offline Specmaster

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Re: What did you buy today? Post your latest purchase!
« Reply #8073 on: January 05, 2019, 12:54:56 am »
Pulled the trigger on one of these bad boys!  >:D
You must have far better roads in Scotland then we do, I wouldn't dare to ride that with our roads, hit a pothole with that front wheel and you'll be flying over those handlebars and be skimming along the road surface, so you had also better get some serious body protection just to keep your skin where it belongs, on you.  :scared:
Who let Murphy in?
 

Offline Gary350z

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Re: What did you buy today? Post your latest purchase!
« Reply #8074 on: January 05, 2019, 07:21:54 am »
Yup, they make a nice decoration when framed. Here's mine, probably from the same seller, that I bought a few years ago.
McBryce.
 
 
Putting the memory board on standoffs is a great idea. I was going to put it in a frame like a photo (smashed flat), but now I'll use your idea. Thanks :-+
« Last Edit: January 05, 2019, 07:24:28 am by Gary350z »
 


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