Author Topic: What did you buy today? Post your latest purchase!  (Read 1305265 times)

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Online TheSteve

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Re: What did you buy today? Post your latest purchase!
« Reply #9100 on: August 25, 2019, 08:47:42 am »
Bought a DLP printer to make these:





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Offline technix

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Re: What did you buy today? Post your latest purchase!
« Reply #9101 on: August 25, 2019, 10:17:08 am »
Bought a DLP printer to make these:


What are those?
 

Offline GreyWoolfe

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Re: What did you buy today? Post your latest purchase!
« Reply #9102 on: August 25, 2019, 12:16:45 pm »
They look suspiciously like wave guides.
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Online xrunner

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Re: What did you buy today? Post your latest purchase!
« Reply #9103 on: August 26, 2019, 01:22:25 am »
Bought a DLP printer to make these:

Nice. Anything special about the resin for those?
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Online TheSteve

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Re: What did you buy today? Post your latest purchase!
« Reply #9104 on: August 26, 2019, 02:05:22 am »
They are RF horns(antennas), lowest freq(biggest horn) is for 18-26.5 GHz. The smallest ones are 110 GHz. They are of course just for show at the moment until they have some metal plating on the inside.
It is standard Elegoo resin.
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Offline beanflying

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Re: What did you buy today? Post your latest purchase!
« Reply #9105 on: August 26, 2019, 02:14:07 am »
Tempted to pull the trigger on a DLP but as the usage would be sporadic pouring and storing open and used containers of resins keeps stopping me before you get to the messy cleanup and post curing. Shame the results are just so good  :palm:

I have been playing with epoxy and poly resins for 30+ years btw so it's not a lack of knowledge just an understanding of some of the downsides of the technology.
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Online TheSteve

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Re: What did you buy today? Post your latest purchase!
« Reply #9106 on: August 26, 2019, 02:41:26 am »
Printed a little something for my wife as well.
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Offline beanflying

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Re: What did you buy today? Post your latest purchase!
« Reply #9107 on: August 26, 2019, 03:10:04 am »
Watching a random eevblog2 video today on modding a commercial smoke extractor while unpacking some carbon impregnated filter material for another job. eBay auction: #143251038585 Quick rummage into the fan collection and out with the shears.

Works a treat even without a shroud, 12V 120mm fan running 7-8V  @ .2A  (for less noise and it works well enough) I have only been using a little fan on an arm over soldering jobs in the past but maybe a DIY enclosure and extractor project coming up. Laser cut ply/acrylic or 3DP for the body is the question :-//

« Last Edit: August 26, 2019, 04:23:37 am by beanflying »
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Offline Mr. Scram

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Re: What did you buy today? Post your latest purchase!
« Reply #9108 on: August 26, 2019, 03:27:19 am »
They are RF horns(antennas), lowest freq(biggest horn) is for 18-26.5 GHz. The smallest ones are 110 GHz. They are of course just for show at the moment until they have some metal plating on the inside.
It is standard Elegoo resin.
Which printer did you buy? Is it the Elegoo Mars?
 

Online TheSteve

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Re: What did you buy today? Post your latest purchase!
« Reply #9109 on: August 26, 2019, 04:05:59 am »
They are RF horns(antennas), lowest freq(biggest horn) is for 18-26.5 GHz. The smallest ones are 110 GHz. They are of course just for show at the moment until they have some metal plating on the inside.
It is standard Elegoo resin.
Which printer did you buy? Is it the Elegoo Mars?

It is the original Anycubic Photon - the cheapest of the cheap, but it is impressing me constantly.
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Online mnementh

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Re: What did you buy today? Post your latest purchase!
« Reply #9110 on: August 26, 2019, 04:15:14 am »
Yeah, I've seen them as cheap as $199 a few months ago. I almost pulled the trigger, but was overextended already. Wouldn't have bought the Odyssey+ but for the price just being too good.

@bean - Nice knock-together. I used plastic pop fasteners to hold the filter in place on mine.  :-+ If you're going to make a frame, you should 3DP it with hinge flanges like a GoPro mount so you can attach it easily to an articulating arm. One of those things that's been on my DSIGD list for like a year...  :-DD

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« Last Edit: August 26, 2019, 04:17:03 am by mnementh »
 

Offline beanflying

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Re: What did you buy today? Post your latest purchase!
« Reply #9111 on: August 26, 2019, 12:56:18 pm »
Yeah, I've seen them as cheap as $199 a few months ago. I almost pulled the trigger, but was overextended already. Wouldn't have bought the Odyssey+ but for the price just being too good.

@bean - Nice knock-together. I used plastic pop fasteners to hold the filter in place on mine.  :-+ If you're going to make a frame, you should 3DP it with hinge flanges like a GoPro mount so you can attach it easily to an articulating arm. One of those things that's been on my DSIGD list for like a year...  :-DD

mnem
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Decided on 12V flop it on the bench option. Laser cut ply or acrylic with three frames, two at the front to sandwich the filter (fairly stiff) between them. Offset from the fan a little so all of the surface will pull air and not be hindered by the motor as much. 150mm on the base front to back for a little more stability. Simple PWM ESC and a jack mounted back there too.

Gave me an excuse to model a rough 120mm Fan to add to the collection too.

Still a WIP  ;)



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Online tautech

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Re: What did you buy today? Post your latest purchase!
« Reply #9112 on: August 26, 2019, 12:59:26 pm »
Bean, Defpom printed one:
https://youtu.be/z1r5QduH_Qg
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Offline beanflying

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Re: What did you buy today? Post your latest purchase!
« Reply #9113 on: August 26, 2019, 01:16:33 pm »
Bean, Defpom printed one:
https://youtu.be/z1r5QduH_Qg

I hadn't seen that one. Ian Johnson did a tube mod for the Hakko here I had seen https://youtu.be/25oSsyMBpj0

None of them appeal to me as I deal with ducting on Coffee Roasters and would rather not for flexabilty on the bench.
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Offline Mr. Scram

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Re: What did you buy today? Post your latest purchase!
« Reply #9114 on: August 26, 2019, 04:14:10 pm »
It is the original Anycubic Photon - the cheapest of the cheap, but it is impressing me constantly.
I've been looking at these printers but the small build volume has been putting me off.
 

Online mnementh

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Re: What did you buy today? Post your latest purchase!
« Reply #9115 on: August 26, 2019, 07:06:03 pm »
Having done a LOT of fan and ductwork type stuff, NEITHER of those solutions are actually "fit for purpose". The ducted filter cube decreases the airflow velocity to the point of uselessness for fume extraction, and the ducted Hakko thing... SERIOUSLY?  :wtf: All it does is approximately double the space taken up by the thing when stowed, and EVEN WORSE space-wastage when deployed.  |O

Just like mine with the square of filter cloth tacked to the front of a fan, bean's take has the beauty of form following function. KISS applies here in the absolute; unless the mod improves effectiveness (which the increased filter surface on bean's design DOES while also directing airflow much more usefully), it's pointless.

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Online mnementh

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Re: What did you buy today? Post your latest purchase!
« Reply #9116 on: August 26, 2019, 07:13:09 pm »
@bean - Nice knock-together. I used plastic pop fasteners to hold the filter in place on mine.  :-+ If you're going to make a frame, you should 3DP it with hinge flanges like a GoPro mount so you can attach it easily to an articulating arm. One of those things that's been on my DSIGD list for like a year...  :-DD

mnem
 :o

Decided on 12V flop it on the bench option. Laser cut ply or acrylic with three frames, two at the front to sandwich the filter (fairly stiff) between them. Offset from the fan a little so all of the surface will pull air and not be hindered by the motor as much. 150mm on the base front to back for a little more stability. Simple PWM ESC and a jack mounted back there too. Gave me an excuse to model a rough 120mm Fan to add to the collection too.

Still a WIP  ;)

I like it a lot. I'm not sure if this was your intent or not, but f you make it so the filter element applies across the curved surface, you'll decrease air resistance thanks to larger surface area while at the same time directing airflow in a manner that greatly enhances the directionality of fume extraction. Added bonus will be longer life of individual bits of filter. Well-done.  :-+

mnem
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Offline Nominal Animal

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Re: What did you buy today? Post your latest purchase!
« Reply #9117 on: August 26, 2019, 07:15:49 pm »
For a silent/low noise fume filter, try using two fans in a push-pull configuration on either side of the filter.

Counterintuitively, you might want to use a reverse cone in front of the intake to increase the speed of the airflow, i.e. a cone where the air intake is at the narrow end.  This way the speed of the airflow is much lower at the filter, and even low-noise fans can generate enough of a pressure differential or airflow through the filter.

It might be interesting to do a three/six-fan setup, where the fans are side by side, and the air intake is a horizontal slit only a few mm tall; i.e. a triangular prism with one of the three faces facing the fan, and the opposite edge is the air intake.
 

Online mnementh

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Re: What did you buy today? Post your latest purchase!
« Reply #9118 on: August 26, 2019, 08:37:29 pm »
Fan in front of the filter is not a good idea with soldering smoke; it carries a large component of vaporised rosin which will quickly coat an unprotected fan with nasty stuff that looks like tobacco tar and contains lead/tin/antimony.  :scared: The little bit that gets through the charcoal filter material we're using still makes things noticeably nasty-looking after a few dozen hours usage.

Two fans in a Vee works very well and enhances stability; it also allows you to use slower, quieter fans and still get the air velocity at the filter you need for useful fume suckage. Downside is heavier, takes up more bench space in use.

mnem
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« Last Edit: August 26, 2019, 08:41:56 pm by mnementh »
 
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Offline Mr. Scram

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Re: What did you buy today? Post your latest purchase!
« Reply #9119 on: August 26, 2019, 08:41:10 pm »
Not a good idea with soldering smoke; it carries a large component of vaporised rosin which will coat an unprotected fan with nasty stuff that looks like tobacco tar.  :scared: The little bit that gets through the charcoal filter material we're using still makes things noticeably nasty-looking after a few dozen hours usage.

mnem
 :scared:
We don’t need the fan to look good.
 

Online mnementh

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Re: What did you buy today? Post your latest purchase!
« Reply #9120 on: August 26, 2019, 08:45:10 pm »
QUICKLY. And yes, enough to quickly affect how it performs as a fan.  :palm: Also lead/tin/antimony component of the residue completely defeats the intent of using a charcoal filter element.

mnem
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Offline beanflying

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Re: What did you buy today? Post your latest purchase!
« Reply #9121 on: August 26, 2019, 08:52:01 pm »
The issue with increasing the airflow speed or adding more fans is noise so it is a balance, this nominal 3-4W fan wound back is to control the noise. Make it sound like a jet taking off and it will sit on the shelf unused, make it to bulky or clunky and you won't find room on the bench for it as an everyday item and it will also sit on a shelf unused. The small extension on top of the fan isn't just aesthetic it will help draw the air up off the bench and reduce air from above.

Should have started a separate thread too  :palm:
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Online mnementh

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Re: What did you buy today? Post your latest purchase!
« Reply #9122 on: August 26, 2019, 10:15:32 pm »
There, there bean; it's not that bad. We all know you didn't MEAN TO nerd-snipe us.  :-DD

110% true on all counts; I learned this the hard way from my own travels down this very road.  :-+ I built several; the two best were a single 5" AC powered muffin fan and two 120mm slimline 12V ones in a Vee with a single piece of filter across the front of both of them. That one was a bit quieter so got used more, until it got knocked off the bench and one of the fans suffered 2 broken blades. The AC fan has been it for several years, and those are the very reasons why. My recommendations are:

1) Design as simple as possible so you actually bother to build the fu**ing thing. The quick & dirty fume extractor you have on hand ALWAYS beats the one you're "gonna make" for the next three years.  :palm: Know thyself, plan thine design accordingly.  ;)

2) Make it small & convenient so you don't mind keeping it at the back of your bench, and so you bother to pull it up to your work.  :-+

3) Choose a  fan that's as powerful as you can tolerate the noise, or plan on the hassle of slowing it down. When in doubt, see number one above. 4-6" (100-150mm-ish) seems to be the sweet spot for both.

4) AC-powered typically have a higher power/lower noise ratio. Some of them are little hurricanes though.  :scared: AC-powered is by default less hassle from a use & standby/storage perspective. (As long as you can have nice little plugs like we do in the US)

mnem
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« Last Edit: August 26, 2019, 10:17:11 pm by mnementh »
 

Offline Mr. Scram

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Re: What did you buy today? Post your latest purchase!
« Reply #9123 on: August 26, 2019, 10:18:44 pm »
QUICKLY. And yes, enough to quickly affect how it performs as a fan.  :palm: Also lead/tin/antimony component of the residue completely defeats the intent of using a charcoal filter element.

mnem
Ask how I know.  ;)
Anything that comes off the fan is sucked into the filter. It’s not a helicopter blade, it’s just a fan. Even crudely shaped sheet metal jobbies still throw air in roughly the right direction.
 

Online mnementh

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Re: What did you buy today? Post your latest purchase!
« Reply #9124 on: August 26, 2019, 10:25:23 pm »
QUICKLY. And yes, enough to quickly affect how it performs as a fan.  :palm: Also lead/tin/antimony component of the residue completely defeats the intent of using a charcoal filter element.

mnem
Ask how I know.  ;)
Anything that comes off the fan is sucked into the filter. It’s not a helicopter blade, it’s just a fan. Even crudely shaped sheet metal jobbies still throw air in roughly the right direction.

You can't handle the fan and NOT touch the accumulation, causing it to flake off onto yourself. Therefore comes the risk of ingestion. The filter by its nature traps the accumulation within itself, greatly reducing the amount of accidental exposure. AS IS ITS SOLE REASON FOR BEING.

Clearly you've never actually handled such a thing or this would be obvious to you. Do it, use it yourself for a few dozen hours and come back here and tell me you think it's a good idea.  :palm:

Cheers,

mnem
 |O
« Last Edit: August 26, 2019, 10:27:42 pm by mnementh »
 


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