@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...
mnem
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
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. 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
QUICKLY. And yes, enough to quickly affect how it performs as a fan. Also lead/tin/antimony component of the residue completely defeats the intent of using a charcoal filter element.
mnem
Ask how I know.
QUICKLY. And yes, enough to quickly affect how it performs as a fan. 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, 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.
Cheers,
mnem
No, some of us are smart enough to know which side of the fan will bite you and therefore needs a grille. Which ALSO gets coated in lead-bearing rosin if you try to put the filter on ass-backwards.
mnem
"Never argue with a fool. First they drag you down to their level, and then they beat you up with experience."
This rear grill may not be totally finger proof but should keep most numpties from inserting other delicate things in it.
Tabs, mounts, holes etc added and olff to the Laser tomorrow with it but the Bakers Dozen parts came back with no interferences on Fusion so it is off to a good start.
Re fan power/noise DC is simple for speed control and 99% of use have one if not more variable power supplies on the bench so I see no reason to use mains fans not to mention cheaper.
Two knurled thumbscrews to do a filter change as I have them on hand already.
Some Gowin FPGAs. Particularly, GW2AR with 8MB 3.3V DRAM and 8MB 1.8V PSRAM, in QFN88 package.
I ordered way more than I can use, which means, if all goes correctly, I will sell some leftover dev kits (like the Trenz GN1N-9 form factor with built-in JTAG) here.
What I didn't buy today and just because I have polluted (and caused others to pollute) this thread for the last couple of days
Not glued and no fasteners installed but first time off the Laser all the bits snapped into place and work as planned.
Nicely stable and the rear leg could be shortened or maybe removed as the fan makes it sit on the bench well. Only made from junk ply but I have some nice hardwood veneers to maybe do a nicer MK2.
@bean - Nicely done. Yer gonna make me have to look into laser-cutting again, ya evil bastahd.
mnem