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[[File:Magnetic_Tumbler_01.jpg|350px|thumb|right|]] | |||
==Info== | ==Info== | ||
'''Member name:''' | '''Member name:''' Matt F | ||
'''Member contact:''' Email, found via list. | |||
'''Project name & pitch:''' Magnetic Tumbler. A toaster-sized tool for tumbling small parts, brass casings, jewelery, etc. I am building it for Protospace, | |||
'''Storage location:''' Bay ?? / Cart | |||
'''Project start date:''' 31 Aug, 2013 | |||
'''Final Deadline:''' 01 Nov, 2013 | |||
==Updates== | |||
''' | *''' 02 Sept, 2013 -''' Test frame is done. Motor appears underpowered, will test with less friction. Added more magnets, will see if enough. | ||
== Additional Details == | |||
A magnetic tumbler is basically a container with magnetic stainless pin shot and some water inside ("shot" meaning tumbling media), that swirls around in a metal tornado, cleaning, polishing and burnishing any small parts you put inside. Good for brass (cartridges?), jewelry, machined parts. | |||
' | The science is pretty low tech. Below the container you have a motor & spinning plate with magnets on it. Then a thin acrylic sheet, and on top goes the container. There's no mixing apparatus inside the container; when the magnets below the vessel spin they take the nearby pin shot on a ride with them and drag the media across the pieces being tumbled, flagellating them at high speed. | ||
https://www.youtube.com/watch?v=M1OXh26hogQ#t=135s <-- Oooh, ahhh. | |||
' | One the size we're building costs ~$2200. The guy in the video above says $150 to build his. | ||
$150? Nope. I think we'll build it for $0. | |||
http://www.rchristopher.com/tech/tumbler.html <-- Rough build plan if you like following concrete plans. I talked to this guy a few years ago, I don't think he really understood how magnets work (Magnets? How do they work?) so I'll improve a bit on his design. | |||
I've built three 95% of the way in the past. Last time I built one my idea of machining was "jigsaw & hot glue". PS's resources can do better. | |||
Partslist: | |||
- Frame (junk wood/acrylic) | |||
- Induction motor (Jorgen donated a few, + there are others) | |||
- Plate (someone will fab) | |||
- Magnets (how do they work?) | |||
- Top deck (scrap acrylic) | |||
- Bowl/bucket/octagonal container for enhanced tumbling (scrap acrylic or bucket) | |||
- Power switch/cord/etc (lots) | |||
All that leaves is the non-consumable pin media, which I have a source on for about 10% the cost of buying it from a normal supply place. And I have some to test with. | |||
Oh, and the magnets will probably be hard drive magnets. Wes has a stack of dozens which I saw and is what reminded me of this. Wes plans on building one for himself, I think, or just the space, not sure. Either way, I can strip extras and it's not a lot of work to make one for the space. | |||
Bonus Science: | |||
Why use this instead of a traditional rotary/vibratory tumbler? A rotary tumbler is speed limited to gravity, you can't spin it faster or nothing actually falls and tumbles. Vibratory tumblers are loud and shake a room and are very slow. This is somewhere on the order of 10-100x faster than either of those because you can force the shrapnel tornado through the workpiece as fast as you can spin the motor. | |||
[[Category:OngoingProjects]] | [[Category:OngoingProjects]] | ||