Rock_Tumbler_1.jpg
My wife recently started making beads and other things from polymer clay, and wasn't getting quite the finish she wanted using sandpaper.  It turns out that even children's toy rock tumblers are relatively expensive and the professional models are definitely out of our price range, so she asked me to see if I could assemble something from old bits and pieces we had laying around.

The kind of tumbler I've seen before seemed like a fairly simple arrangement - some kind of barrel turned by horizontal rollers, similar to a tumble dryer, so that's what I set out to build.


 
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Step 1:

Parts list - these parts all came from my junk pile.  Nothing was purchased for this project, so technically it cost $0 to build.

1) electric motor from Grand Am electric window lifter.
2) old PC power supply.  This one happens to be a 90W supply.
3) rollers - could be broom handle or any round pole.  These are actually mini rolling pins from my wife's craft supplies.
4) various bits of wood to make a frame and base board.
5) 2 inches of garden hose.
6) power switch.
7) screws, coach bolts w/ nuts
8) anti-slip shelf liner

Tools required:

1) Saw
2) Screwdriver
3) Drill + appropriate sized bits
4) Wrench
5) Sharp knife
6) Soldering iron (or use crimp-on spade connectors)
spark master says: May 7, 2012. 8:57 AM
excellent project. I only suggest (unless another beat me to it) you can coat the rollers with silicone rubber in a tube (if you have left over from something else), or even several coats of rubber cement or rubber inner tube sleeves..

but use wut ya got!

verra nice indeed
dontremember (author) says: May 7, 2012. 9:25 AM
Thank you! As it happens, we had a couple of yards of rubber shelf liner available, so that's what was used.
spark master says: May 7, 2012. 4:56 PM
what do you put in it to polish the beads?
dontremember (author) says: May 8, 2012. 1:04 AM
My wife has tried a number of different things, from play sand slurry down to small dry squares of fine sand paper and denim. I'm not sure which produced the best results. I suppose it depends partly on how smooth the beads are to start with.
spark master says: May 8, 2012. 4:12 AM
well done thanks
gloflyer says: May 6, 2012. 7:01 AM
Totally awesome job. I have a VERY expensive rock tumbler, but needed an extra barrel. I tried the folger's coffee can, but it did not turn reliable. Now I will try adding the shelf liner. It was a big DUH when i saw what you did.

A few tips: Normally you would use tumbling grit instead of sand. I am going to assume that the beads are already reasonably shaped, you just want to add a polish, so a finer grit or even a polish should work fine.

There is way too much sand. Depending on the size of container, back it off to a few tablespoons of grit, and then fill it up about 1/2 way with water.

You do not need any vanes. If you get the slurry to the right consistency, it will slide as needed on its own.

Good luck and let us know how it works.

P.S. A lot of folks use a thin coat of Future floor wax on the beads, and then bake them gently in a low oven.

dontremember (author) says: May 6, 2012. 9:59 AM
Thanks!! I give my wife credit for the shelf liner - I thought maybe just wrapping the rollers would work, but she went ahead and wrapped the barrel too, which works substantially better.
ichibon says: Mar 26, 2012. 10:56 PM
this is such an awesome project. i will inddeed give it a go. 5/5 from moi.

rimar2000 says: Mar 18, 2012. 3:30 PM
Very good work!

Yes, to add vanes is a need. But it is an easy task, now.
dontremember (author) says: Mar 18, 2012. 6:50 PM
Thank you!

We probably won't use the glass jar much. The big red tub in some of the photos is a coffee can with a built-in grip that functions very nicely as a vane. Also, being plastic, I can easily screw through it to add vanes as necessary.
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