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First Homemade Ball Mill

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Uploaded on Aug 1, 2011

This is my first attempt at a home built ball mill. I used double stacked skateboard wheel bearings in the idler roller and some other miscellaneous heavy duty ball bearings for the powered roller. I recessed the bearings into the 3/4" plywood walls and they are friction fit in.

The motor is a used 1/4HP 1750RPM blower motor. Motor casing temperature stabilizes at around 135F @ 80F ambient, after about 20 minutes of operation. It seems to do the job just fine.

The mill jar is made of 6" PVC and fittings, utilizing a 4" rubber test cap on the reducer (not shown) to seal it. Currently rotates at ~60rpm. Jar volume is about 3 quarts, and has 3 lifters spaced equally apart on the inside.

I'm using 1/2" Zirconium M "cylpebs" for my milling media. So far it works quite well! I plan on covering the rollers with some 5/8" ID heater hose for better traction.

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