Spatula Tzar, who brought us the controversial fly plane, offers a number of other interested projects, including this ball mill (a device used to crush metals and chemicals into a fine powder), made from mainly junk lying around the lab.
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United Nuclear also has plans for a ball mill on their site. Or, they’ll sell you a commercially made one.
But you should make your own on principle.
http://www.unitednuclear.com/ballmill.htm
it doesn’t take much to spot a pair of shopping cart wheels hmmm…
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