How Do I make a mill/grinder for bark and bone? (energy ...
A ball mill would do well for what you describe: A rotating drum with the material and balls inside. Ball Mill example video 24 seconds As the drum turns, the balls rise along one side, then fall over, as a continuous wave. When the balls fall they smash the material. The longer the mill is run, the finer the product. Dry material works best.
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