To make a basic rock tumbler, all you really need to do is rotate a cylindrical chamber and let physics do its thing. Such contraptions are known as, unsurprisingly, rotary rock tumblers.

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The tumbler mechanism is similar to a rock tumbler, but is crafted out of bits of wood, some rods, a spaghetti sauce jar, and a DC motor which is available out of the types of machines we already ...

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