So recently i found about millstones are broadly used to grind many stuff… I have looked around and i cannot find how do they actually spin. Its 2 huge rock discs on top of eachother with a grid on them that grinds the stuff like beans to make tofu… But how does it actually spins? I know there must be an axis to keep them and that they are separated my like half a milimiter. But this does not asnwer my question on whats is spinning. Lastly, how do you not get bits of stone added to the food?
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