eli5: How does a Millstone actually spin and works?

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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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Anonymous 0 Comments

The bits of rock are the real reason why recipes call you to sieve the flour. Today this is done with steel grinders, so no crunchiness from rocks are added.

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