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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[tide mill grist mill](https://www.tidemillinstitute.org/grist-mills/) the rotating stone in the mill is rotated by a shaft typically powered by water wheel, tide flow or wind.
You don’t get rocks in your wood because the rocks don’t touch. If you do get rocks, that means the millwright didn’t clean the debris out properly after dressing. You usually have to run a bag of grain (~50 lbs) thru to flush the debris out.
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