Coil mill

That is to say a disc of radius R , center C, horizontal axis CO, which rolls without slipping on a circular track of center H, located at the vertical of O (out of HO = R), of ray L = OC. The disc thus swivels vertically at the speed of precession \ dowry {\ psi} such as: l \ dowry {\ psi} = R \ dowry {\ phi}

The angle of nutation is fixed and equal to 90°.

This movement is known as out of wheel-of-mill: the grain located between the rim of the disc and the track is ground, giving flour.

What is remarkable (theoretically) is that: it is not only the “weight” of the disc (the grinding stone) which crushes the grain, but still the effect of the gyroscopic couple .

See too

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