Gyroscopic effects are used in disc mills. A massive cylindrical roller (runner), capable of rotating around its geometric axis, is set into rotation around a vertical axis (with angular velocity W) and rolls along a horizontal base plate (figure). Such rotation can be considered as the forced precession of a gyroscope, which is what a runner is. With forced precession, the runner's pressure on the horizontal plate on which he is rolling increases. This force grinds and and

Short solution. Format gif