Principal:

If plural evenly-spaced barrels mounted in one axis of the turret are
given centrifugal force by planetary motion , mass in barrels adhere to
outward periphery of barrels because of centrifugal force, then top
part of mass slide to the direction of rotation. Pressure and mass flow
action generated by centrifugal force generate the friction between
abrasive media and workpieces by difference of relative movement, which
generates high efficiency of finishing performance