The relationships of working traffic, states and changes in the motion of particles crushed and the grinding parts, their displacement, mixing, grinding grains and particles were analyzed. They depended on conditions of friction, collisions, cutting, disc design features and distribution of holes in the discs. Dynamic movement of elements (parts) of machine design and grains (particles) under idle and workload conditions was taken into consideration. The axial and radial movement of grains in hole-shield space with a detd. cross-section and volume was controlled, regulated or compensated.