Digital controlling equipment driving device

The utility model relates to a part of a grinding machine, especially a workpiece clamping and indexing device of a grinding machine used for processing a universal joint ball rail with a bell-shaped cover. The utility model comprises a main shaft, a clamping mechanism and an indexing mechanism. The utility model is characterized in that a housing is arranged outside the main shaft; an upper end gear disk and a lower end gear disk mutually meshed through end face teeth are arranged between the housing and the main shaft; a push piston is arranged at the left side of the position between the housing and the main shaft; a push pin is arranged between step-shaped end faces of the push piston and the main shaft; a piston end cover is connected to an outer housing close to one end of the push piston. The utility model is used for clamping workpieces, and meanwhile, the workpieces are swung around the center of a ball rail and are accurately divided equally in circumferential direction.