Because the thrust ball is a kind of point contact bearing, the axial bearing capacity of the thrust ball is relatively low, which is mainly used in the rotary worktable of small or medium machine tools. In addition, the lubrication of the thrust ball is also difficult. The main working principle of Thrust Ball Bearing is the main motor through a series of drive from the gearbox, the power transmission to the turntable under the ring gear, the gear through the thrust ball bearing and Angular Contact Ball Bearing outer ring, the workbench and the support and the rotary table rotates, and realizes the rotational motion of lathe.