The outer circle of the bearing ring often needs to be processed by a through-centerless grinding. In general, segmented centerless grinding can achieve very high precision. Mainly divided into coarse grinding, semi-finishing, fine grinding. At each stage, sufficient allowance is removed to ensure that the next section of the grinding does not cause problems such as burns or seismograms. The refined product can achieve the dimensional accuracy of the finished product. Centerless grinding is also used to machine small-sized rolling elements such as rollers and needles.