Steel Flange,Stainless Steel Flange,Carbon Steel Flanges, Pipe Fitting Flange Cangzhou Youlong Pipe Fitting Manufacturing Co., LTD , https://www.ypco88.com I plant a batch of household rice mills out of the rice seat, as shown in Figure 1. In order to complete the part addition, we designed a steel ball top-centering fixture, the principle of which is shown in Figure 2. The working process is: screwing into the hexagon socket screw 6, pushing the φ6mm steel ball 5, so that the 3 uniform steel balls 4 in the 120° direction φ4mm roll outward, and the inner hole of the workpiece φ47mm is tightened, so that the inner hole can be processed.