本期封3(封底里)照片图1及2所示,为球轴承内外环滚道精研磨的专用机床,适于孔径5～10、外径16～30毫米轴承的精研加工,M8801型(图1)加工内环外滚道,M8803型(图2)加工外环内滚道。机床的工件架有三档转速;磨料杆有三档摆动速,并可按工件大小及滚道半径作调节,由千分 This seal 3 (the back cover) photo 1 and 2, shown in Figure 1, for the ball bearing inner and outer raceway lapping lapping machine for lapping 5 to 10, diameter 16 to 30 mm bearing lapping processing, M8801 (Figure 1) machining inner ring raceway, M8803 type (Figure 2) outer ring raceway processing. The workpiece frame of the machine has a third gear speed; the abrasive rod has a third gear speed and can be adjusted according to the workpiece size and the raceway radius,