普通车床经过大修,在检查端面精度时,常常会出现两种情况:一种是端面中间凹进去; 另一种是端面中间凸出来。判断是中凹还是中凸的方法是:把百分表吸在横拖板上,由C至B测量工件(见图1),百分表的运动方向与车刀的进给方向完全一致,表中读数不变;当百分表出B向A测量工件时,由于工 Ordinary lathe after overhaul, when checking the accuracy of the face, there are often two situations: one is concave in the middle of the end; the other is the middle of the convex surface. To determine the method of concave or convex is: the dial gauge suction drag plate, measured by the C to B workpiece (see Figure 1), dial indicator movement direction and the tool feed direction exactly the same, Table readings unchanged; when the dial indicator B to A measurement of the workpiece, due to workers