根据机械加工工艺要求,车床尾座顶尖套锥孔中心线和主轴锥孔中心线对床身导轨的不等高度有比较严格的要求,新出厂的车床,尾座顶尖套锥孔中心线一般高于主轴锥孔中心线0.02～0.06毫米。但是,由于车削工件时,尾座的移动比较频繁,因此,尾座滑动面的磨损严重,一台普通车床每年尾座顶尖套锥孔中心线相对于主轴锥孔中心线下降0.02毫米是司空见惯的。 According to machining requirements, the center of the taper hole center of the tailstock of the lathe tailstock and the centerline of the spindle taper hole have strict requirements on the unequal height of the bed rail. The centerline of the tapered cone hole of the new factory lathe and the tailstock is generally high In the spindle taper hole centerline 0.02 ~ 0.06 mm. However, since the tailstock moves more frequently when turning the workpiece, the wear of the tailstock sliding surface is serious. It is common for an ordinary lathe to reduce the centerline of the tail sleeve taper hole by 0.02 mm relative to the centerline of the spindle taper hole every year .