由于车床床身导轨和尾架底板的磨损,尾架中心总是低于主轴中心。为了排除这一故障,以往都是采用更换尾架底板或设法提高尾架中心高度尺寸的方法,使之与主轴中心的等高度误差在允差以内。但是以上的修复方法比较繁琐,要反复多次刮研才能达到要求。新修复法是将尾架套筒的锥孔预先制造成与套筒外圆偏心,见附图。以C620车床为例,新制套筒时12~(0+0.027)键槽暂不铣出。在总装时主轴中心与尾架中心 Due to the wear of the lathe bed rails and tailstock floor, the center of the tailstock is always lower than the center of the spindle. In order to eliminate this failure, in the past, the method of changing the height of the tailstock center or changing the height of the tailstock center was adopted, so that the error of the contour with the center of the spindle was within the tolerance. However, the above repair method is more complicated, repeated scraping to be repeated to meet the requirements. The new repair method is to pre-manufacture the taper hole of the tailstock sleeve to be eccentric with the outer circumference of the sleeve, as shown in the attached drawings. To C620 lathe, for example, when the new sleeve 12 ~ (0 +0.027) keyway temporarily not milling. In the assembly of the spindle center and tailstock center