普通车床的中拖板丝杠与螺母磨损后,会产生以下两种情况:1)被加工平面产生波纹。2)造成中拖板丝杠手柄刻度盘正反转空回量过大,使进刀量不准确:如空回量大于1/20转,则大修后不得验收。在图1所示的典型机构中,是靠调整斜铁来消除其磨损间隙的。但调整数次后,斜铁的上平面即与中 Ordinary lathe in the carriage plate screw and nut wear, it will produce the following two situations: 1) the plane was corrugated. 2) Caused by the screwdriver in the handle plate dial back and forth volume is too large, so that the amount of inaccurate feed: If the empty back to greater than 1/20 turn, the overhaul shall not be accepted. In the typical mechanism shown in FIG. 1, the wear clearance is eliminated by adjusting the wedges. However, after adjustment several times, the upper plane of the wedges is in the middle