我厂1966年进厂的一台M7120A卧轴矩台平面磨床,仅用了不长时间就出现了故障,其主要表现是:1.进给手柄在“断续”位置时,磨头不是按预选的数据在工作台即将换向时自动送进一个进给量,而是爬行一段距离后,停在某一位置上。爬行的距离远远超过了预选的进给量,并且每次各不相同。工 I plant in 1966 into the plant a M7120A horizontal axis torque table surface grinder, only a short time there was a failure, its main performance is: 1. Feed handle in the “intermittent” position, the grinding head is not pressed The preselected data is automatically fed into a feed as the worktable is about to change direction, but stops at a certain position after crawling for some distance. Creeping distances far exceed the preselected feed, and vary each time. work