在一般数控车床车削螺纹时,若因意外强行退出,为避免继续车削乱牙,必须设法使新装螺纹刀的刀尖与已有螺旋槽对中。本文提出先空走刀运行特别编制的螺纹车削小程序,在低速走刀中观察螺纹刀的刀尖与已有螺旋槽中心的偏移值,通过修改螺纹车刀的刀补值来反复修正,直至对中,达到可以从断点进入螺纹车削而不乱牙的目的。 In the general CNC lathe turning thread, if forced to exit due to accidental, in order to avoid further turning messy teeth, we must try to make the newly installed thread cutter tip and the existing spiral groove alignment. In this paper, we propose a small thread turning program specially developed for the first pass, and observe the offset value between the tip of the thread cutter and the center of the existing spiral groove at a low speed. By repeatedly correcting the value of the cutter of the thread turning tool, Until the center, reached from the breakpoint into the thread turning without messing teeth purpose.