在普通车床上钻削多台阶深孔时,为获得良好的同心度,可采取如下方法。当钻头在工件上准确定心后,换上后顶针。用顶针顶住钻头尾端的中心孔,并用鸡心夹头将钻柄固定,不使刀具转动,即可进刀钻削。如在加工中途需退出钻头,必须先停车。 When drilling a multi-step deep hole on an ordinary lathe, in order to obtain good concentricity, the following method may be adopted. When the drill in the workpiece accurate centering, put on the thimble. Use the thimble to withstand the center hole at the tail end of the drill bit and fix the drill shank with the center of the chick, leaving the tool to rotate without drilling. If you need to exit the drill during the process, you must stop.