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在车床的两顶尖上加工圆轴时,通常是藉夹头和拨盘来进行的。应用拨盘和夹头,存在着下述主要的缺点:按装和拆卸夹头时,必须耗费辅助时间;应用拨盘和夹头,不能在车床运转的时候按装和拆卸工件;由于夹头的缘故,接近前顶尖的地方不能加工,因此需要全部加工的工件,必须掉头来车;成批的圆轴,顶尖孔往往具有不同的深度,因此一批中的各个工件,当其按装在两顶尖上时,刀架在纵方向的相对位置各各不同,这就给使用纵进刀刻度圈或挡
When machining a round shaft at the two tips of a lathe, it is usually done with a chuck and a dial. Application of the dial and chuck, there are the following major drawbacks: When loading and unloading chuck, you must spend auxiliary time; use the dial and chuck, can not be installed and disassemble the workpiece while the lathe is running; due to the chuck Of the reason, near the top of the top can not be processed, so the need for all the processing of the workpiece must be turned around to come; batch of round shaft, the top hole often have different depths, so a batch of each workpiece, when installed according to When the two top, the relative position of the knife holder in the longitudinal direction are different, which gives the use of longitudinal knife edge circle or block