在车床上套制螺纹,一般均使用板牙架,并利用尾座套筒前平面顶靠板牙,以防丝扣偏斜。待板牙能够自动前行时,可将尾座脱开。但在整个操作过程中,不易掌握板牙与工件中心垂直,造成丝扣偏斜,特别是在进行批量生产时影响生产效率。为改善加工条件,保护 Set the thread on the lathe, the general use of dental frame, and the use of tailstock sleeve flat top against the teeth, to prevent skewing skew. Tailstock to be automatically forward when the tailstock can be released. However, during the entire operation, it is not easy to grasp the vertical position of the die and the workpiece center, resulting in the skew of the threaded fastener, especially affecting the production efficiency during mass production. To improve the processing conditions, protection