在车床上用一般的方法攻丝时,容易造成烂牙和螺纹孔偏心,加工质量不易保证。使用本夹头能避免上述情况发生,还能防止丝锥折断。夹头结构如图1所示。夹套2套在4只柱销5上,可在端盖4的孔中轴向滑动,由 In the lathe with the general method of tapping, it is likely to cause rotten teeth and threaded holes eccentric, processing quality is not easy to guarantee. The use of the chuck can avoid the above situation, but also prevent the tap broken. Chuck structure shown in Figure 1. Jacket 2 sets of 4 pins 5, 4 in the end cap can be axially sliding hole, by