攻制两同轴度要求较高的两个相距间隔较大的螺孔(图1)时,采用标准丝锥,分别从外侧攻制。因手工操作难以控制丝攻方向,往往丝锥对孔口产生一些偏斜,故攻制的螺孔,两螺孔的同轴度很难保证,零件的不合格率很高。对此,我们设计了图2所示的同心丝锥,解决了攻丝偏斜问题。 In the course of tapping the two larger screw holes (Figure 1), which have high requirements of two concentricity, the standard taps are used for tapping from the outside. Due to the manual operation is difficult to control the direction of the silk tapping, often the tap has some skew to the hole, so the tapping hole and the coaxiality of the two screw holes are hard to guarantee. The failure rate of the parts is very high. In this regard, we designed the concentric tap shown in Figure 2, to solve the problem of tapping skew.