当在车床上攻大直径螺纹时,车床尾座的夹头即使张开到最大程度,有的丝锥柄也放不进去,有的虽然能放进去,但因扭矩太大,夹不紧,丝锥也易跟着工件转。一个较好的解决办法是利用车床刀架和一些垫块构成与丝锥尾端方头相适应的方孔(如图所示),将丝锥插入,以作为“绞杠”。它的优点是, When tapping large diameter thread lathe, lathe tailstock chuck even open to the maximum extent, and some taper shank also let go, although some can put in, but the torque is too large, the clip is not tight, tap Also easy to follow the workpiece turn. A better solution is to use a lathe tool holder and some pads to form a square hole (as shown) that matches the square head at the end of the tap, inserting the tap as “stub”. Its advantage is that,