攻制M4～M10的螺纹孔,尤其是攻制盲孔的螺纹较困难,效率低,质量差,更易断丝锥。如图所示的简易攻丝夹头可在普通台钻上使用,不但加工质量好,效率高,且不易断丝锥。工作时,切削扭矩借助于调节螺母9将向下的推力,通过四个销8、弹簧7及钢球6传给离合器5。旋转调节螺母9改变弹簧7的压缩量可控制攻制不同螺纹孔径所需扭炬的大小。当攻丝到底或超负荷时,离合器打滑,故而防 M4 ~ M10 tapping screw holes, especially the blind hole to attack the screw more difficult, inefficient, poor quality, more easily broken tap. As shown in the simple tapping chuck can be used in ordinary bench drill, not only processing quality, high efficiency, and not easily broken tap. In operation, the cutting torque is transmitted to the clutch 5 via the four pins 8, the spring 7 and the ball 6 by means of the adjusting nut 9 pushing downwards. Rotating the adjustment nut 9 Changing the amount of compression of the spring 7 controls the size of the torch needed to take different thread diameters. When the tapping in the end or overload, the clutch slippery, so anti-