在车床上采用一般攻丝夹头加工盲孔螺纹时,螺纹深度不易控制,过深,丝锥容易折断,浅了必须停车用手摇动床尾手柄攻至尺寸。所以,操作者感到紧张和繁琐。为此,设计制作了盲孔安全攻丝夹头。经使用证明,结构简单,操作方便,效率高。工具结构如图所示,由丝锥套1、钢球2、调节螺钉3、弹簧4、主锥体7等组成。使用时,将工具装入车床尾座锥孔内,然后,摇动尾座手柄, In general use tapping chuck machining blind hole thread, the thread depth is not easy to control, too deep, easy to break the tap, shallow parking must be hand-cranked the end of the handle to attack the size. So, the operator feels nervous and tedious. To this end, the design made a blind hole safety tapping chuck. The use of proof, simple structure, easy operation, high efficiency. Tool structure as shown, from the tap sets 1, ball 2, adjusting screw 3, spring 4, the main cone 7 and other components. When used, the tool into the lathe tail cone hole, and then, shaking the tailstock handle,