手工攻丝,常常因难以控制丝锥对工件端面的垂直度而影响装配质量。为此,可先在一块钢板上加工出几种常用的螺纹孔。使用时,将钢板放在工件平面上,把丝锥拧入相应的螺纹孔中,并使丝锥对准工件上的螺纹底孔,然后压紧钢板,转动铰杠,待丝锥切削部分切入工件后,卸下钢板,便可使螺纹对 Manual tapping, often because of difficult to control the verticality of the tap on the workpiece surface affect the assembly quality. For this purpose, several commonly used tapped holes can be machined on a single steel plate. When in use, place the steel plate on the workpiece plane, screw the tap into the corresponding tapped hole, align the tap with the bottom hole on the workpiece, then press the steel plate and turn the hinge bar until the tapped part cuts into the workpiece, Remove the plate to make the thread right