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因左旋圆板牙比较少,在没有加工左旋螺纹的条件时,要求不十分严格的场合下,可以用普通右旋丝锥来应急。其方法很简单,先按图1制作丝锥导向体,两孔轴线平行度0.05mm。为了便利攻螺纹,加工时先攻螺纹孔,后再加工导向孔。所要铰的螺纹直径与选择的丝锥直径相同,以保证相同的螺纹升角。铰左旋螺纹时,按图2装配,注意安装时丝锥刃口不要超过两孔中心连线,使切削后角略大于或等于零度,调整后角可以利用改变M4螺钉端部
Due to the relatively small number of left-hand circular die, in the absence of processing conditions of the left-hand thread, the request is not very strict occasions, you can use ordinary right-hand tap emergency. The method is very simple, according to Figure 1 making tap guide body, parallel to the axis of the two holes 0.05mm. In order to facilitate the tap, the first tap hole processing, and then processing guide hole. The diameter of the thread to be hinged is the same as the tap diameter selected to ensure the same thread lift angle. Left-hand thread hinge, according to Figure 2 assembly, pay attention to the installation of the tap edge do not exceed the center line of two holes, the cutting angle slightly greater than or equal to zero degrees, adjust the angle can be changed by changing the end of the M4 screw