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在英制丝桿的车床上车制某些英制螺纹时,常发生乱纹的现象(卽俗称乱扣);也就是说,後一刀所车的螺纹不与前刀所车的螺线轨迹相重合。其原因是什么呢?这是因为所车的牙数/吋不是丝桿牙数/吋的整数倍的缘故。有经验的同志们都知道:在2牙/吋丝桿的车床上车制2、4、6、8、10牙/吋的螺纹,无论把开合螺帽(闸瓦)合在任何位置,螺线总是一条。这一点很容易理解,例如: 螺丝刀切入点为a(图一),此时与刀没有任何相对运动的闸瓦上的一点m′与丝桿上的n′点相重合。
In the English screw lathe lathe some British system, the phenomenon of chaos often occur (commonly known as chaos buckle); that is, the knife after the car is not a thread with the front of the car’s spiral path coincides . The reason is that? This is because the number of teeth / inch is not an integral multiple of the number of teeth / inch. Experienced comrades know that when making 2, 4, 6, 8, 10 teeth / inch thread on a 2-jaw / inch screw lathe, no matter where the opening and closing nut (brake shoe) The spiral is always one. This is easy to understand, for example: a screwdriver point of entry a (Figure 1), at this time there is no relative movement with a knife on the brake shoe a point m ’and the screw on the n’ point coincide.