在普通螺丝车床上车制平面螺纹的挂轮计算要比车普通螺纹的挂轮计算复杂得多。车平面螺纹不但跟走刀箱内速比有关,而且还跟拖板箱内速比和横向进给有关。计算出来的准确挂轮比要在现有的交换齿轮当中来选配,而选配齿轮得到的新挂轮比又要符合螺距误差在规定的范围内。若螺距改变,挂轮比又要重新计算。为了减少重复计算,通过实践我们在C6136车床上总结出车平面螺纹的铭牌表如下: In the ordinary screw lathe car flat-shaped thread calculation of the wheel than ordinary car thread calculation is much more complex. Not only with the car plane screw speed ratio inside the knife box, but also with the drag box speed ratio and horizontal feed. The calculated accurate gear ratio is to be matched among the existing gear changes, while the new gear ratio obtained by the gear selection is in line with the pitch error within the specified range. If the pitch change, the re-rotation ratio to be recalculated. In order to reduce double counting, through the practice of our C6136 lathe to summarize the nameplate table car thread as follows: