当法向齿厚较大时，应该采用空间平行走刀方式规划刀具路径。
And when the thickness is large enough, the spatial parallel tool path should be adopted.
本文主要介绍了采用齿轮卡尺测量双线梯形螺纹中径法向齿厚的方法，同时也测量出螺距产生的误差。
This article mainly introduces the method that adopts gear caliper to measure the median diameter normal tooth thickness of double-line trapezoidal thread.
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