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.
本文作者探索在万能工具显微镜上用间接测量方法测量变螺距误差并进行精度估算。
The author puts forward a method which can measure the varying pitch errors by a universal tool microscope and estimate the measuring errors less than 15pm precisely.
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