在机械制造中,利用圆柱、圆球或圆片(垫圈)进行某些复杂尺寸的高精度测量是很多的。例如大家所熟知的利用三针来测量螺纹的有效径(中径)和利用圆柱来测量齿轮的节圆直径,又如利用圆球测量燕尾槽的量规等。 本文所叙是在“工厂技术与机械制造”(Werkstatts-tecbnik　und Maschin In mechanical manufacturing, the use of cylindrical, spherical or wafer (washer) for some complex dimensions of high-precision measurement is very large. For example, it is known to use three needles to measure the effective diameter (diameter) of a thread and to measure the pitch circle diameter of a gear by using a cylinder. Another example is a gauge for measuring a dovetail groove using a ball. This article describes the “factory technology and machinery manufacturing” (Werkstatts-tecbnik und Maschin