“机床与工具”1957年第2期北京第一机床厂谢培同志所介绍的“三孔同心性检验法”由于没有一个精确的、固定的测量基准,故使测量产生测量误差,现将几种测量情况说明如下: 1.当A、C两孔内的千分表指针同时指在零位时,该文中提到:“……上下来回找表直至当转动检验心轴时,A、C两 “Machine and Tools” 1957 No. 2 Beijing First Machine Tool Plant Comrade Xie Pei introduced the “three holes concentricity test method” because there is no accurate, fixed measurement standards, it makes the measurement error measurement, now a few The measurement conditions are described as follows: 1. When the dial gauge pointer in both A and C holes refers to zero at the same time, it is mentioned in the text: "... go back and forth to look up and down at the table until the test mandrel is rotated, C two