正弦规的制造精度要求很高,其中工作面与圆柱下母线切面的不平行度和两圆柱中心距偏差(以下简称不平行度和中心距偏差)是产生测量误差的主要因素之一。使用时一般采取调头的方法来消除不平行度引起的测量误差。中心距误差对测量精度的影响随着被测角的增大而增大,例如:中心距为100毫米的正弦规,中心距误差3微米,当被测角 The manufacturing precision of the sine gauge is very high. The non-parallelism of the busbar section between the working face and the cylinder and the deviation of the center distance between the two cylinders (hereinafter referred to as the deviation of the non-parallelism and the center distance) are one of the main factors that cause the measurement error. When used to generally take the first way to eliminate the measurement error caused by non-parallelism. The influence of the center distance error on the measurement accuracy increases with the measured angle. For example, if the center distance is 100 mm, the center distance error is 3 μm. When the measured angle