正弦尺是一种高精度的角度测量工具,用正弦尺测量角度的同时也能测量孔距,测量方法如下:1.将正弦尺平放在平板上,被测件固定在正弦尺上,见图1。2.将测微表座放在平板上,测微表头分别与两孔下边接触,并左右移功表座,找出孔边低点,用量块比较测出两孔最低点的 Sine scale is a kind of high-precision angle measurement tool. When measuring the angle with the sine scale, it can also measure the hole distance. The measuring method is as follows: 1. Put the sine scale flat on the flat plate and fix the test piece on the sine scale Figure 1.2. Micrometer stand on the flat, micrometer head with the bottom of the two contacts, respectively, and move the power table seat, find the edge of the hole low, the amount of block the lowest point of the two holes measured