图1所示的90°测量筒,可以测量直角尺的内侧面和外侧面。测量时是用幻光光隙来检验被加工部位的,经刮研后使被加工直角尺与量筒之间光隙均匀一致,用这种方法加工的直角尺精度可达1～2级。最后计量时,采用图2所示方法。把被测直角尺和量筒放在一平板上,用手按住安装着千分表的V形块,并在量筒圆柱上左右摆动,一个高度测出一个数值。这样,在角尺的立边上测出各点 The 90 ° measuring cylinder shown in Figure 1 measures the inside and outside of the square. Measurement is the use of illusion optical gap to be machined parts, after scraping the processed rectangular and graduated cylinder aperture uniform, with this method of processing rectangular angle accuracy of up to 1 to 2 levels. The final measurement, the method shown in Figure 2. Place the measured square and the graduated cylinder on a flat plate. Hold the V-shaped block with the dial indicator by hand and swing it left and right on the cylinder. One value is measured at a height. In this way, measure the points on the vertical edge of the square