使用正弦尺、标准圆柱等量仪检测大锥角(大于30°)时,引入的测量误差较大。本文介绍一种用光学分度头(分度值为2″、3″)检测大锥角的方法,可获得较高的准确度。如图1所示,当锥角为α,锥体对径母线Ⅰ、Ⅱ经旋转分别处于水平位置时,α,β就构成一对互补角,此时的转动角β就便于准确检测,并由α=180°-β可求得锥角。 When using the sine ruler and standard cylinder to measure the large taper angle (greater than 30 °), the measurement error introduced is larger. This article describes a method of detecting a large taper angle with an optical indexing head (indexing value of 2 “, 3”) for high accuracy. As shown in Fig. 1, when the cone angle is α, the cone and the pair of radius bus bars I and II are horizontally rotated, respectively, and α and β form a pair of complementary angles. The rotation angle β at this time is convenient for accurate detection From α = 180 ° -β can be obtained taper angle.