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在生产中常常遇到内圆弧半径校准件的测量问题 ,其公差在 0 .0 2～ 0 .0 0 5ｍｍ之间 ,过去我们采用弓高弦长坐标法进行测量 ,即在万能工具显微镜上利用纵横坐标由影像法测出其弓高和弦长 ,再通过函数计算 ,求得半径Ｒ ,此法测量精度仅为 0 .0 2～ 0 .0 1ｍｍ ,其原因是 :(1 )?
In the production of often encountered arc radius calibration of the measurement of the problem, the tolerance between 0. 0 2 ~ 0. 0 0 5mm, in the past we use the bow chord length coordinate method for measurement, that is, universal tool microscope The use of vertical and horizontal coordinates by the video method to measure the bow chord length, and then calculated by the function, find the radius R, this method measuring accuracy of only 0 .0 2 ~ 0 .0 1mm, the reason is: (1)?