我们改制卧式光学计内孔测量装置,使之用于内螺纹中径的测量,经过初步的测试和鉴定,这种测试方法,测得的结果比较稳定,和万能测长仪测得的结果比较接近(见附表)。下面就这个内测量装置的改装及测试的计算方法说明如下。一、测量装置的改装改装方法简单,只要取下卧式光学计内测量头1,装上一个带钢球的测量头2,就组成内螺纹中 We modified the horizontal optical instrument bore measurement device, so that the diameter for the measurement of internal thread, after preliminary testing and identification, this test method, the measured results are relatively stable, and the universal length measuring instrument measured results Close (see schedule). The following on this measuring device modification and testing methods are described below. First, the modification of the measuring device Modification method is simple, just remove the horizontal optical measuring head 1, equipped with a ball with the measuring head 2, the internal thread