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千分尺经研磨好以后,要检验两测量面是否平行。小型千分尺可以使用平行平镜光波干涉带的多少来检验,或用其他办法;但大型千分尺在我厂修理以后无法检验,只有拿到计量室去用仪器来检验,不合格再拿回重修,这样很不方便。根据苏联计量法规规定,检验千分尺测量面的平行性要用平行性检验杆。由300公厘以上每隔25公厘分为一种,每种计有4根,每根长度相差0.125公厘,这样由300～1000公厘的千分尺计29种就需要116根的检验杆。检验杆的构造和用法如图1所示。1是检验杆、杆的两端
Micrometers after grinding well, to test the two measuring surface is parallel. Small micrometer can be used to detect the parallel plane light wave interference zone, or by other means; but the large micrometer in my factory can not be repaired after the test, only to get the measuring room to test with the instrument, and then get back to re-repair failure, so Very inconvenient. According to the provisions of the Soviet Union’s measurement regulations, test the parallelism of micrometer measuring surface parallelism test rod. From 300 millimeters per 25 millimeters divided into a kind, each has four, each length difference of 0.125 mm, so from 300 to 1000 mm micrometer 29 need 116 test rods. Test rod structure and usage as shown in Figure 1. 1 is the test rod, both ends of the rod