通常对大型千分尺量面平行性检定所使用的工具有:内径千分尺、端面固定有小钢珠的量棒或块规和平行平品的组合等。经多年实践,我们感到检验精度和工作效率都很低,而且不了解弓架的变形,给修理带来了一定的困难。为了改变这种情况,我们遵照毛主席关于“自力更生”的教导,经过大家努力,搞了一台简单的光学仪器。经试用认为效果良好。 Commonly used for large-scale micrometer parallelism verification tools used are: diameter micrometer, the end face is fixed with small steel ball or rod and block rules and parallel combination of flat products. After years of practice, we feel that inspection accuracy and work efficiency are very low, and do not understand the deformation of the bow frame, to bring some difficulties to the repair. In order to change this situation, we followed Chairman Mao’s teachings on “self-reliance” and, through our efforts, engaged in a simple optical instrument. The trial that the effect is good.