我厂的长度测量仪器,绝大多数都是解放初期建厂时进口的老仪器,这些仪器大多是精度低,测量范围小,结构落后,性能单一,解决不了大尺寸和复杂零件的测量。如苏联光学分度头,整机只有一个分度头,一个后尾座和一个工作台,没有带任何附件,只能测量花键轴和分度板等一些简单的零件,对其它稍为复杂一些零件的测量就无能为力了,因为用途窄,仪器常年睡觉。为了达到能测量双向凸轮的目的,我在测量装置中做了一个回转 Most of the length measuring instruments of our factory are old instruments imported at the time of liberation. Most of these instruments are low precision, small measuring range, backward structure, single performance and can not measure the large size and complicated parts. Such as the Soviet Union optical indexing head, the machine has only one indexing head, a tailstock and a table, without any attachments, only spline shaft and indexing plate and some simple parts, the other a little more complicated Part measurement is powerless, because the use of narrow, perennial apparatus to sleep. In order to achieve the purpose of measuring two-way cam, I make a rotation in the measuring device