我厂生产的光学分度头,检定合格出厂后,经过各种环境放置或运输,复检时往往发现示值精度超差。超差值一般从几秒到几十秒,这就是人们常说的“跑盘”或“度盘走动”。它是光学分度头生产中常见的一种现象。为了解决这个长期存在的质量问题,我们进行了一系列的试验和分析工作,找出了“跑盘”原因和克服办法。 I optical indexing plant production head, test after passing the factory, after a variety of environments to place or transport, re-inspection often found that the value of accuracy over tolerance. The difference in value is usually from a few seconds to tens of seconds, which is often said “running plate ” or “dial move ”. It is a common phenomenon in optical indexing heads. In order to solve this long-standing quality problem, we conducted a series of experiments and analyzes to find out why and how to overcome them.