当千分尺在使用后,尺架导孔与测杆磨损造成轻向摆动增大,需要进行缩孔。千分尺缩孔方法有很多。《计量工作》74年5—6合刊介绍的天津缝纫机厂计量室制作的千分尺缩孔器较为适用。但有两个缺点:一是定位方式不好,使用中会造成尺架与微分头部分错位,止动器卡死;二是对于量限不同的尺不能通用。我们针对以上缺点进行了一些改进,一年多实践证明效果较好,现简介如下; When the micrometer is used, the guide rail and the spindle rod wear caused by increased light swing, the need for shrinkage. Micrometer shrinkage methods are many. “Metrology” 5-6 Joint publication of Tianjin Sewing Machine Factory measurement room made of micrometer shrinking device is more applicable. But there are two shortcomings: First, positioning is not good, will cause the use of the frame and the differential head part of the mismatch, the stopper stuck; second is the amount of different scales can not be universal. We made some improvements to the above shortcomings, more than a year of proven practice is better, are as follows;