用外径大千分尺测量工件时,测量误差比较大,其原因主要是由于弓架变形所造成的。在此主要介绍由于使用方位和支点的不同给测量所造成的误差。1.把千分尺水平放在平台上校正千分尺零位,多次测量,其结果是零位的稳定性比较好,弓架变形也比较小,但和实际测量出入较大,实用性差。2.外径千分尺身垂直(图1),支点在中间,造成弓架两端向内下垂,零位出现正值 Measuring micrometer with an outer diameter of the workpiece, the measurement error is relatively large, the main reason is due to bow frame deformation caused. This mainly introduces the error caused by the measurement due to the different use of position and fulcrum. 1. The micrometer level on the platform to calibrate the micrometer zero, multiple measurements, the result is zero stability is better, bow deformation is relatively small, but with the actual measurement of the larger, poor practicality. 2. Outer diameter micrometer body vertical (Figure 1), the fulcrum in the middle, resulting in sagging inward at both ends of the bow, zero positive