外径千分尺是一种使用最多 ,最为普通的计量器具。为了保证测量结果的正确性 ,要求读千分尺示值时视差尽可能小。无论新购置还是使用中的千分尺 ,微分筒在固定磁筒上应转动灵活 ,不应发生带有响声的接触现象 ,以免二者间隙过大带来较大的误差 ,这对千分尺的检定和测量是很重要 Micrometer OD is one of the most widely used, most common measuring instruments. In order to ensure the correctness of the measurement results, it is required to read the micrometer when the parallax indication as small as possible. Regardless of the new acquisition or use of the micrometer, the differential cylinder should be flexible in the fixed cylinder should not occur with the phenomenon of contact with the sound, so as to avoid excessive clearance between the larger error, which Micrometer test and measurement It is very important