JJG21－95检定规程规定新制的和修理后的外径千分尺测砧与测微螺杆测量面的相对偏移量要检定。测砧与测微螺杆测量面的相对偏移量如下表所示。本文介绍一种自制专用检具，测量千分尺测砧与测微螺杆测量面的相对偏移量，方法简便易行。具体方法如图所示。1）先把被检外径予分尺 JJG21-95 test procedures for the provisions of new and repaired diameter micrometer anvil and micrometer screw measurement surface relative offset to be checked. The relative offset between the anvil and micrometer screw measurement surface is shown in the following table. This article describes a self-made special gage, measuring micrometer anvil and micrometer screw measurement surface relative offset, the method is simple and easy. The specific method as shown. 1) The first seized diameter to be sub-ruler