生产中常用螺旋测微器千分尺测外圆,但它的测力弹簧常常失效,效率低,容易读错数。图1是我设计制造的外测百分表。表测头由固定测头1和活动测头3所组成,测头3只能向右方移动、它靠测力弹簧7的测力压在被测量表面上。百分表的测头由于其本身的弹簧力使其与活动测头3的右端紧紧接触在一 Spiral micrometer micrometer commonly used in the production of micrometer to measure the outer circle, but its spring force often failure, low efficiency, easy to read the wrong number. Figure 1 is my design and manufacture of external test dial indicator. The probe consists of a fixed probe 1 and a movable probe 3, the probe 3 can only move to the right, it is pressed on the measured surface by the measuring force of the measuring spring 7. Dial gauge probe due to its own spring force so that it is in contact with the right end of the active probe 3 in a