我厂产品中的一个零件,需测量其中4.5±0.1mm长一段的外径φ7_(-0.03)~0mm,由于此处长度小于通用的外径千分尺的尺头外径,故无法测量,若利用螺纹千分尺就可解决这个问题。其测量方方法如图所示。选用螺纹千分尺中的任意二个锥形量头如图安装好,再用一个7mm的块规标定螺纹千分尺在7mm时的值,之后就可进行测量了。外径实测偏差为:偏差=实测值-标1.螺纹千分尺;2.4锥形量头;3.零件 One of the parts in our factory needs to measure the outer diameter φ7_ (-0.03) ~ 0mm of the length of 4.5 ± 0.1mm. Since the length here is smaller than the outer diameter of the universal outer diameter micrometer, it can not be measured. Thread micrometer can solve this problem. The measurement method as shown. Use any one of the thread micrometer taper head installed as shown, and then use a 7mm block gauge threaded micrometer at 7mm when the value can be measured. Measured deviation of the outer diameter is: deviation = measured value - standard 1. Thread micrometer; 2.4 taper head; 3. Parts