在外径千分尺的尺架上,一端装内径千分尺的测微头,另一端装固定测头即成一个弓形尺架的内径千分尺(见图)。它可以在不退出刀杆或刀具的情况下直接测量圆孔的内径,尤其适用于测量直径较大的内孔。这种内径千分尺符合阿贝原则,不存在原理误差。检定方法也同于一般通用内径千分尺。若在这种尺架上,一端配置内径百分表的 Micrometer in the outer diameter of the micrometer frame, one end equipped micrometer micrometer diameter micrometer, the other end of the fixed probe is an arch micrometer diameter scale (see Figure). It can directly measure the inner diameter of the circular hole without exiting the arbor or tool, especially for measuring the larger diameter bore. This diameter micrometer Abbe rule in line with the principle of error does not exist. Test methods are also the same general purpose internal diameter micrometer. If this scale frame, one end configuration ID dial indicator