附图所示的内径千分尺可用来测量直径为23～125mm的内槽,槽离开零件端面的距离不应大于90mm。千分尺内装有固定尺脚5和动脚6。后者利用安置在管子1内有一点弹性的柱塞2移动。由于有滚珠3,故柱塞能在管内均匀的移动。利用测微卡规调整内径千分尺的名义尺寸,槽径与名义尺寸的偏差用测微筒4检测。 The inner diameter micrometer shown in the drawings can be used to measure an inner tank with a diameter of 23 to 125 mm. The distance between the groove and the end face of the part should not be larger than 90 mm. Micrometer equipped with fixed foot 5 and moving foot 6. The latter is moved by a somewhat resilient plunger 2 disposed in the tube 1. Due to the ball 3, the plunger can move evenly inside the tube. Micrometer caliper adjustment using the nominal diameter micrometer size, groove diameter deviation with the nominal size with a micro-tube 4 test.