Method for measuring inner diameter:
1. When measuring and using an inner diameter micrometer, connect the largest connecting rod to its micrometer head and connect it sequentially to the measuring contact to reduce the bending of the axis after connection 2. When measuring, it is necessary to observe the variation of the micro head when it is fixed and loosened When measuring a hole with an inner diameter ruler, support the measuring contact measuring surface on the surface to be measured, adjust the differential cylinder so that the measuring surface on one side of the differential cylinder swings within the radial section of the hole, find the minimum size, and then tighten the fixing screw to take out and read
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