In the production, the parts of the inverted step inner hole are often processed, and the dimensional accuracy of the large aperture is relatively high, such as the φ51.1_0~(+0.016) of Fig. 1 and the inner hole size of φ73.5_0~(0.016) of Fig. 2. To detect such a large aperture size in a small aperture, it is difficult or impossible to use a general universal bore gauge. It is not economical to use a special gauge. I use a lathe to detect it. The specific method is:
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