In the aperture size processing, there is often a requirement that the extraction of the mast surface must be measured, as shown in Fig. 1. In the case where the mast is not allowed to be withdrawn, it is obvious that the universal inner diameter gauge cannot be measured. The general case is to take the bow micrometer measurement as shown in Figure 2. The bow micrometer is fitted with a differential head at one end and a fixed probe at the other end. When using, it is necessary to find the minimum value in the axial direction and find the maximum value in the radial direction. Obviously, the operation is very inconvenient. I will introduce a new method below, which is simple and convenient. Available at
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