As shown in Figure 1, a part needs to accurately measure the large end diameter of the 90° taper hole φ2.3±0.05mm. If the direct measurement method is used, the φ7 mm hole with a depth of 10 mm makes it difficult to directly measure the size of φ2.3±0.05 mm, and the large diameter contour of the tapered hole is not obvious, so that it cannot be measured accurately, and an indirect measurement method must be used. There is a method for measuring the large diameter of the cone in the Aviation Industry Inspector Manual, as shown in Figure 2. Knowing the radius of the ball r, H_1 and the cone angle 2a, then the diameter of the cone
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