As shown in the figure, the outer diameter D, the aperture d and the hole spacing angle α are known. After processing, the common caliper measures the hole distance, and L is regarded as the hole center distance dimension. Then: L_1=Ld, L_2=L+d. As a result, a large error is generated and the parts cannot be assembled. The reason is that L_1 or L_2 is not linear with L and d, but is a spatial arc size relationship and cannot be simply added or subtracted. L is not the hole center distance dimension, but the theoretically existing geometry. From the relationship between triangle and geometry:
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