The advance weight hammer (Fig. 1) produced by our factory is a precision casting with a weight tolerance of 5g in pairs and a wear reduction from the A side when the pairing is processed. Heavy hammer R20±0.026mm, open circular arc surface processing requirements are high, when grinding the circular surface, the workpiece is positioned with φ15mm hole and casting outer arc surface, pressed on the grinding fixture for processing, grinding machine during processing The scale controls the radius of the arc. In the past, during the inspection process, it was assumed that the center of rotation of the dial indicator on the gauge coincides with the center of the arc, and the dial indicator should be rotated within the tolerance range. However, the actual test found that this idea is not valid, because the outer circle positioning point of the product is non-machined surface, and
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