In production practice, we often encounter workpieces similar to those shown in Figure 1, with high coaxiality requirements for the inner and outer rings. In mass production, it is often necessary to reduce the tolerances of the inner hole before the process, and improve the positioning accuracy to finally meet the accuracy requirements of the parts. To this end, we have designed a variable diameter mandrel that does not need to reduce the tolerance of the inner hole of the workpiece. For parts with different dimensional deviations of the same specification, it is only necessary to adjust the diameter of the mandrel to achieve reliable positioning. The structure is shown in Figure 2. Show. The working process is as follows: first loosen the knuckle nut 6 to make the slider 4
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