The mandrel used in hobbing is currently designed in two ways. The first method uses a clearance fit of the hobbing mandrel to the reference hole of the tooth blank, such as H8/h7, H7/h6, H6. /h5, but the geometric eccentricity e will occur due to the fit of the gap between the reference hole of the blank and the mandrel of the hobbing. After the hobbing, the radial runout of the ring gear F_r=2e=2x will occur, and some of the workpieces will exceed the specified value. The second method is to use a gapless centering hobbing mandrel, although it can stably guarantee the F_r value, but it is difficult to manufacture. For this, we
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