In gear machining, it is often necessary to hobbing a large-mass helical gear having a number of teeth of more than 100 on a gear hobbing machine, and it is often difficult to perform a gear changer that does not have a main gear of 100 teeth or more. Therefore, the following three methods are often used for large-mass helical gears with a number of nips of 101, 103, .... (1) Use the fire mass gear as the split gear to roll. That is, a spur gear is first hobbed on a hobbing machine, and the number of teeth is the same as the number of teeth of the helical gear being machined.
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