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In hobbing of an automobile transmission gear, multi-gash hobs and smaller outside diameter multi-gash hobs were tested in double efficiency. Among them, the 16-gashes hob showed the best result in tool cost. (Al,Ti)N-coated hobs and high pressure coolant had effects on reducing amount of hob wear in other tests. Double efficient hobbing was adopted in mass production with an (Al,Ti)N-coated 16-gashes...
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