I have come accross a spiral bevel gear set, 5DP, used in a milling head drive. The gears run with very little backlash. The material analysis showed that those gears were made of 17CrNiMo6, a 1 mm thick carbourized layer has been also found. The surface hardness of the teeth was measured 68 HRc, while a typical would be around 60 HRc. The measurement has been confirmed by checking in different places. Does anybody know how did they achieve 68 HRc on 17CrNiMo6?
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