In order to improve machin ability and reduce galling, the hardness of the gear blanks was increased

In order to
improve machin ability and reduce galling, the hardness of the gear blanks was
increased to range from 217 to 241 HB by heating them to 840°C and then
quenching them in oil. When blanks at this hardness level were drilled, galling
was reduced, surface finish was improved, drill life increased to 50 pieces,
and the cost of drilling was reduced by 80%.

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