Abstract
Tooth surface modification of hypoidgears is inevitable operation to obtain excellent gears with good performance. However in the case of the face hob cutting, it is considerably complicate for gear engineers, because both side of tooth are cut at once. In this paper, the authors present the procedure to obtain the correction values of machine settings for tooth surface modification in the case of face hob cutting and report that the modification of pressure angle and spiral angle can be achieved perfectly for individual demand of both tooth flanks with little influence on other characteristics of tooth surface. The usefulness of this procedure was certificated by cutting test using the prototype machine.
