Actual Rake Angle of Cutting Edge in Hobbing

A rake angle of cutting tool has a more influence for tool wear and accuracy of finishing surface, value setting of a rake angle is very important. But on the other hand not enough theoretical study has given to this actual rake angle during hobbing operation. Here we would like to show the change of actual rake angle caused by hob, workpiece data and cutting conditions with theoretical calculation. As a result, we found a lead angle more influence for a actual rake angle, and there is large difference between the right and left side in finishing surface such as large module hob.