ABSTRACT
The kinematics of machining of a gear when the gear cutting tool is in internal mesh with the work gear resembles that when the gear cutting tool is in external mesh with the work gear. The geometry of the generating surface of the gear cutting tool in both cases is of the same nature. When a gear is machined by the gear cutting tool having an internal generating surface, no relative motion of the work gear and/or the gear cutting tool in the axial direction of the work gear is allowed. A large pitch diameter of the enveloping gear cutting tool also results in advantages and disadvantages. In addition to the machining of gear tooth flanks G, the enveloping gear cutting tools can also be applied to machining chamfered gears. For the purpose of design of enveloping gear cutting tools, a generating surface with a round auxiliary generating rack RT can be utilized.
