ABSTRACT
Shaving cutters are almost invariably made of high-speed steel. A minimum hardness of HRC 63 after tempering is considered satisfactory. Although many gears are satisfactorily produced by hobbing or gear shaping without subsequent gear finishing operations, finishing operations become a necessity when high load-carrying capacities, high speeds, long wear life, or quiet operation make surface finish and tooth accuracy of major design importance. For finishing of involute gears, the gear shaving process is used. In this process, the finishing of gear tooth flanks is performed by shaving cutters. Shaving cutters are sometimes made with one unserrated flank so that only one flank of the work is shaved. This feature may be useful for nonreversible gears driving in one direction only. Depending on the type of shaving, whether transverse, modified underpass, or full underpass, the serrations will be with an annular pattern or with a staggered pattern.
