Analytical model of worm hob errors with continuous sharpening

Résumé

The module worm hob, through its construction and positioning on the cutter arbor, is affected by errors which step in the generation process on the involute tooth’s flank of the manufactured gears. This paper shows the method for determining the errors which appear at the sharpening of the Fredascon module worms hob with positive rake angle, abraded through continuous helical sharpening of the back edge. The errors obtained for the determining of the profiling errors have a general form and can be singularized for all the worm wheel hobs usually used for gear generation