MACHINE A TAILLER LES ENGRENAGES TRAVAILLANT PAR GENERATION

摘要

Apparatus for making gears, featuring a workpiece support mounted to provide rotation of the workpiece about its axis at a basic rate; a cutter having profile generating cutting edges mounted for rotation about a cutter axis at a basic rate bearing a ratio to the basic workpiece rate dependent upon the ratio of the number of profiles being generated to the number of profile generating cutting edges in the cutter, the cutter axis being at an angle to the workpiece axis which differs from 90 DEG by an angle other than the helix angle (taken at the generating circle) of the gear being made, the cutter and workpiece being mounted for relative translation axially of the workpiece; and an element responsive to that relative translation to add to or subtract from the basic workpiece rate a rate of rotation to which the rate of translation bears a ratio equal to the desired lead of the gear being made; whereby successive cuts made in each toothspace are tangent to the adjacent profile at lines oblique to the workpiece axis and extending generally between the fillet and tip of the profile, and between successive cuts tangent to any one desired profile there will intervene a complete revolution of the workpiece.