GB480247A - Improvements in or relating to the finishing of the surfaces of gear teeth - Google Patents

Abstract

480,247. Lapping or burnishing gears. BROWN & SONS (HUDDERSFIELD), Ltd., D., and MERRITT, H. E. June 13, 1936, No. 16540. [Class 60] [Also in Group <I> XXII] In a method of finishing the teeth of helical spur, or worm gears a finishing tool a having teeth conjugate to those of the work b but of different helical angle is arranged on an axis a<1> inclined to the work axis b<1>, the tool gear being mounted in a slide d which is reciprocated in adjustably inclined guides d<1> which are not parallel to either tool or work axes. In a modification, Fig. 2, the tool spindle slide d is reciprocated in guides c. These motions are equivalent as shown in Fig. 3, to traversing the gear b on its axis and traversing the tool in a direction c<1> perpendicular to the tool axis. If the tool acts as a shaving tool it may be reciprocated one or more times across the work while it makes one traverse in the direction c<1> or it may be reciprocated in direction c<1> while it traverses the face of the work. Either of these cycles may be repeated to take successive shaving cuts. A higher speed may be used for lapping or burnishing. The tool gear teeth may have straight or inclined cutting edges to take shaving cuts or they may be smooth to provide a burnishing action or when supplied with abrasive to give a lapping action. Either tool or work may be driven and to provide pressure between tool and work either the non-driven member may be braked or the work and tool may have relative approach feed movement. Specifications 14645/11, 314,708, [both in Class 83 (iii)], and 415,875 are referred to.