GB1090430A - Gear cutting tools and method of sharpening same - Google Patents

Abstract

1,090,430. Grinding cutters. GLEASON WORKS. Nov. 15, 1965 [Dec. 24, 1964; June 28, 1965], No. 48405/65. Headings B3D and B3L. A bevel-gear-cutting tool comprises a shank 30 and relatively inclined cutting faces 26, 27 such that the edges may be sharpened by a cutting tool moved in a plane bisecting the angle between the faces without cutting away the shank. The tool is left-, or right-, hand and has sidecutting edges 12, 13 (the outer one 12 being a finishing edge), a top-cutting edge 14 and a mounting face 23. The shank 30 may be made of softer, less-expensive steel and welded or joined to the cutter portion 10. The tool, in use, is clamped by a screw 74 Fig. 9, to a T-support 73 clamped to a block 66 adjustable along a block 62 adjustable transversely and laterally on a tool slide 55. Two such tools are provided in a machine for cutting teeth in a gear G, the gear being indexed by one tooth at-a-time if finish-cutting is taking place or two teeth at-a-time for roughcutting. The cutter is sharpened by a wheel 31, Fig. 4, adjustable axially and vertically. The work is clamped on a bracket 38 adjustable angularly in conjunction with a gauge 44. In modifications, the grinding wheel may be oscillated to produce a concave or convex cutting face on the tool which may have curved edges as illustrated in Figs. 10 and 11 for producing tooth curvature modifications. In a further modification, the cutter is made in the form of a bar 200, Fig. 12. When the bar has been used to a half-way point, it is reversed and used as an oppositely-handed cutter. There is a rounded portion 207 at the base of the groove in the cutter face. In a mounting for the tool, a wedge 238, Fig. 15, can be adjusted longitudinally against a scale to adjust the tool angularly by tilting it about a surface 239. Securing screws 242 seat on a wedge block which tends to increase the clamping forces should the cutting forces tend to displace the tool.