US 5,810,517 A · Rotary milling cutters

Abstract

A rotary cutting tool includes three complexly-configured, equally-spaced cutting edges. In a first embodiment, which may generally be characterized as an angle milling cutter or countersink, the cutting edges are defined by the intersection of right circular cylinders, offset from the axis of the countersink, with the frustum of a cone. The axes of the cylinders are displaced from the cone axis a distance greater than their radii. The second embodiment, which may generally be characterized as an end mill, also includes three flutes and three cutting edges. Rather than a frustum of a cone, however, the end mill includes a circumferentially radiused edge defining a quarter section of a torus disposed coaxially about the cutter axis. The cutting edges are thus defined by the inter-section of the flutes defined by offset right circular cylinders and the circumferentially radiused edge. A third embodiment is similar to the first embodiment but comprehends a conical milling cutter which converges to a vertex.

Claims28

Dependent claims

A rotary milling cutter comprising, in combination,

a circular body defining an axis, a cutting end and a shank end opposite said cutting end, said cutting end having a nose, a periphery and an end surface extending from said nose to said periphery, said shank end having a shank extending along said axis,
a plurality of axially extending flutes on said cutting end of said body, each of said flutes defining a wall having a curved section, a flat section tangent to said curved section and a plurality of cutting edges defined by the intersection of said curved sections with said end surface of said cutting end.

Dependencies are inferred from the claim text.

Rotary milling cutters

Life of this patent

Rotary milling cutters

Life of this patent

Abstract

Claims28