END MILL WITH CONDITIONED CUTTING EDGE AND METHOD OF MAKING SAME

Abstract: a rotary cutting tool includes a shank portion and a cutting portion extending from the shank portion to a cutting tip. the cutting portion has a plurality of blades separated by flutes. each of the blades includes a relief surface and a radial cutting edge formed at an intersection between a respective flute and the relief surface. the relief surface includes an inner eccentric relief immediately adjacent the radial cutting edge and an outer eccentric relief immediately adjacent the inner eccentric relief. the inner eccentric relief is formed with an inner eccentric relief angle, �, of less than about 5 degrees, and wherein the outer eccentric relief is formed with an outer eccentric relief angle, �, of between about 5 degrees and about 15 degrees. a method of making the rotary cutting tool is also described.

Inventor(s): Stephen M. George, Danny R. Davis

CPC Classification: B23C5/10 (Shank-type cutters, i.e. with an integral shaft)

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