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US 7,153,067 B2Granted
Rotary cutting tool having multiple helical cutting edges with differing helix angles
OwnerMark L. Greenwood, Kevin Crankerinventors
Life of this patent
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Abstract
A rotary cutting tool is disclosed including a substantially cylindrical main body having a shank portion at one end and a point at an opposite end. Five flutes are formed in an outer surface of the main body. Each of the flutes extends continuously from the point to the shank portion, and defines a helical cutting edge having a helix angle between about 32 degrees and approximately 34 degrees with respect to an axis of the main body. At least 2 of the flutes define helical cutting edges having different helix angles.
Claims3
A rotary cutting tool, comprising:
- a substantially cylindrical main body having a shank portion at one end and a point at an opposite end;
- 5 flutes formed in an outer surface of the main body, each of the flutes extending continuously from the point to the shank portion and defining a helical cutting edge having a helix angle of 34, 33, 32, 33, and 34 degrees, respectively, +/−0.3 degrees.
Dependencies are inferred from the claim text.