Kennametal Inc.

Frederick John Palmer

David J Wills

X Daniel Fang

Jean-Luc Daniel Dufour

Danny Ray Davis

Leonid Boris Sharivker

Sergei Vladimir Boulakhov

A rotary cutting tool with a longitudinal axis includes a shank portion and a cutting portion defining a length of cut. The cutting portion includes a plurality of blades separated by flutes extending along the length of cut. A first blade forms a first helix angle with respect to the longitudinal axis at the cutting tip. A second blade adjacent the first blade forms a second, different helix angle with respect to the longitudinal axis at the cutting tip. A third blade adjacent the second blade forms a third, different helix angle with respect to the longitudinal axis at the cutting tip. The first, second and third helix angles deviate by at least 2 degrees. The cutting edges of the first, second and third blades have unequal indexing.

Rotary cutting tool with blades having repeating, unequal indexing and helix angles

A rotary cutting tool with a longitudinal axis includes a shank portion and a cutting portion defining a length of cut. The cutting portion includes a plurality of blades separated by flutes extending along the length of cut. A first blade forms a first helix angle with respect to the longitudinal axis at the cutting tip. A second blade adjacent the first blade forms a second, different helix angle with respect to the longitudinal axis at the cutting tip. The cutting edge of the first blade is formed at a first distance with respect to the cutting edge of the second blade. A helix angle of at least one of the plurality of blades varies along the length of cut and a distance between cutting edges of the first and second blades varies along the length of cut.

Rotary cutting tool with unequal indexing, alternating helix angle and varying helix angle along length of cut

A cutting tool system is designed to have a combined sinusoidal-shaped and helical-shaped cutting edge formed by an assembly of aligned common cutting inserts each having a sinusoidal and helical cutting edge.

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Studley, United Kingdom

Frederick John Palmer