US Patent 7544021 Rotary cutting tool with non-uniform distribution of chip-breaking features

A rotary cutting tool with a longitudinal axis is provided that includes a shank portion, a cutting portion, and a plurality of chip-breaking features. The cutting portion, which extends out from the shank portion, includes a length, a plurality of blades and a plurality of flutes. The blades and flutes extend substantially all of the length of the cutting portion. Each blade includes a leading face side, a trailing face side, and a land surface that extends between the leading face side and the trailing face side. The plurality of chip-breaking features are disposed in the land surfaces of the blades, and non-uniformly distributed among the blades.