Patent ID: 8366354

Claim:
A rotary cutting tool with a longitudinal axis, comprising: a shank portion; and a cutting portion extending from the shank portion to a cutting tip, the cutting portion having a length of cut, and a plurality of blades separated by unequally spaced flutes, each of the blades including a leading face, a trailing face, a land surface extending between the leading face and the trailing face, and a cutting edge at the intersection between the leading face and the land surface, each blade including a chip-breaker pattern extending along the length of cut having a plurality of chip-breaking features disposed in the land surface of each blade wherein the chip breaker pattern begins at a first distance from the cutting tip for a first blade of the plurality of blades, the chip-breaker pattern repeating at the first distance for each alternating blade of the plurality of blades, and wherein the chip-breaker pattern begins at a second, different distance from the cutting tip for a second blade of the plurality of blades, the second blade immediately adjacent the first blade, the chip-breaker pattern repeating at the second distance for each alternating blade of the plurality of blades, and wherein the chip-breaking features on each blade of the plurality of blades are equidistant from each other.