| 主权项 |
1. 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 flutes extending along the length of cut, each of the blades including a cutting edge at an intersection between a leading face and the land surface, wherein a cutting edge of a first blade is formed at a first distance, X1, with respect to a cutting edge of a second blade adjacent the first blade, and wherein the cutting edge of the second blade is formed at a second distance, X2, with respect to a cutting edge of a third blade adjacent the second blade, and wherein the cutting edge of the third blade is formed at a third distance, X3, with respect to a cutting edge of a fourth blade adjacent the third blade, and wherein the first blade of the plurality of blades forms a first helix angle with respect to the longitudinal axis at the cutting tip, and wherein the second blade forms a second, different helix angle with respect to the longitudinal axis at the cutting tip, and wherein the third blade of the plurality of blades adjacent the second blade forms a third, different helix angle with respect to the longitudinal axis at the cutting tip, and wherein the first, second and third helix angles deviate by at least 2 degrees. |
