Patent ID: 7371037

Claim:
A rotary cutting tool extending along a longitudinal axis and comprising: a sleeve configured to mount said tool on a machine tool; a first cutting portion including a plurality of first helical teeth having a helix direction, each of said first helical teeth having a first cutting edge oriented so as to cut in a first direction of rotation of the tool; a second cutting portion offset from the first cutting portion along the longitudinal axis such that said first cutting portion is situated between said second cutting portion and said sleeve, said second cutting portion including a plurality of second helical teeth having said helix direction, such that said first and second helical teeth have a same helix direction, and, each of said second helical teeth having a second cutting edge oriented opposite the first cutting edge of said first helical teeth so as to cut in a second direction of rotation of the tool, said second direction of rotation being opposed to said first direction of rotation for said first helical teeth.