Patent attributes
A rotary cutting tool has a substantially cylindrical main body and four flutes. The main body has a shank end, a cutting end formed integrally opposite the shank end, and a longitudinal axis of rotation. The four flutes include a pair of flutes comprising a first flute and a second flute formed on opposite sides of the main body, and each of the pair of flutes are symmetrical and have the same helix angle. A third flute is formed on one side of the main body between the pair of flutes, and defines a helical cutting edge having a helix angle that is different than the helix angle of the pair of flutes. A fourth flute is formed on the other side of the main body, and defines a helical cutting edge having a helix angle that is different than the helix angle of the pair of flutes and different than the helix angle of the third flute.
