Rotary cutting tool

A rotary cutting tool comprising:

• a cutting tool body comprising a cutting end, and the cutting tool body further comprising a cutting portion adjacent to the cutting end;
• the cutting portion comprising a first blade comprising a first finishing cutting portion and a first moderate roughing cutting portion adjacent to the first finishing cutting portion, and a second blade comprising a second finishing cutting portion and a second moderate roughing cutting portion adjacent to the second finishing cutting portion;
• the first finishing cutting portion overlapping one or more of the second finishing cutting portion and the second moderate roughing cutting portion, and the first moderate roughing cutting portion overlapping one or more of the second moderate roughing cutting portion and the second finishing cutting portion;
• and
• wherein the first finishing cutting portion comprises a first finishing straight eccentric ground cutting edge, and the first moderate roughing cutting edge comprises a first moderate roughing sinusoidal cutting edge, and the second finishing cutting portion comprises a second finishing straight eccentric ground cutting edge, and the second moderate roughing cutting portion comprises a second moderate roughing sinusoidal cutting edge.

A rotary cutting tool comprising:

• a cutting tool body comprising a cutting end, and the cutting tool body further comprising a cutting portion adjacent to the cutting end;
• the cutting portion comprising a first blade comprising a first moderate roughing cutting portion and a first roughing cutting portion adjacent to the first moderate roughing cutting portion, and a second blade comprising a second moderate roughing cutting portion and a second roughing cutting portion adjacent to the second moderate roughing cutting portion;
• the first moderate roughing cutting portion overlapping one or more of the second moderate roughing cutting portion and the second roughing cutting portion, and the first roughing cutting portion overlapping one or more of the second roughing cutting portion and the second moderate roughing cutting portion;
• and
• wherein the first moderate roughing cutting portion comprises a first moderate roughing sinusoidal cutting edge, and the first roughing cutting portion comprises a first roughing sinusoidal cutting edge, and the second moderate roughing cutting portion is a second moderate roughing sinusoidal cutting edge, and the second roughing cutting portion is a second roughing sinusoidal cutting edge.

A rotary cutting tool comprising:

• a cutting tool body comprising a cutting end, and the cutting tool body comprising a cutting portion adjacent to the cutting end thereof;
• the cutting portion comprising a first blade comprising a first finishing cutting portion and a first roughing cutting portion adjacent to the first finishing cutting portion, and the cutting portion comprising a second blade comprising a second finishing cutting portion and a second roughing cutting portion adjacent to the second finishing cutting portion;
• and
• the first finishing cutting portion overlapping the second roughing cutting portion and the first roughing cutting portion overlapping the second finishing portion,
• wherein the cutting tool body has a central longitudinal axis, and each one of the first blade and the second blade having a generally helical orientation and are disposed at an angle between about 35 degrees and about 45 degrees relative to the central longitudinal axis of the cutting tool body.