Patent ID: 8807889
Filing Date: 2014-08-19
Classification: B23B,Y10T

Abstract:
1. A rotary cutting tool comprising: a generally cylindrical body having a first end, an opposite second end and a longitudinal axis extending therebetween; a mounting portion disposed at or near the first end; a head portion having an outer diameter disposed at or near the second end, the head portion being structured to engage and cut a workpiece; a body relief portion disposed between the mounting portion and the head portion, the body relief portion having an outer diameter less than the outer diameter of the head portion; and a number of flutes extending from the second end of the generally cylindrical body along the head portion and along at least a portion of the body relief portion, each of the number of flutes being generally bounded by a first edge and a second edge, wherein the head portion comprises a number of margin relief surfaces, wherein each of the number of margin relief surfaces is disposed between an adjacent first edge and second edge of the number of flutes and inset a distance from the outer diameter of the head portion, and wherein each of the number of margin relief surfaces extends from the second end of the generally cylindrical body and terminates at a margin seal within the head portion, and wherein the margin seal is generally spaced a distance from the body relief portion, the distance being at minimum about one half of the outer diameter of the head portion.