Patent ID: 7597509

Claim:
A cutting tool, comprising in combination: a tool body having a pocket with a floor and two seating surfaces with an apex at an intersection of the seating surfaces; a cutting insert in the pocket, the insert having an oblong mounting hole having a longitudinal axis and a surface defining a conic cross section; a retention screw holding the insert in the pocket, the retention screw having a radius head, the radius head and the mounting hole being sized and configured so that the radius head makes contact with the insert in the mounting hole surface in one seating plane that is generally perpendicular to the longitudinal axis of the mounting hole when the screw is at an angle relative to the longitudinal axis of the mounting hole, wherein the entire contact between the retention screw and the cutting insert occurs between the radius head of the retention screw and the surface defining a conic cross-section of the mounting hole surface of the cutting insert; and wherein the contact between the radius head of the retention screw and the mounting hole surface of the cutting insert along the seating plane occurs on both sides of a line connecting the longitudinal axis of the mounting hole with apex of the pocket and the contact is limited to an angle of approximately 90 degrees on each side.