Patent ID: 8882407

Claim:
A cutting insert comprising four cutting edges, each cutting edge including a primary cutting edge, each primary cutting edge being associated with a respective different side surface of the cutting insert, each side surface having a respective rake surface, each primary cutting edge being disposed at an intersection of two side surfaces, a first one of the two side surfaces being the respective side surface associated with the primary cutting edge and a second one of the two side surfaces comprising a rake surface associated with a second primary cutting edge and a clearance surface, the primary cutting edge and the second primary cutting edge each being disposed at an intersection of the first and second ones of the two side surfaces, and planes of the first and second ones of the two side surfaces defining an acute angle, and wherein an upper portion of the clearance surface on the second side surface extends a first distance along the primary cutting edge, and a lower portion of the clearance surface on the second side surface extends a second distance along the primary cutting edge, and the second distance is less than the first distance, and the insert having a generally convex quadrilateral shape comprising four corners comprising two convex acute corners and two convex obtuse corners when viewed along an axis generally parallel to planes of the first and second ones of the two side surfaces.