Patent ID: 7607869

Claim:
A cutting insert comprising an upper surface, a lower surface defining a lower plane, and a peripheral surface extending between the upper surface and the lower surface, the peripheral surface is provided with a first pair of opposing first side surfaces and a second pair of opposing second side surfaces, each of the first side surfaces merges with each of the adjacent second side surfaces at a side edge, an intersection of each of the first side surfaces and the upper surface forms a cutting edge, the intersection of each of the side edges and the upper surface forms a cutting corner, each of the cutting edges merges with a lower cutting corner at a first end thereof and with a raised cutting corner at a second end thereof, each of the cutting edges is associated with a rake surface extending inwardly therefrom at the upper surface, the cutting edges slope in opposite directions as seen in a side view of the cutting insert, an inward portion of the rake surface distal the cutting edge forms a main chip former having an upper end, each portion of the upper end is distanced from the lower plane by an end distance that is larger than a respective distance from the lower plane to an adjacent cutting edge portion that lies on a line perpendicular to the cutting edge and passing through the associated portion of the upper end, wherein: a first end of the rake surface adjacent the raised cutting corner and distal the lower cutting corner is provided with a secondary chip former that extends from adjacent the raised cutting corner to the main chip former.