Patent ID: 8790049

Claim:
An indexable double-negative cutting insert ( 14 ) having an index axis (A) about which the insert is indexable, comprising: two opposing end surfaces ( 36 ), each comprising at least one first functional surface ( 50 ); a peripheral surface ( 38 ) extending between the end surfaces ( 36 ) and comprising at least one convex protrusion ( 54 ) and at least two second functional surfaces ( 56 ), each extending at least between an adjacent end surface ( 36 ) and the at least one protrusion ( 54 ); a median plane (P) located midway between the end surfaces ( 36 ) and passing through the peripheral surface ( 38 ); and at least two opposing side cutting edges ( 46 ), each formed at a junction between the peripheral surface ( 38 ) and each of the opposing end surfaces ( 36 ); wherein the at least one protrusion ( 54 ) comprises two side abutment surfaces ( 60 ) which converge outwardly towards the median plane (P); on the at least one protrusion ( 54 ), only the side abutment surfaces ( 60 ) are configured as abutment surfaces; in a plan view of each end surface ( 36 ), the protrusion ( 54 ) extends outwardly from the cutting insert ( 14 ); and in each cross-section perpendicular to the median plane (P), which cross-section passes through both opposing side cutting edges ( 46 ) and also through the at least one protrusion ( 54 ), no portion of the peripheral surface ( 38 ) is inward of an imaginary line (L 1 ) connecting the opposing side cutting edges ( 46 ).