Patent ID: 7246973

Claim:
A tangential cutting insert, comprising: two opposing end surfaces, each end surface having a generally rectangular shape in an end view of the cutting insert; each end surface having four corners, two diagonally opposed lowered corners and two diagonally opposed raised corners, the lowered corners being closer to a median plane M of the cutting insert than the raised corners, the median plane M being located between the opposing end surfaces; a peripheral side surface extending between the two opposing end surfaces, the peripheral side surface comprising two opposing major side surfaces connected to two opposing minor side surfaces; a through bore extending between the major side surfaces and having a bore axis; a peripheral cutting edge formed at the intersection of each end surface and the peripheral side surface, each peripheral cutting edge including major cutting edges formed at the intersection of the major side surfaces with an end surface; a major plane P 2 located between the major side surfaces and perpendicular to the median plane M; a minor plane P 1 located between the minor side surfaces and perpendicular to both the median plane M and the major plane P 2 ; wherein: each end surface comprises first and second abutment surfaces that: (a) are located on opposite sides of the minor plane P 1 , and (b) are spaced apart from one another; the first abutment surface comprises a first abutment region that is on a first side of the major plane P 2 ; the second abutment surface comprises a second abutment region that is also on the first side of the major plane P 2 ; in each cross-section of the cutting insert that (a) is taken in a plane parallel to the minor plane P 1 , and (b) passes through the first abutment region of a given end surface, the first abutment region slopes in a first direction relative to said major plane P 2 ; and in each cross-section of the cutting insert that (a) is taken in a plane parallel to the minor plane P 1 , and (b) passes through the second abutment region of the given end surface, the second abutment region slopes in a second direction relative to said major plane P 2 , the second direction being opposite the first direction.