Patent ID: 8708616

Claim:
A reversible indexable cutting insert ( 20 ), comprising: opposing first and second end surfaces ( 22 ) interconnected by a continuous peripheral surface ( 24 ), with a median plane (M) located between the first and second end surfaces ( 22 ) and intersecting the peripheral surface ( 24 ) to form an insert boundary line (Lb), and an insert axis (A 1 ) perpendicular to the median plane (M) about which the cutting insert ( 20 ) is indexable, the peripheral surface ( 24 ) including at least three side surfaces ( 26 ) alternating with at least three corner surfaces ( 28 ), with each corner surface ( 28 ) having a corner bisector plane (Pc) containing the insert axis (A 1 ), and the side and corner surfaces ( 26 , 28 ) intersecting with both the first and second end surfaces ( 22 ) at side and corner edges ( 40 , 42 ), respectively, with each side edge ( 40 ) having a major cutting edge ( 44 ), and each corner edge ( 42 ) having a corner and minor cutting edge ( 46 , 48 ), wherein, in a side view of the cutting insert ( 20 ), each major and minor cutting edge ( 44 , 48 ) slopes away from first and second end points (E 1 , E 2 ), respectively, of its mutually associated corner cutting edge ( 46 ), towards the median plane (M), and wherein a first imaginary straight line (L 1 ) extending perpendicular to the median plane (M) and intersecting any one of the corner cutting edges ( 46 ) at any point along its length except the second end point (E 2 ), passes through the median plane (M) inside the insert boundary line (Lb).