Patent ID: 8430606

Claim:
An indexable cutting insert ( 40 ) comprising: first and second side surfaces ( 64 , 64 ′) which are flat, polygonal in shape and parallel to each other; an insert axis (B) perpendicular to the first and second side surfaces ( 64 , 64 ′); a peripheral surface ( 69 ) extending between the first and second side surfaces ( 64 , 64 ′), the peripheral surface ( 69 ) comprising identical peripheral faces ( 70 ), each peripheral face ( 70 ) being located between two adjacent peripheral faces ( 70 ) and being divided into two identical first and second cutting sections ( 72 , 72 ′), each cutting section having: a first cutting edge ( 74 ), a second cutting edge ( 76 ), and a corner cutting edge ( 78 ) which extends between the first and second cutting edges ( 74 , 76 ); and a rake surface ( 80 ) meeting the first side surface ( 64 ) at the first cutting edge ( 74 ), the rake surface having a rake surface flat ( 82 ) forming an engagement surface and a rake surface open edge ( 90 ), the rake surface ( 80 ) meeting the first side surface ( 64 ) at the first cutting edge ( 74 ); wherein: the rake surface flat ( 82 ) meets the second side surface ( 64 ′) at the rake surface open edge ( 90 ); on each peripheral face ( 70 ), the two cutting sections ( 72 , 72 ′) are non-coplanar; each pair of rake surface flats ( 82 ) associated with a corresponding pair of first cutting sections ( 72 ), converge in a direction along the insert axis (B); and the cutting edges ( 74 , 76 , 78 ) are raised above the rake surface flat ( 82 ).