Patent ID: 7972090

Claim:
An indexable turning insert comprising two opposing large sides ( 2 , 3 ) formed by a support centre part ( 4 ) and a plurality of cutting parts ( 5 - 8 ) projecting outwardly therefrom, each having a cutting edge ( 9 - 12 ) extending between said sides and being spaced apart around the outer perimeter of said centre part for indexing, characterized in that it comprises four said cutting parts, each cutting part has a clearance side ( 13 ) extending on one of said sides of the insert from the cutting edge of the cutting part towards said centre part ( 4 ) while making clearance angles (C 1 , C 2 ) in two dimensions with respect to the cutting edge, said cutting edge of each cutting part makes a working lead angle being below 90° by less (C 3 ) than said clearance angles with the other of said sides of the insert, and every second of said cutting parts as seen in the direction of said outer perimeter of the insert have said clearance side on a same first side of said sides of the insert and the other two cutting parts have their clearance side on a second side of said sides of the insert for forming couples of mutually indexable cutting parts.