Patent ID: 8172487

Claim:
An indexable cutting insert, comprising: an upper surface and an opposing lower surface, with a peripheral side surface extending therebetween; a clamping through bore extending between and opening out to the upper surface and the lower surface, the clamping through bore having an insert axis around which the cutting insert is indexable; at least two major cutting edges formed on an upper peripheral edge at the intersection of the upper surface and the peripheral side surface, at least two index planes containing the insert axis and intersecting the at least two major cutting edges; at least two rake points where the at least two index planes intersect the at least two major cutting edges; and at least two insert axial rake angles (α 1 , α 2 ) between lines tangential to the at least two major cutting edges at the at least two rake points and a lower plane defined by the lower surface, wherein an index angle ψ equal to 360°/n is present between the at least two index planes, where n is the number of major cutting edges, and wherein at least two of the at least two insert axial rake angles (α 1 , α 2 ) have different magnitudes.