Patent ID: 6929429

Claim:
An indexable cutting insert for milling, the insert having a rectangular basic shape and comprising first and second opposite side surfaces intersected by first, second, third and fourth edge surfaces; the first and second edge surfaces lying opposite one another, and the third and fourth side surfaces lying opposite one another; the insert including four pairs of cutting edges, each pair of cutting edges including a major cutting edge and a minor cutting edge meeting at a respective cutting corner of the insert; two of the major cutting edges formed by transitions between the first side surface and the first and second edge surfaces, respectively, and the remaining two major cutting edges formed by transitions between the second side surface and the first and second edge surfaces, respectively; wherein the insert is a double-sided insert with the side surfaces constituting rake faces and the edge surfaces constituting flank faces; the first side surface having two of the cutting corners whose minor cutting edges are each formed by a transition angle of less than ninety degrees between the first side surface and the third edge surface; the second side surface having two of the cutting corners whose minor cutting edges are each formed by a transition of less than ninety degrees between the second side surface and the fourth edge surface; each of the first and second side surfaces intersected by a clamping cavity which defines a center axis; wherein a cutting corner of the first side surface located diagonally opposite a cutting corner of the second side surface defines therewith a bisector plane of the insert which plane substantially contains the center axis; the third and fourth edge surfaces providing positive clearance and being substantially parallel with one another.