Patent ID: 8491234

Claim:
A double-sided cutting insert having a plurality of convex cutting edges, said double-sided cutting insert comprising: a. a top face and a bottom face separated by a virtual middle plane; b. at least three convex cutting edges on each of said top and bottom faces, each convex cutting edge having at least a curved cutting edge region; c. at least three nose corners on each of said top and bottom faces, each nose corner connecting two of said convex cutting edges; and d. at least three peripheral side surfaces extending from each of said top and bottom faces to said virtual middle plane, each peripheral side surface comprising: i. a first primary conical peripheral surface extending from a primary curved convex cutting edge region at said top face toward a twisted secondary curved convex cutting edge region at said bottom face, and a second primary conical peripheral surface extending from a secondary curved convex cutting edge region at said top face toward a twisted primary curved convex cutting edge region at said bottom face; ii. a first primary planar surface extending from a primary substantially straight cutting edge region at said top face to a virtual middle plane, and a second primary planar surface extending from a primary substantially straight cutting edge region at said bottom face toward a virtual middle plane, wherein both said first and second primary planar surfaces are truncated by at least a common lateral face which is one of perpendicular or at an angle that is less than 90 degrees to both said top and bottom faces; and iii. a secondary conical peripheral surface extending from a nose corner toward said virtual middle plane.