Cutting insert

A polygonally shaped metal cutting insert for use in parting or grooving operations and turning in a separate operation comprising top and bottom faces and front, rear and a pair of side peripheral faces;

• a front cutting edge formed at the intersection of the top face and the front peripheral face for use in the parting and grooving operations and first and second side cutting edges formed respectively at the intersections of said top face and the two side peripheral faces for use in the separate turning operation;
• chip forming means located on said top face within an area defined by said cutting edges and comprising a pair of spaced apart chip deflector ridges extending longitudinally along a front end of said top face and projecting therefrom above the level of the cutting edges, each ridge being formed with a front deflector surface with a side deflector surface, the front deflector surfaces being spaced apart symmetrically with respect to a longitudinally directed median axis of the insert, being located in the vicinity of the front cutting edge and being respectively spaced from said front cutting edge by a pair of front rake surfaces, said side deflector surfaces extending respectively along the lengths of said cutting edges and being respectively spaced therefrom by side rake surfaces.