Cutting insert

Claim 1

A cutting insert comprising a polygonal body having substantially parallel surfaces and peripheral side surfaces substantially normal to said parallel surfaces joining to form corners of said polygon, at least one of said parallel surfaces having grooved recesses merging at and descending from respective corners of said polygon adjacent respective peripheral side surfaces, inner land portions extending downwardly and outwardly from a parallel surface toward side surfaces, each inner land portion comprising a pair of substantially planar face portions intersecting at a common juncture, each grooved recess including a planar outer land portion joining a respective planar face portion, said planar outer land extending inwardly and downwardly at an acute angle from a side surface to form a cutting edge therewith, each side surface having associated therewith a pair of planar outer land portions and an intermediate planar land portion, said intermediate land portion extending to said inner land portion and to said outer land portions along a plane at an angle of ninety degrees or greater to a respective side surface for terminating respective grooved recesses, said intermediate land portion being interposed said one parallel surface and the lowermost portion of said channel.