High productivity, high metal removal rate insert

An indexable cutting insert, comprising:

• an upper surface which is a rake face, a lower surface adapted to be seated in a tool holder, and a side wall extending substantially unbroken therebetween to define a body, said upper surface defining an arcuate concave, convex cutting edge along its periphery, and further defining a land rearward of said cutting edge, said cutting edge further equipped with a plurality of stabilizer pads at regular intervals to improve the strength of said cutting edge, said stabilizer pads formed by joining of different angular surfaces formed in the cutting edge;
• a chip straining surface and at least one directional chip breaker surface formed in the upper surface, said chip breaker surface having an arcuate concave convex configuration corresponding to said cutting edge and descending therefrom toward a center and depth of cut line;
• a central aperture extending at least partially through said insert, said aperture surrounded by a raised angular chip deflecting island to aid chip breaking and to protect a fastener means from chip flow damage, whereby said arcuate concave convex cutting edge reduces localized stress concentration at a depth of cut and imparts improved force distribution across the rake face of the insert, which reduces localized stress concentrations at said depth of cut to yield reduced tendency to form notches in the insert during cutting operations.