Abstract: An improved rotary cutting end mill which includes an arcuate shaped circular land on the first relief wall which contacts the cutting edge and a slightly angled cutting end. This end mill yields a smooth finished surface on the work piece and can be used at higher rotary speeds. This end mill shows less corner wear, improved rigidity and is operated with less operating noise.

Abstract: A cutting tool is disclosed which has an axis of rotation and comprises a cutting portion having a tapered body and a generally conically shaped surface. Wall means extend radially into the tapered body and define a curved cutting face wall. A relieved land surface extends to and meets the cutting face wall to define a curved cutting edge. The curved cutting edge is located substantially on or at the conical surface of the tapered body. A lateral support surface is located substantially at or on the conical surface of the tapered body and at a positon generally diametrically opposed to the curved cutting edge. The conical surface of the tapered body is substantially recessed rotatively ahead of the cutting edge to the lateral support surface to provide space for chips and is, also, sufficiently recessed rotatively rearwardly of the cutting edge to the lateral support surface to prevent that area from making contact with the workpiece.