Abstract: A ball nose end mill includes two identical cutting inserts which are clamped into two dissimilar insert seats. Each one of the two insert seats includes a narrower end and a wider end, the narrower end of one insert seat being located at the tip of the end mill, while the narrower end of the other insert seat is located at the end of the insert seat distal to the tip of the end mill. The inserts are correspondingly shaped with a wider end a narrower end, the ends being curved, and with rectilinear longitudinal sides. The inserts may be inclined axially negatively. The ball nose end mill permits two identical inserts to be used, permits large cutting depths to be obtained, and a negative axial inclination permits an impact point that is distanced from the tool tip.

Abstract: A cutting insert for chipforming machining of metal workpieces is disclosed, said insert comprising opposed top and bottom surfaces (11) and (12) and a peripheral wall (13) extending therebetween. The insert has cutting edges at the juncture between at least the top surface and said peripheral wall, a land area (15), and a first descending surface (16) starting from the top inner margin of said land. A number of convexly curved spaced projections (23, 26) being formed on or adjacent said first descending surface, the upper surface of each of said projections being planar and located below the plane defined by the cutting edges (14).