Abstract: A cutting tool assembly for turning a stepped square shoulder on a workpiece of a limited maximum depth of cut, the cutting tool assembly including a toolholder for replaceably receiving a substantially square cutting insert with concave side edges and acute insert cutting corners.

Abstract: A metal cutting tool having a metal cutting tip such as a replaceable insert, having top and bottom faces and a plurality of peripheral faces and a rake face forming part of the top face. A cutting edge is formed at the intersection of the top face and one of the peripheral faces. Chip forming means is formed on the top face and comprises, in lateral sectional view, successive portions of which at least one is relatively recessed with respect to a preceding or succeeding portion. A through-going bore is formed in the insert and extends from one of the bottom and peripheral faces to the relatively recessed portion in a direction towards the cutting edge.