Patent ID: 6926472

Claim:
A tool for chip removing machining comprising a holder and a cutting insert disposed in the holder; wherein: the holder includes a seat having a first connecting surface on which the insert is mounted, the insert including a chip cutting top side, a bottom surface, an outer peripheral side, and a cutting edge formed between the top side and the peripheral side, the cutting edge being coaxial with a geometric center axis of the insert, the bottom surface defining a second connecting surface facing the first connecting surface and forming therewith an interface between the insert and the holder, a guide structure disposed in the interface for guiding the insert for rotation relative to the holder about the geometric center axis of the insert during a cutting operation, while constraining the insert against radial movement relative to the holder, the guide structure including first and second opposing ring formations on the first and second connecting surfaces, respectively, and arranged coaxially with the center axis, the first and second ring formations having substantially identical respective diameters with reference to the center axis, at least one of the ring formations comprising a circular groove.