Tool holder and cutting insert with centering nose portion

A tool holder adapted to receive a cutting insert comprising an insert pocket having a registering lateral wall comprising:

• a first registering wall portion comprising a guiding registering relief for constraining two degrees of freedom of motion of the cutting insert at a base of the pocket, said guiding registering relief having first and second guiding registering surfaces adapted to receive respectively, in registration abutment therewith first and second guided registering lateral surfaces of a guided relief of the cutting insert;
• and
• at a determined distance from said first registering wall portion, a second guiding registering wall portion comprising a third guiding lateral surface for constraining a further degree of freedom of motion of the cutting insert on the base of said pocket, by receiving in abutment therewith a third guided surface of lateral registering wall of the cutting insert,
• wherein the first and second guiding registering surfaces are mutually inclined so as to provide to the guided registering lateral surfaces of the cutting insert, opposite to the guiding registering surfaces, registration in a determined traveling position, said guiding relief being adapted so that the guided relief constitutes, once in engagement with the guiding relief, an axis for a final rotational movement by means of which the third guided lateral surface is pushed back against the third guiding lateral wall surface.

A set comprising a tool holder and a cutting insert adapted to be mounted on the tool holder, wherein the cutting insert comprises a registered positioning lateral face of registration against a lateral registering wall of a pocket in the tool holder, wherein the registered positioning lateral face comprises:

• a first registering portion comprising a guided registering relief for constraining two degrees of freedom of motion of the cutting insert on a base of said pocket, the guided registering relief comprising first and second guided registering lateral surfaces provided for registration abutment against respective first and second guiding registering lateral surfaces belonging to a guiding relief of said tool holder pocket;
• and
• at a determined distance from the first registering portion, a second registering portion comprising a third guided registering lateral surface for constraining a further degree of freedom of motion of said insert on said base of the pocket, through abutment against a third guiding registering lateral wall surface of said tool holder pocket,
• wherein the first and second guided registering surfaces are mutually inclined and the first and second guiding registering surface are mutually inclined so as to ensure registration in a determined traveling position, with respect to the guiding registering lateral surfaces opposite thereto, the guided relief constituting, once in engagement with the guiding relief, an axis for a final rotational movement by means of which the third guided lateral surface is pushed back against the third guiding lateral wall surface.