Cutting insert having a chip deflector

A tool holder comprising a tool holder having a pocket, and a cutting insert;

• the cutting insert having a lower face opposing an upper face at which a front edge region constitutes a rake face for chips produced by an associated front cutting edge, and having a rear side, for alignment of the cutting insert in a mounting position against a rear wall of said pocket, wherein a pair of surfaces are provided protruding from said upper face, said pair of surfaces comprising an abutment surface for driving the insert by a traveling member of the tool holder to the mounting position and, forwardly thereof, a deflecting surface for deflecting the path of chips away from a direction running from the rake face to said deflecting surface, the pocket having a bottom surface, receiving the cutting insert and a side wall adapted to co-operate with and align a rear side wall of the insert and having a guide hole providing guidance in translatory motion, in a specified direction, of a body of said traveling member, a head of which includes a radial projection adapted to abut against said abutment surface of the insert, wherein the direction of the guide hole, running towards the rear side wall, is inclined downwards with respect to a plane of general extension of the bottom surface of the pocket and the lateral extension of the protrusion of the head of the traveling member is of limited size, in order to allow it pass over said deflection surface without coming into contact therewith, and yet sufficient for it to land on the abutment surface for driving the insert to the mounting position.

A tool holder fitted with a cutting insert, the cutting insert having

• a lower face, adapted to be installed against a bottom of a pocket of the tool holder,
• an opposing upper face having a front cutting edge,
• a rear side, for alignment of the cutting insert in a mounting position against a rear wall of said pocket,
• an abutment surface of said cutting insert for abutment of a traveling member of the tool holder, said abutment surface upstanding from said upper face, said pocket including a hole for guidance in translatory motion along a determined direction of a body of said traveling member a head of which includes a radial protrusion designed to come into abutment against said abutment surface of said cutting insert in order to wedge the cutting insert against the base of said pocket, said tool holder including a longitudinal channel adapted to supply a channel provided in said traveling member with a lubricating fluid so that the latter acts as a nozzle.