Tool system

A tool system comprising:

• a cutting insert having a planar top side surface, a planar underside surface opposite to the top side, and a peripheral surface extending between the top side surface and the underside surface,
• the top side surface comprising a single depression, the single depression consisting of:
• a planar or concavely curved bottom surface,
• a vertical central axis of the single depression intersects a center of the bottom surface,
• an annular surface continuously inclined, with respect to the top side surface, between a first rounded transition and a second rounded transition,
• the first rounded transition directly connected to the top side surface and the annular surface, and
• the second rounded transition directly connected to the annular surface and the bottom surface,
• a tool holder comprising:
• an insert seat for receiving the cutting insert,
• a top surface adjacent to the insert seat, and
• a face, remote from the insert seat, inclined with respect to the top surface at an obtuse angle (), and
• a clamping element which has an opening having a wall forming a stop, in which opening a clamping screw having a guiding portion is received, the clamping element comprising a face and a projection, the projection of the clamping element having an annular surface, the annular surface of the clamping element and the annular surface of the cutting insert abutting each other in an interlocking manner when the cutting insert is clamped and, during the process of fastening the clamping element on the tool holder, such that when generating a torque, when turning the clamping screw, the face of the clamping element sliding on the face of the tool holder, as a result of which the clamping element moves relative to the tool holder and pulls and clamps the cutting insert into the insert seat,
• wherein the tool system has a functional dimension Fx between a center of the single depression and the stop of the opening, a magnitude of the functional dimension Fx being such that, at a maximum allowable torque M of the clamping screw, the annular surface of the projection annularly abuts the annular surface of the depression with no distance between the annularly abutting surfaces of the annular surface of the projection and the annular surface of the depression and, when the cutting insert is clamped, the guiding portion of the clamping screw abuts against the stop formed by the wall of the opening.