Tool for cutting processing and use of a cutting insert thereon

A tool for cutting processing, the tool comprising:

• a base member having a rotation axis about which the tool rotates during operation;
• a cutting insert being a replaceable cutting insert and having a lower side, a first lateral face, a second lateral face and a through-hole formed therein;
• at least one seat formed on said base member and securing said cutting insert;
• a securing screw for securing said cutting insert to said at least one seat;
• said at least one seat having a base face for supporting said lower side of said cutting insert, a first lateral abutment face for abutting against said first lateral face of said cutting insert, said first lateral abutment face supporting said cutting insert in a radially inward direction, and a second lateral abutment face for abutting against said second lateral face of said cutting insert, said second lateral abutment face supporting said cutting insert axially and in a radially outward direction, said base face of said at least one seat further having a hole formed therein for receiving said securing screw, said hole has with spacing from said base face a threaded hole and closer in a direction of said base face a thread-free hole portion;
• wherein said securing screw has a threaded portion for cooperating with said threaded hole, a head portion for supporting in said through-hole of said cutting insert and between said threaded portion and said head portion a thread-free shaft portion, said thread-free shaft portion has a smaller cross section than said thread-free hole portion;
• wherein said cutting insert is secured to said at least one seat such that said head portion of said securing screw is supported on said through-hole of said cutting insert, said threaded portion of said securing screw cooperates with said threaded hole, and said head portion of said securing screw is resiliently deflected such that said thread-free shaft portion is supported when viewed in a direction perpendicular to said base face in a second quadrant which is disposed in the radially outward direction and axially in a direction of a free end of the tool on said thread-free hole portion;
• and
• wherein a longitudinal axis of said threaded hole is offset in a plane of contact between said head portion of said securing screw and said through-hole of said cutting insert with respect to a longitudinal axis of said through-hole in a direction towards said first lateral abutment face and in a direction towards said second lateral abutment face.