Clamped cutting tool

A clamped cutting tool comprising:

• a tool-holder including a forward end portion having an insert receiving recess formed therein, said recess having a bottom wall and at least two side walls extending upwardly from said bottom wall, said bottom wall including a pin-receiving hole of a circular cross-section formed therein so as to extend downwardly;
• a shim member having a bore of a circular cross-section formed therethrough, said shim member being disposed on said bottom wall of said recess in such a manner that said bore communicates with and is concentric to said pin-receiving hole of said tool-holder;
• a cutting insert having an aperture with a circular cross-section formed therethrough, said insert being disposed on said shim member in such a manner that said aperture communicates with said bore of said shim member;
• and
• a locking pin of a circular cross-section for clamping said cutting insert in said tool-holder, said locking pin having a rod portion, a head portion, and a radially outwardly protruding flange portion disposed between said rod portion and said head portion;
• said locking pin being formed so that said flange portion is concentric to said rod portion while said head portion is eccentric to said flange portion, said pin being inserted through said aperture of said cutting insert and said bore of said shim member into said pin-receiving hole of said tool-holder for rotation, with said rod portion and said flange portion being received in said pin-receiving hole of said tool-holder and said bore of said shim member, respectively, so that said head portion is held in abutting engagement with said aperture of said cutting insert to press said insert against said side walls of said holder;
• said shim member and said cutting insert being in a form of a figure which is bilateral about at least an axis and radially symmetric and has a center point of radial symmetry;
• and
• said aperture of said cutting insert being located on said center point, and said bore of said shim member being located on said axis but not being on said center point.