Drill plate with a clamping attachment in a base body

A drilling tool cutting insert adapted to be clamped in a rotatably driven drilling tool base body, the base body having a mounting groove formed in an end thereof defined by a pair of clamping jaws, each of the jaws having a bore therethrough, one of the bores being threaded, the bores for receiving a mounting screw for clamping said cutting insert in the mounting groove, each of the jaws having a centering face, said cutting insert comprising:

• a plate-shaped cutting element having a first end, a second opposite end, and a bore therethrough for receiving the mounting screw,
• said first end of said cutting element having a pair of mutually opposing cutting edges, said element having a chip face extending from each said cutting edge to said second end of said element, each of said chip faces having a centering fin with a centering face thereon,
• said cutting element centering faces adapted to engage with the centering faces on the jaws of the base body to center said cutting insert in the base body,
• said cutting element centering faces and the centering faces on the jaws of the base body being the sole means of centering said cutting insert in the base body.

A drilling tool comprising:

• a drilling tool cutting insert, and
• a rotatably driven drilling tool base body, said base body having a mounting groove formed in an end thereof defined by a pair of clamping jaws, each of said jaws having a bore therethrough, one of said bores being threaded, said bores for receiving a mounting screw for clamping said cutting insert in said mounting groove, each of said jaws having a centering face,
• said cutting insert comprising:
• a plate-shaped cutting element having a first end, a second opposite end, and a bore therethrough for receiving the mounting screw,
• said first end of said cutting element having a pair of mutually opposing cutting edges, said element having a chip face extending from each said cutting edge to said second end of said element, each of said chip faces having a centering fin with a centering face thereon,
• said cutting element centering faces adapted to engage with said centering faces on said jaws of said base body to center said cutting insert in said base body,
• said cutting element centering faces and said centering faces on said jaws of said base body being the sole means of centering said cutting insert in said base body.