Drill and cutting insert therefor

Details Drill and cutting insert therefor Drill and cutting insert therefor

1995-05-09

1997-04-22

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

407113, 408233, 408713, B23B 5100

Patent

active

056224613

ABSTRACT:
A drill for drilling in metal with improved performance in the smaller diameter range. The drill comprises a drill shaft, the front end of which is provided with radially outer and radially inner inserts, each insert having elongated rhomboidic shape, in which each of the short sides is broken at its middle to form a V-shape having an internal obtuse angle. The inserts are arranged such that the longitudinal axis of the radially outer insert is inclined at an angle from the longitudinal axis that is different from the angle of inclination between the longitudinal axis of the radially inner insert and the longitudinal axis of the drill.

REFERENCES:
patent: 4648760 (1987-03-01), Karlsson et al.
patent: 4889455 (1989-12-01), Karlsson et al.
patent: 5354156 (1994-10-01), Von Haas et al.

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