Drilling tool and insert therefor

Details Drilling tool and insert therefor Drilling tool and insert therefor

1991-12-17

1994-04-12

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

407116, 408227, 408231, B23B 5100

Patent

active

053020600

ABSTRACT:
A cutting insert includes a cutting edge extending obliquely relative to a center line of the insert. A chip breaking recess is spaced inwardly from the cutting edge and extends parallel hereto. A drill tool contains three inserts situated along a common diameter. The center insert has a cutting edge radially overlapping the cutting edges of the other two inserts. Each of the cutting edges of the other two inserts extends axially rearwardly and radially outwardly.

REFERENCES:
patent: 3540323 (1970-11-01), Rishel
patent: 3815191 (1974-06-01), Holma
patent: 3887974 (1975-06-01), Sorice
patent: 3942229 (1976-03-01), Takeyama et al.
patent: 3947937 (1976-04-01), Hertel
patent: 3963365 (1976-06-01), Shallenberger, Jr.
patent: 4131383 (1978-12-01), Powers
patent: 4215957 (1980-08-01), Holma et al.
patent: 4844643 (1989-07-01), Icks

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