Indexable insert drill

Details Indexable insert drill Indexable insert drill

1979-04-16

1980-09-02

Hinson, Harrison L.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

407 54, 407 40, 407114, 408 57, 408239R, 408713, B23B 5100, B23B 3110, B26D 112

Patent

active

042204291

ABSTRACT:
An indexable insert drill having a cylindrical body with two flutes and a cutting insert mounted at the end of each flute. The cutting inserts are mounted so that each presents a cutting edge of a length less than the radius of the drill with each edge being positioned to provide negative lead and effectively neutral radial and axial rake. The first of the cutting edges intersects the longitudinal axis of the drill body and extends radially outward to an end area spaced inwardly from the circumference of the drill body. The second of the cutting edges extends from an outer end area radially outward of the drill body circumference to an inner end area radially inward of the radial outermost end of the first cutting edge. Preferably, the first cutting edge extends over two thirds of the radial dimension of the body and has an effective cutting length of at least twice that of the second cutting edge. Both cutting edges extend axially outward from the drill body and with at least a portion of the first cutting edge from its outer end area extending further axially outward than the second cutting edge outer end area.

REFERENCES:
patent: 3158922 (1964-12-01), Reese
patent: 3540323 (1970-11-01), Rishel
patent: 3816018 (1974-06-01), Hlocky
patent: 3963365 (1976-06-01), Shallenberger, Jr.
patent: 4072438 (1978-02-01), Powers
patent: 4124328 (1978-11-01), Hopkins
patent: 4131383 (1979-01-01), Powers
patent: 4149821 (1979-04-01), Faber

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