Drill

Details Drill Drill

1988-05-18

1989-12-26

Howell, Daniel

Cutting by use of rotating axially moving tool

Tool-support with means to permit positioning of the tool...

Pivotable tool

408194, 408211, 408224, 408227, 408713, B23B 5102

Patent

active

048894559

ABSTRACT:
A drill for stack drilling comprises a drill body, a central cutting insert, and a peripheral cutting insert. The inserts have active cutting edges arranged such that the drill successively cuts radially outwardly from the center of the drill in order to avoid the formation of break-out slugs. The active cutting edge of the central insert has three cutting edge portions forming obtuse angles with one another. The radially innermost one of those cutting edge portions is shorter than each of the other two cutting edge portions.

REFERENCES:
patent: 3963365 (1976-06-01), Shallenberger, Jr.
patent: 4293252 (1981-10-01), Kress et al.
patent: 4563113 (1986-01-01), Ebenhoch
patent: 4676702 (1987-06-01), Reinauer

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