Spiral drill

Details Spiral drill Spiral drill

1994-02-28

1995-07-04

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

408230, B23B 5102

Patent

active

054294584

ABSTRACT:
Spiral drill comprising a cylindrical part with two chip grooves (15,16) and a principal maximum stiffness direction (22,23), an attachment part (30) with larger diameter connecting to the cylindrical part at a transition (14), and a tip with indexable cutting inserts (12,13), the chip grooves spirally encircling the cylindrical part to make the principal direction turn an angle C which is at least 110 degrees and at most 125 degrees.

REFERENCES:
patent: 2897695 (1959-08-01), Winslow
patent: 4149821 (1979-04-01), Faber
patent: 4230429 (1980-10-01), Eckle

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