Drill having a pointed center cutting edge formed on a fluted sh

Details Drill having a pointed center cutting edge formed on a fluted sh Drill having a pointed center cutting edge formed on a fluted sh

1997-05-01

1998-09-15

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408227, B23B 5102

Patent

active

058070419

ABSTRACT:
A drill includes a shank having a tip with two cutting inserts located in a main plane. The cutting inserts have short central cutting edges oriented in a secondary plane. The edges form a pointed center cutting edge for the purpose of entering a workpiece and thereby centering the drill. In the shank two helical flutes are provided, the flutes extending from the tip to the base end. The flutes are located diametrically opposite each other and are separated by two helical lands. The flutes lie in a flute plane that extends at an angle of 90.degree. to the land plane. The secondary plane forms an angle of about 90.degree. to the orientation of the land plane when viewed at the base end of the shank.

REFERENCES:
patent: 4222690 (1980-09-01), Hosoi
patent: 4565473 (1986-01-01), Hosoi
patent: 4687387 (1987-08-01), Roos
patent: 4961672 (1990-10-01), Lindberg
patent: 5312209 (1994-05-01), Lindblom
patent: 5423640 (1995-06-01), Lindblom et al.
patent: 5429458 (1995-07-01), Tukala et al.
patent: 5478176 (1995-12-01), Stedt et al.

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