Drill bit and step feeding method

Details Drill bit and step feeding method Drill bit and step feeding method

1997-07-23

1999-03-30

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408704, B23B 5102

Patent

active

058880364

ABSTRACT:
An improved drill bit for high speed, small diameter drilling of printed circuit boards uses flute/land ratio tapering in combination with the appropriate web thickness and point, cutting or flute angles to obtain high quality, accurately positioned holes. In one embodiment, the web thickness at the tip is 15% of the drill diameter, the flute/land ratio is 2.0, the tip angle is 130.degree., the second cutting angle is 20.degree., the third cutting angle is 30.degree., the flute angle is 32.degree., the relief groove depth is 0.001", body length is 0.256" and the distance between the body end and the flute end is 0.01". Such a bit is used in connection with an air jet cooling/cleaning system and a step feed drilling method wherein the first step is between four-six times drill diameter, the second step is between two-three times the drill diameter, and the third step and subsequent steps are between 1.5-2.5 times the drill diameter.

REFERENCES:
patent: 4080093 (1978-03-01), Maier
patent: 4561813 (1985-12-01), Schneider
patent: 4759667 (1988-07-01), Brown
patent: 4872787 (1989-10-01), Arai et al.
patent: 4915550 (1990-04-01), Arai et al.
patent: 4932815 (1990-06-01), Krauss

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