Single flute drill for drilling holes in printed circuit boards

Details Single flute drill for drilling holes in printed circuit boards Single flute drill for drilling holes in printed circuit boards

1995-04-04

1996-12-17

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

408230, 408704, 408705, B23B 5102, B23B 4114

Patent

active

055846173

ABSTRACT:
A drill bit for forming holes in a printed circuit board. The drill bit includes a first end including a tip for contacting the material of the circuit board. A second end of the drill bit is attached to apparatus for rotating the drill bit. A cutting edge is in the vicinity of the first end. A pressure pad is opposite the cutting edge. A flute winds upwardly about the drill bit in a helix. An angle of the helix with respect to a longitudinal axis of the drill bit varies continuously, wherein the angle is about from about 15.degree. to about 35.degree. in the vicinity of the first end and increases with increasing distance from the first end to at least from about 35.degree. to about 65.degree..

REFERENCES:
patent: 4561813 (1985-12-01), Schneider
patent: 4722644 (1988-02-01), Scheuch
patent: 5380133 (1995-01-01), Schimmer
American National Standards Institute, Publication -- IPC-DR-570, General Specification for 1/8 Inch Diameter Shank Carbide Drills For Printed Circuit Boards, Jan., 1979.

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