Method of drilling holes in printed circuit boards with backup b

Details Method of drilling holes in printed circuit boards with backup b Method of drilling holes in printed circuit boards with backup b

1996-03-18

1998-02-10

Gallagher, John J.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

1563074, 156323, 269289R, 408 87, 428217, 428525, 428530, B23B 3500

Patent

active

057161682

ABSTRACT:
A back-up board for use in drilling holes in printed circuit boards is disclosed. The inventive back-up board comprises outer layers of paper impregnated with a high-density resin, and a core consisting of alternating layers of paper impregnated with low-density resin and dry paper.

REFERENCES:
patent: 2587171 (1952-02-01), Knewstubb et al.
patent: 4288491 (1981-09-01), Surzhenko et al.
patent: 4853273 (1989-08-01), Harris

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