Method of drilling of through-holes in printed circuit board pan

Details Method of drilling of through-holes in printed circuit board pan Method of drilling of through-holes in printed circuit board pan

1991-07-29

1992-01-21

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

252 52A, 252 56R, B23B 3500

Patent

active

050824023

ABSTRACT:
A method of drilling a through-hole in a printed circuit board panel, which comprises placing a water-soluble lubricant sheet on one surface or each of two surfaces of a printed circuit board panel and drilling a through-hole through the printed circuit board panel, the water-soluble lubricant sheet being composed of a mixture of 20 to 90% by weight of a polyethylene glycol having a weight average molecular weight of not less than 10,000 with 10 to 80% by weight of a water-soluble lubricant and having a thickness of 0.05 to 3 mm.

REFERENCES:
patent: 4519732 (1985-05-01), Sutcliffe
patent: 4781495 (1988-11-01), Hatch et al.
patent: 4929370 (1990-05-01), Hatch et al.

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