Method for drilling circuit boards

Details Method for drilling circuit boards Method for drilling circuit boards

1973-06-18

1977-04-26

Simpson, Othell M.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

408 3, B23B 3500

Patent

active

040198260

ABSTRACT:
A metal foil, of a metal such as aluminum, is held in place over the drilling entry surface of a circuit board to be drilled. The drill thus first enters the foil which acts as a shield which takes burrs, pressure foot marks and particle marks which would otherwise be imparted to the surface of the circuit board. Further, the foil provides an even surface for the drill entry which tends to minimize drill wander and resultant hole mis-alignment which could occur if initial entry were to be made at the circuit board surface which is often uneven. After drilling has been completed, the foil is removed.

REFERENCES:
patent: 3700341 (1972-10-01), Block
patent: 3718404 (1973-02-01), Grinnell et al.

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