Method for drilling circuit boards

Details Method for drilling circuit boards Method for drilling circuit boards

1979-07-30

1982-01-19

Bilinsky, Z. R.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

83658, B23B 3500

Patent

active

043114199

ABSTRACT:
An entry material for use in drilling circuit boards to avoid marring of such boards comprises a wood pulp-glass composite substrate having aluminum foil bonded to the opposite surfaces thereof. This entry material is relatively economical and has a stiffness sufficient to avoid upward bending or "oil canning" when pressure feet spaced from the drill are employed to hold the workpiece during drilling and further has enough strength to withstand high torsional drill forces with drills operating for high rates of material removal. The double layers of foil separated by the low heat conductive substrate material affords a pair of heat sinks which more effectively can carry away heat from the drill.

REFERENCES:
patent: 3700341 (1972-10-01), Block
patent: 4019826 (1977-04-01), Block

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