Drilling printed circuit boards and entry and backing boards therefor
AssigneeHolders Technology PLC
InventorRudolf W. Weinreich
Life of this patent
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Abstract
The invention provides an entry board for use adjacent a printed circuit board during drilling therethrough comprising a drill lubricant distributed over the entry board. The board may comprise two or more separable laminar components (A, B) one of which has the drill lubricant. There is also provided a composite entry or backing board for use adjacent a printed circuit board during drilling therethrough, in which the adjacent faces of two laminar components of the entry or backing board are joined such that there is no relative slip during transportation, cutting and positioning, and they are separable by peeling them apart after use.
Claims16
An entry board for use adjacent a printed circuit board (PCB) during drilling therethrough, comprising a PCB-engaging sheet adapted to resist burr-formation during drilling, characterized in that said sheet is laminated with a non-metallic sheet over whose exposed surface is distributed a drill lubricant selected from the group consisting of graphite, molybdenum disulphide and polytetrafluoroethane.
A composite entry or backing board for use adjacent a printed circuit board during drilling therethrough, in which the adjacent faces of two laminar components of the entry board are joined such that there is no relative slip during transportation, cutting and positioning, and they are separable by peeling them apart after use.
An entry board, for use adjacent a printed circuit board (PCB) during drilling therethrough, comprising a PCB-engaging sheet adapted to resist burr-formation during drilling, wherein the sheet is laminated with a paper board having inner and outer surfaces, the inner surface of which is bonded to the PCB-engaging sheet, and the outer surface of which is coated with a film of dry lubricant.
Dependencies are inferred from the claim text.