Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1990-02-15
1991-11-26
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Processes
Bit detachable
408 95, B23B 3500, B23B 4114
Patent
active
050678590
ABSTRACT:
A method for drilling very small diameter holes (0.005 inches or smaller) in a printed circuit board is described, employing an entry overlay sheet. The entry overlay sheet is a thin layer of a homogenous polymer material, having a thickness of 0.005 to 0.010 inches, but at least 1.5 times the drill diameter. To provide improved drilling characteristics the polymer may be filled with mineral filler particles such as talcum powder. The method of drilling the printed circuit board includes (i) placing a sheet of this entry material on top of the printed circuit board, and (ii) drilling through the entry material and printed circuit board in succession.
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Bishop Steven C.
Systems Division Incorporated
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