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Profiling Printed Circuit Cards Out of Panel Format Constructed of Laminated Copper-Invar-copper Stiffener And Printed Circuit Cores

IP.com Disclosure Number: IPCOM000120768D
Original Publication Date: 1991-Jun-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 80K

Publishing Venue

IBM

Related People

Fetcho, TG: AUTHOR [+2]

Abstract

This article describes a method of profiling printed circuit cards out of a panel format 1 constructed of printed circuit cores, laminated to a copper invar copper stiffener, also refer to cross section 2, when a lubricant cannot be used for cooling purposes. The method is as follows:

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Profiling Printed Circuit Cards Out of Panel Format Constructed of
Laminated Copper-Invar-copper Stiffener And Printed Circuit Cores

      This article describes a method of profiling printed
circuit cards out of a panel format 1 constructed of printed circuit
cores, laminated to a copper invar copper stiffener, also refer to
cross section 2, when a lubricant cannot be used for cooling
purposes.  The method is as follows:

      The first step is to perforate the perimeter of the printed
circuit cards by drilling a series of holes 3.  The drill bit is
normally smaller in diameter than the profiling bit to be used, e.g.,
the drill bit in this case is 0.102" in diameter and the holes are
drilled on 0.110" centers. This leaves a web to hold the part in
place prior to finish profile of the part.  The rpm of the drill is
set for 20.000 rpm and infeed rate is 20" minute.

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      The second step is to finish profile 4 the parts from the panel
1.  In this step we use a 0.125" diameter 2 flute router bit with a
drill point.  The purpose of the drill point is to allow a plunge cut
into an existing drilled hole prior to starting the finish profile
cut.  The end result is 5.  The rpm of the router bit is 20.000 rpm
and the feedrate is 4"/minute.  The drill bit and the router bit are
made of tungsten carbide.