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Method for Beveling Edges of Populated Printed Wiring Boards And Beveling Machine

IP.com Disclosure Number: IPCOM000100939D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 3 page(s) / 81K

Publishing Venue

IBM

Related People

Davis, WW: AUTHOR [+4]

Abstract

Disclosed is a method for beveling two recessed edges and four surfaces of Printed Wiring Boards (PWBs) at the same time.

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Method for Beveling Edges of Populated Printed Wiring Boards And Beveling Machine

       Disclosed is a method for beveling two recessed edges and
four surfaces of Printed Wiring Boards (PWBs) at the same time.

      Normally a shaving tool is used to bevel only one edge and two
surfaces of a PWB at the same time (Fig. 1).

      This method requires a special (Fig. 2), "V" shaped, carbide
shaving tool which is expensive, difficult to sharpen, has a short
life time and a tendency to damage beveled edges when not sharp.
Adjustment of the tool is time consuming and critical for bevel
quality.  Scraps created by this tool are large and difficult to
handle.

      The new method (Figs. 3 and 4) permits beveling PWBs with two
recessed edges, and four surfaces, simultaneously, edge to edge and
no damage to surfaces or contacts of recessed areas.

      This method was used to design a semi-automatic, programmable
beveling machine which is twice as fast as the previous method, pro
duces a consistently smooth 0-45 degree bevel on conventional plug-in
PWBs with up to a one-inch depth recess and PTH/SMT components in
place.  It is a self-feeding machine capable of bevel edges of PWBs
made of FR-4 fiberglass .032-.125 inch thick.

      Four industry standard, high speed carbide rotary tools provide
a smooth finish of four surfaces with scraps of powder consistency
which are easily removed by a vacuum nozzle assembled at close
proximity to the tip of each t...