*** Resending note of 02/14/97 01:48

Hey Mark,
   Maybe this will give you some ideas.
My experience on this transition was to incorporate a magic set of tooling
holes. Majority of tooling jobs I would try to fit on a 12 X 18.
Or shear the larger panels in half before rout.
Since I serviced the machines also, the magic number used
to calibrate the machine was my Standard know location.  I would
calculate all the panel "work zeros" to this location or a corner tooling
hole OUT of the thieving area.
I drilled one set of fixtures and every odd job that came in to
be fabricated dropped on the machine.   With respect to manufacturing
tolerance!!  I finally went to a larger tooling pin since our AI machines
used 5/32, and too, the distance between pins foresaw greater
tolerance.
 As far as the breakaway I researched many different options.  It depends
on the board size.  I had good luck with .0938 router bits and
.040" holes spaced .050" or .060" center to center.

To: [log in to unmask]
From: "Mark W. Spitnale" <[log in to unmask]>
Subject: PCB Panelization



Can you help?,

We are a High Mix (120 SMD/Mixed  and 80 LTH), Low Volume board shop that's
using 2 standard PCB widths to reduce our machine set-up requirements.  We
are investigating our panelization techniques and would like to here from
some others and see how they have approached the problem.

Do other Med - High Mix companies try to standardize on panel width?

What panel width(s) do you use as standard(s)?

Do other companies build loose PCB's to because of the associated problems
with board cost / yield when panelization?

If building with loose boards, how do you tool the line (assuming an inline
automated handling system from machine to machine)?

Can anyone share their experiences in building single or 2-up panels with a
breakaway Tab / Rail that contains all of the tooling features (holes)
needed for automated handling?



                                Mark Spitnale






                                Hughes Defense
                                (219) 429-5992
----------------------------------
Mark W. Spitnale                Phone: (219) 429-5992   Fax: (219) 429-
Hughes Defense Communications                           Mail Stop: 25-31
1010 Production Road, Fort Wayne, IN 46808-4106
Email: [log in to unmask]

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