Stacking at drilling is common. Hole quality, registration and ability to
maintain hole exit location are key.  What to stack depends upon your internal
spacing and the quality and capability of you drill tools.  2-3 high should
work on product with wide spacing between hole and feature.

Jim Herard
IBM Microelectronics Endicott
Quality Engineering
---------------------- Forwarded by Jim Herard/Endicott/IBM on 05-30-97 10:23 AM
 ---------------------------

        Robisan1 @ aol.com
        05-29-97 08:27 PM
Please respond to [log in to unmask] @ internet


To: technet @ ipc.org @ internet
cc:
Subject: fab: drilling

One of my customers has a question regarding stack
height for multilayer printed boards for drilling.

When I was building boards, I drilled only one at a time.
However, we were not producing high volumes of boards
and all I can think of is why I wouldn't want to do it.

Do any of you have experience drilling more than one
panel of multilayers at a time?  What are your criteria
for determining when to stack and how many?

Thanks,
Susan Mansilla
Robisan Lab

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