Mark,
Is there an etch resist (such as tin or tin-lead) plated also?  If so, can you re-work before final etch (after resist strip, I suppose)?  The re-work drilling should easily remove the etch resist, then the copper should completely etch out without a problem.

Patty
Patricia J. Goldman
PPG Industries, Inc.
724-274-3417
[log in to unmask]


-----Original Message-----
From: Mark Julstrom [mailto:[log in to unmask]]
Sent: Wednesday, January 16, 2002 3:12 AM
To: [log in to unmask]
Subject: [TN] rework


Broken tents caused NPT holes to be plated.   Re-work occurred back at drill to remove the copper from the hole wall, using a drill slightly larger than the original hole diameter. A thin layer of copper remains on the hole wall in some holes.  The drill size cannot be increased any further without violating spec.  Inspection will use an exacto knife to scrape out the remaining copper.  Are any better methods recommended for this type of rework?  There are approximately 20 panels, 10 holes per panel need to be scraped with exacto knife.

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