Steve,
Nice try and it's looks great considering. But, either you are not near the
center of the hole or the plating shop did an amazing job, looks like there
is a lot of copper in the hole but more likely you need to sand down
further. The lab people will have a better idea. Also the check the idea
that you don't have contact from the hole to the pad you will need to micro
etch the metal so the crackes or separations will show up, the metal may be
smeared over the defect. Really sharp pictures.
Chuck Brummer
-----Original Message-----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Tuesday, September 13, 2005 2:44 PM
To: [log in to unmask]
Subject: Re: [TN] raised vias...I did a "Okie" cross-section
Hi All!
I have a local shop here do a lot of cross-sections for us, but I couldn't
take
the board over to them until tommorrow. But I was so curious to take a look
at the bumps, or "raised vias", I decided to do what I could, to see what I
could.
We're not set-up to do cross-sections here (that may change in the future),
but I took a dremel tool and got close to where I wanted to look, then
started
using finer and finer grit wheels. Then I used an exacto knife and
carefully
scraped material away until I was able to see how things looked at the
raised vias. This was done under a microscope, and I mean it was done
carefully.
I know it's not as good looking as what a real cross section would look
like,
but it does give an idea of how things look. Go to:
http://www.stevezeva.homestead.com and look at "Okie Cross-section".
I still don't know why I have the bumps...they look like they're solid
copper.
Kind regards,
-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
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