Hans,

I'd agree that the large delamination may be a result of the routing
process, but the smaller laminate voids immediately above and below the
large delamination look like real laminate voids to me. Also, if that copper
is 1 oz, it looks like the laminate voids exceed the 0.08mm limit for class
2 and 3.

To avoid this kind of messy question, I like to make the edge of my coupons
right through the middle of a hole. That way, the outside holes can be
discounted, but anything inside of them is fair game.

David V. Smith
QA/FA Lab Technician
Benchmark Electronics, Inc.
Direct: (507) 453-4892
[log in to unmask] <mailto:[log in to unmask]>

                -----Original Message-----
                From:   Hinners Hans Civ WRALC/LYPME
[mailto:[log in to unmask]]
                Sent:   Wednesday, July 26, 2000 3:42 PM
                To:     [log in to unmask]
                Subject:        [TN] IPC-A-600F  Section 3.1.1 Define Zone B
Delamination

                Hi All,

                Interesting discussion going on in our Inspection area
regarding IPC-A-600F
                Section 3.1.1.

                Is the outer edge of the coupon considered Zone B?

                I think of Zone B being between the holes and nowhere else
but hadn't really
                thought on it until now.  We have a laminate void that
(probably)
                contributed to a delamination when the coupon was routed.
The Inspectors
                are gonna pull another coupon tomorrow but I'm interested in
what y'all have
                to say.

                Here's a pic "lam void.jpg"


<http://www.driveway.com/share?sid=a8f3cb1d.96df8&name=Pictures>

                (If this picture is viewable then Friday ought to be another
Steve Day!)
                I look forward to everyone's replies over my morning coffee.

                Hasta!

                Hans

                ~~~~~~~~~~~~~~~~~~~
                Hans M. Hinners
                Materials (Process & Manufacturing) Engineer
                Warner Robins Air Logistics Center
                Avionics Production Division
                Manufacturing Branch
                380 Second Street, Suite 104
                Building: 640, Mail Stop: LYPME
                Robins AFB, GA 31098-1638
                Voice: (912) 926 - 1970 Fax: (912) 926 - 7164
                mailto:[log in to unmask]
                http://www.robins.af.mil


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