John,
When we run into this problem, and we don't have time for the supplier to
re-make the boards, we use Kapton tape across the deep v cuts and board
"stiffeners", i.e. "U"-shaped metal strips that are placed on the leading
edge of the panel as it travels through the wave. Normally this provides
enough stiffness to allow you to run with some success across the wave.
However, you will still get some sagging due to gravity (and the number of
heavy parts on the boards). You may have to play with the wave height to get
your best result. Rest assured that you will still have rework since the sag
may cause insufficient soldering toward the outer edges of each panel if you
adjust the wave peak for it.

Good luck! Best solution is for a re-make of the boards...
Dale Ritzen
Quality Manager
Austin Manufacturing Services

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of John Wheeler
Sent: Tuesday, March 28, 2006 6:46 AM
To: [log in to unmask]
Subject: [TN] V-Score too deep repair method


We had a PCB shop score some of our board too deep and they are falling
apart on our assembly line. The board shop admits fault but want us to
still use them. They have come up with a solution to use Super Glue or
Epoxy A-B pate on the scores to strengthen the scores. I have concerns
that the glue/paste will weaken when going thru our wave with temperatures
of 250F. At what temperature will the glue/paste change state? Does it
emit vapors, does it dry up and flak off? Will it contaminate the wave?
Anyone have any experience or thoughts on this?

TIA,

John

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