Dear Linda 
Sorry I've come to this a bit late.
This solution may not work for you but it worked for us.
We had a large area array connector (300 pins) on an asymmetric stack pcb. The PCB could not be made flat and warped excessively during 
the reflow process. By a shear fluke everything ended up soldered and flat on the prototypes. The customer would not believe there was a problem.
A member of staff brought in a camera with a telephoto lens. This was set up at the output end of the oven. I think a flash was used. The pcb went in connector first, fortunately it was on an edge. Photos were taken as the pcb went through the oven. We were able to measure the bow by scaling from the photos. The pictures were enough to convince the customer of the problem.
Regards
Rex


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: 26 October 2009 19:11
To: [log in to unmask]
Subject: Re: [TN] Steve Gregory

Hi Linda,

I have the pictures posted. Here are the links:

http://stevezeva.homestead.com/crx_pre-sample_2.JPG


http://stevezeva.homestead.com/val10crx_overview.JPG


http://stevezeva.homestead.com/crz_pre-sample_2.JPG


http://stevezeva.homestead.com/val10crz_overview.JPG


http://stevezeva.homestead.com/crx_sample_2-x150.JPG


http://stevezeva.homestead.com/Stella_pic1.JPG


http://stevezeva.homestead.com/Stella_pic2.JPG

As far as measuring warpage during reflow, I found this:

http://www.malcomtech.com/Electronics/products_srs2.html



Never used one, never seen one used, so I can't vouch for it. But it does look like a fun toy!

Steve

-----Original Message-----
From: Linda Langley [mailto:[log in to unmask]]
Sent: Monday, October 26, 2009 7:23 AM
To: Steve Gregory
Subject: RE: [TN] Steve Gregory

Steve,
We hope to get some information for Stella.



Linda,

I know that you are signed on TechNet
Could you please post question to all experts for me:

We are reflowing 50pins CF card SMT connector and having high rate of the lifted leads (they are gull wings leads). We measured leads coplanarity using CMM before reflow and it seems that all leads are meeting the spec. 
My guess is that the component body is bowing during reflow process (we are dong Pb free reflow with the peak of 234°C) causing lifted leads.
Somebody told me that there is a lab who can measure leads coplanarity during reflow cycle. Is anybody aware of such as test?
Thank you

Stella Neyman

-----Original Message-----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Monday, October 26, 2009 6:52 AM
To: Linda Langley
Subject: RE: [TN] Steve Gregory

Hi Linda,

Sure, send them my way...

Steve

-----Original Message-----
From: Linda Langley [mailto:[log in to unmask]]
Sent: Monday, October 26, 2009 6:05 AM
To: [log in to unmask]
Subject: RE: [TN] Steve Gregory

Steve,
Will you be able to post my pictures?

Linda Langley CIT
Training Specialist
Jabil Circuit
248-292-6176

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