Anyone attending IPC MidWest next week can
can hear a presentation by iNEMI/IPC on "bow 
and twist" in the Imagination Room at 11:00am

Jack

-=-=-=-

from John Perry:

I wanted to let all of you know that IPC has signed up as a member within an 
iNEMI project on printed board coplanarity (bow and twist) that we anticipate 
will result in industry recommendations for changing the bow and twist 
acceptance criteria in IPC-2221 and IPC-6012, in addition to recommendations 
for new sampling and measuring requirements.

There will be an open presentation on this subject at IPC Midwest 2008 on 
Wednesday, September 24th from 11AM – 12PM in the Imagination Room of 
the Renaissance Hotel and Convention Center.  We will have members of the 
iNEMI project give an overview of the project’s scope and provide information 
on how companies who are not already within iNEMI membership can 
participate.

Our IPC-2221 and IPC-6012 task groups have long struggled to address the 
issue of bow and twist in our documents – it seems that there is always 
something else that takes over (lead-free, wrap plating, surface finishes, 
etc.) – but I am excited that there is a project underway to pull industry data 
together that can yield recommendations that our groups can review for future 
revisions to the IPC standards.

 
. 

Subject: Re: Bow and Twist Measrement 
From: Lum Wee Mei 
Date: Fri, 12 Sep 2008 21:55:02 +0800 

If I did not remember wrongly, IPC intend to update the std to include 0.5% if 
the board consist of BGAs.
 
Thanks and Regards,
~ Wee Mei ~


 

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