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January 2013

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Subject:
From:
Steve Smith <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Steve Smith <[log in to unmask]>
Date:
Mon, 28 Jan 2013 09:06:34 -0500
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I haven't done a flex design in years but I still keep a copy of Minco's
design guide handy just in case.

http://www.minco.com/~/media/WWW/Resource%20Library/Flex/Minco_FullFlexD
esignGuide.ashx

My regards,
Steve Smith
Project Engineer
Staco Energy Products Co.
"Your tailored power solutions provider"



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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Monday, January 28, 2013 8:49 AM
To: [log in to unmask]
Subject: Re: [TN] Flex design guidelines / assembly guidelines

Wayne,

   You make a statement of "GRAIN DIRRECTION and how critical it is to
functionl assembly but you don't explain how to accomplish that task".
Are you at liberty to share your valued experience?

Victor,


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Thayer
Sent: Monday, January 28, 2013 7:09 AM
To: [log in to unmask]
Subject: Re: [TN] Flex design guidelines / assembly guidelines

I don't have help for you in finding sources for design guides, but
after designing/procuring highly stressed (in terms of bend radius) flex
designs over the past 10 years, I can tell you that it would be a very
rare fabricator who knows how to tell the grain direction of the RA
foil:  Out of 18 orders of flex, 9 have come in with the grain in the
wrong direction!  After I educated those fabricators, they MAY now be
able to identify it, but I never trust them.  If you need to push things
at or beyond standard limits, count on learning to read the grain and on
the extra time required to have a fabricator remake boards.  One
fabricator I used last year made the initial delivery in May.  By the
time they agreed the grain was wrong and they re-made the boards, it was
October!  They had purchased the material from DuPont.  DuPont also did
not know how to read grain.  DuPont then went to their foil supplier.  I
have my doubts on whether any of the "education" stuck!

Wayne Thayer

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Coburn
Sent: Monday, January 28, 2013 7:45 AM
To: [log in to unmask]
Subject: [TN] Flex design guidelines / assembly guidelines

T-netter's;
Can anyone provide direction regarding design and assembly guidelines
for flexible PCB's / PCA's?
Thanks in advance for your responses.
Rob Coburn 		 	   		  

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