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July 2009

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Subject:
From:
Bev Christian <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bev Christian <[log in to unmask]>
Date:
Fri, 10 Jul 2009 16:24:01 -0400
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I contend this is old school and if you aren't measuring warpage at
reflow temperatures how do you know you aren't suffering from head on
pillow?

I suggest the term head in pillow be dropped because you don't actually
put your head IN a pillow.

Bev
RIM

PS Waiting for my Dewism.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
Sent: Friday, July 10, 2009 4:20 PM
To: [log in to unmask]
Subject: Re: [TN] Maximum Allowable Bow & Twist for PWB-PCB

IPC-2221 5.2.4 
...
Unless otherwise specified by master drawing, max bow and twist shall be
0.75% for boards that use surface mount components and 1.5% for all
other board technologies.
...
Values are measured as per IPC-TM-650 Method 2.4.22 


Genny Gibbard, P. Eng 
Manufacturing Engineer, Vecima
PTS dept. x.4229 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: July 10, 2009 2:15 PM
To: [log in to unmask]
Subject: [TN] Maximum Allowable Bow & Twist for PWB-PCB

What is the maximum allowable Bow & Twist value?   Not able to locate in
IPC-2221, 2222, & 6012A

Victor,

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