Thanks to everyone for sharing.
What about Bow & Twist on Post reliability testing, T/C?
Does the 1.5% still applied for SMT/PTH assemblies?
The assembly is nearly a square form factor.
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of ALLEN, LOA
Sent: Friday, July 10, 2009 3:31 PM
To: [log in to unmask]
Subject: Re: [TN] Maximum Allowable Bow & Twist for PWB-PCB
Ref IPC-A-610D, pg 10-15, section 10.2.7
Acceptable - Class 1,2,3
Bow an twist does not cause damage during post solder assembly operation
or end use. Consider "Form, Fit and Function" and product reliability.
Note: Bow and twist after solder should not exceed 1.5% for through-hole
and 0.75% for surface mount printed board applications
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Friday, July 10, 2009 1:15 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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