We apply IPC-6015 to much of our product, which requires 0.5%. After SMT,
there are a number of fixtures that require the board to be flat for vacuum
hold down or epoxy dispense processes.
Now tell me if I'm interpreting this wrong. I apply the 0.5% limit at
incoming, and apply the 0.75% limit after SMT. Sound correct?
Glenn
-----Original Message-----
From: Franklin D Asbell [mailto:[log in to unmask]]
Sent: Monday, October 28, 2002 8:31 AM
To: [log in to unmask]
Subject: Re: [TN] WARPAGE
Would that criteria also apply to "populated" boards? I believe he was
seeking data for populated boards...curious...would it matter after assembly
if they were warped or not???
Franklin
----- Original Message -----
From: Eric Castonguay <mailto:[log in to unmask]>
To: [log in to unmask] <mailto:[log in to unmask]>
Sent: Monday, October 28, 2002 10:14 AM
Subject: Re: [TN] WARPAGE
Pankaj,
check in IPC-6012 par. 3.4.4 Bow & Twist. The printed board shall have a
maximum bow & twist of 0.75% for boards that use SM components and 1.5% for
all other boards. Also, see test method 2.4.22 described in the "IPC-TM-650
test methods manual" on how to measure it.
Eric Castonguay, Eng.
Manufacturing Engineering
www.Hyperchip.com
Montreal, Canada
T. 514 906 2409
F. 514 906 2501
-----Original Message-----
From: Karnwal, Pankaj [ mailto:[log in to unmask]
<mailto:[log in to unmask]> ]
Sent: Monday, October 28, 2002 02:02
To: [log in to unmask]
Subject: [TN] WARPAGE
> Hi TechNet
>
> Can any body give me the acceptable range of PCB {Populated } For
> Warpage, { Both Throughole And SMD And MIX components} .And how we can
> measure it. Also tell that what IPC states about this.
>
>
> With regards
> Pankaj Karnwal
> Quality Assurance Ext. 211
> BESL A-4,Sec-5 NOIDA , 201301, INDIA
> e mail : < mailto:[log in to unmask]
<mailto:[log in to unmask]> >
> Barco, innovators in image processing
>
>
>
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