It is part of the formula in IPC-TM-650, Number 2.4.22, Bow & Twist (Percentage) Section 5.1.2, for determining the correct pin size used when inspecting for bow & twist.
Kim
-----Original Message-----
From: Victor G. Hernandez [mailto:[log in to unmask]]
Sent: Tuesday, April 20, 2004 2:00 PM
To: [log in to unmask]
Subject: Re: [TN] PCB Raw card Boe & Twist Tolerance
Ramon,
I have seen the 1.5% and 0.75% criteria before. What I am not sure
is % of what base number.
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dehoyos, Ramon
Sent: Tuesday, April 20, 2004 1:07 PM
To: [log in to unmask]
Subject: Re: [TN] PCB Raw card Boe & Twist Tolerance
Hi Victor:
It should definitely be less than 1.5% for THT and less than 0.75% for SMT, which that is what it is for a board after it has been soldered.
JStd.001B 9.2.3
Regards,
Ramon
> -----Original Message-----
> From: Victor G. Hernandez [SMTP:[log in to unmask]]
> Sent: Tuesday, April 20, 2004 1:02 PM
> To: [log in to unmask]
> Subject: [TN] PCB Raw card Boe & Twist Tolerance
>
> Steve,
>
> What has been your experience with measuring Bow & Twist on a raw
> card. Is there a RULE Of Thumb that can apply generically.
>
> Victor,
>
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