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April 2004

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Subject:
From:
"Dehoyos, Ramon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 21 Apr 2004 05:55:21 -0700
Content-Type:
text/plain
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text/plain (87 lines)
       Hi Victor:
                  For the bow on IPC-TM-650, place board, four corners, touching a flat surface. Measure the highest point from the flat surface to the board. It should be less than the distance, usually along the length, times the percentage divided by 100.    Bow= (L X %)/100
                  For twist, place the board on a flat surface, three corners should touch the surface. Measure the distance between the flat surface and the fourth corner of the board.  It should be less than  2 times Diagonal times percentage divided by 100.  Twist= (2 X Diagonal X %)/100
                Regards,
                Ramon

> -----Original Message-----
> From: [log in to unmask] [SMTP:[log in to unmask]]
> Sent: Tuesday, April 20, 2004 5:00 PM
> To:   [log in to unmask]; Dehoyos, Ramon
> Cc:   [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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