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September 1998

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Subject:	BOW AND TWIST
From:	Donna Perry <[log in to unmask]>
Reply To:	DesignerCouncil E-Mail Forum.
Date:	Tue, 15 Sep 1998 18:23:42 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (45 lines)

Hello,

What does IPC-D-275 state concerning pcb flatness (bow and twist)?

We are producing a panel (12"x18") of small, unique boards.  The boards
are intended to be surface mounted to larger boards.

I feel a note should be added to the fabrication drawing to specify the
acceptable flatness:

     1) What is the acceptable flatness for boards intended for
automated assembly of surface mounted components?  Would this be
applicable to our boards eventhough they are  the intended
component?
     2) Should the flatness requirement be applied to the entire
panel         or to the individual boards?  (The boards will be shipped
still         in the routed panel.)

TIA, Donna
RadioConnect Corporation
Culver City, CA

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