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November 1998

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Subject:
Re: True Position and Registration on Fab
From:
Joseph Fjelstad <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 20 Nov 1998 07:41:36 -0800
Content-Type:
text/plain
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text/plain (60 lines) 
Ken,

I suspect that you know this and ahve simply converted to an approximation
but all component leads are now in metric so a 40 mil pitch does not exist
but a 1.0mm does. It makes a difference...

Regards,
J. Fjelstad

At 05:03 PM 11/18/98 -0800, you wrote:
>Fab Gurus,
>We are designing board with a 40 mil BGAs first time and the fab will be
>having 10 mil plated finished holes on it. I opened up an old existing
>drawing of different non-BGA board and now I have couple of questions after
>reading my fab drawing notes.
>
>(1) Fab note: All holes to be within .006" true position on the diameter
>with respect to original data.
>Question: What is true position and why .006"? How to decide this number?
>
>(2) Registration: Front to back to be within  +/-.005". Can anyone explain
>what is registration and why .005"? Who can decide this #, is it fab house's
>processing capability?
>
>re,
>Ken Patel
>______________________________________________________
>Ken Patel                       Phone:  (408) 490-6804
>1708 McCarthy Blvd.             Fax:    (408) 490-6859
>Milpitas, CA 95035              Beeper: (888) 769-1808
>
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