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Reply To: | TechNet E-Mail Forum. |
Date: | Wed, 18 Nov 1998 17:03:21 -0800 |
Content-Type: | text/plain |
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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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