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| From [log in to unmask] Wed Feb 28 15: |
50:59 1996 |
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We always design using the Maximum Material Conditions (MMC). In doing so,
I can just use the values of X, Y and C specified. One note of caution,
always check that the mechanical dimensions specified by the supplier match
those that the land pattern was developed around.
At 12:40 2/28/96 EDT, Jeff Seeger wrote:
>
>
> Pat,
>
> Good to hear your endorsement of the IPC land patterns. We have
> found good acceptance of them in the general assembly community.
>
> I'm always glad to hear of "paths to higher yield". Given your
> testimonial I'd be curious to hear more specifically how you've
> implemented the spec, though. In your interpretation of IPC 782
> (I assume it's rev A), do you use the nominal values presented or
> do you envelope broader tolerances? Perhaps you start with the
> nominals and adjust for your process within the broader tolerances?
>
> I have found this particular version to be a bit subject to the
> user. Nominal values are aggressive compared to factory specific
> specs that we also support, while the full envelope presented is
> too conservative for complex products. Is your interpretation
> part of your success?
>
> Long live TechNet!
>
> Jeff Seeger Applied CAD Knowlege Inc
> Chief Technical Officer Tyngsboro MA 01879
> [log in to unmask] 508 649 9800
>
>
>
-Pat-
-------------
Patrick McGuine
Nicolet Instrument
[log in to unmask]
(608) 276-6334
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