DT,

We have routed assemblies for many years.  We have not seen any negative effects
of routing wrt vibration.  We are directing our designs towards V-notch -
automatic separation.  We do not break apart unsupported cards - due to stress
that can be caused by bending forces.

Hope this helps.

Mary Smoot
Process Engineer
Lexmark Electronics
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[log in to unmask] on 01/28/99 04:25:38 PM

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To:   [log in to unmask]
cc:    (bcc: Mary Smoot/Lex/Lexmark)
Subject:  [TN] PWA Routing




TechNet,

Opinions requested.

I have some PWAs (assembled) that had rails added to the PWB for processing
purposes.  These were to be removed but were not.  The CM indicates they
will route them off.

I am very concerned about the effect vibration will have on the components
and general ESD/Debris control relative to the PWA.

IPC-D-279 mentions vibration and shock as things to be aware of, and in
Section 7.7 says that either
"snap" tabs or "full board routing" can be done.

Is routing a normal/acceptable method given the vibration of the PWA?

Any info appreciated.

Tks.......DT

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