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May 2013

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From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Thu, 9 May 2013 15:38:17 +0000
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LOL!

From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Thursday, May 09, 2013 9:49 AM
To: Stadem, Richard D.
Cc: TechNet E-Mail Forum
Subject: RE: [TN] Automating Conformal Coating

Well now, you are being a bit closed minded here. Components on boards are only an issue if they have an underside or bottom side.  We only use parts with tops and sides.  And connectors are only a problem if they have electrical contacts.

Dewey, does the IPC-T-50 contain a definition for "hissy fit"?  I REALLLLLLLY want to use that in a few of my documents!!!

Doug Pauls



From:        "Stadem, Richard D." <[log in to unmask]<mailto:[log in to unmask]>>
To:        TechNet E-Mail Forum <[log in to unmask]<mailto:[log in to unmask]>>, "[log in to unmask]<mailto:[log in to unmask]>" <[log in to unmask]<mailto:[log in to unmask]>>
Date:        05/09/2013 09:04 AM
Subject:        RE: [TN] Automating Conformal Coating
________________________________



Don't put any parts on the board. Parts are bad when conformal coating. Also, if you do have to put parts on the board, don't put any connectors on. Connectors are hard to mask and they never want coating on them. But if you really must have parts and connectors, don't require coating to be on them. But if coating must be on them, allow the coating to be peeled and/or bubbled and if a little bit is missing here and there, let's not get all hissy-fit about it. Nobody's perfect.
There, that should do it.  :-)


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Thursday, May 09, 2013 7:41 AM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: [TN] Automating Conformal Coating

Good morning all,

Another conformal coating related question.  What, from an assembly point of view, would you tell a board designer are good design practices to make an assembly coatable from an automated standpoint.

I think we would all agree that having an assembly with no keep out zones and a constant height for components to be the ideal.  The more holes we poke in the film and the farther we get from the ideal, the less we can automate coating.

So, what would you tell a designer to do?

Or, to put the shoe on the other hand, what kinds of things should they NOT do, or bad practices to avoid?

And, yes, I know It Depends.

Doug Pauls


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