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March 2000

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Subject:
From:
"Noble, Ed" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 14 Mar 2000 11:11:44 -0500
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correct, if 20% or more of the trace is missing, for whatever reason, i
would consider it a reject.  definitely communicate back to your vendor on
this issue (i'm sure you will), especially is its repeating itself panel
after panel.  sounds like contamination or a flaw in the artwork..

-----Original Message-----
From: Stephen R. Gregory [mailto:[log in to unmask]]
Sent: Tuesday, March 14, 2000 10:52 AM
To: [log in to unmask]
Subject: [TN] Etched "Notches" or "Nicks" in copper traces


Hi ya'll!

I gotta board here that has a problem with the traces, it looks something
like this:


                      Nick in the Trace
                              |
                             V         ___
________________    ___,/      \
                            \_/               | <-------This is supposed to
be a via..
______________________,       |
                                       \___/

(I hope my "ascii cad" conveys what I'm trying to show) Reading the
IPC-A-600F at 2.10.1.1 Conductor width it says for class 2 and 3 it is
acceptable when;

"Any combination of isolated edge roughness, nicks, pin holes, and scratches
exposing the base material that reduces the conductor width by 20% of the
minimum value or less."

So I'm reading this correctly, if the nick reduces the trace width by more
than 20% of the overall trace width, it is a reject...right? This "nick"
seems to have been etched like this...it's at the same place on the same
board that's in a 4-up panel. The other 3-boards in the panel don't have
this
"nick". Booger on the artwork or something huh?

Just want to be sure...

-Steve Gregory-

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