Acceptable Quality Level


                        P.  Lance Mayes CIT
                        Mfg. Trainer



Pete menuez <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
04/28/05 08:26 PM
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TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Pete menuez <[log in to unmask]>


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Re: [TN] Oval via holes






Hi  Ryan,

First - What does AQL stand for?

To your problem....You didn't mention whether this is a single/double
sided
board - or multilayer. This is kind of important.  I would find it hard to
believe that the fabricator would actually put a panel back on the drill-
If
anything they might redrill some holes because of a broken drill bit.
Sometimes when a shop finds a broken bit they will back up a couple holes
and redrill those holes plus the hole with the broken bit.

Ask the board shop what happened to the panel. It's (in my opionion) your
right to know.  Ask to see the traveler to see if there was any rework...

Good luck - and what is AQL...

Pete





>From: Ryan Grant <[log in to unmask]>
>Reply-To: TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
>To: [log in to unmask]
>Subject: [TN] Oval via holes
>Date: Tue, 26 Apr 2005 09:24:11 -0600
>
>Hi Technetters,
>
>Our AQL department discovered some boards that they thought might be
>annular ring violations.  Although they are admittedly ugly, the drilled
>hole did not break out of the annular ring so they are in spec.
>However, I noticed the drilled hole is oval shaped.
>
>It appears a drill bit may have broken and the panel was "re-drilled" to
>ensure all holes are there.  Apparently, by random chance, some via
>holes were not drilled in the exact same location, causing an oval hole.
>In one hole, the second drill is offset from the first by 3/4ths the
>diameter of the first drill.
>
>Now I'm not sure what to make of it.  What are your opinions?  A little
>weird looking but just fine?
>
>Thanks,
>Ryan Grant
>
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