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June 2008

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Subject:
From:
John Burke <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, John Burke <[log in to unmask]>
Date:
Thu, 5 Jun 2008 14:29:50 -0700
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text/plain
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text/plain (165 lines)
ROFL ....from the bay

 
 
John Burke
 
(408) 515 4992

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dwight Mattix
Sent: Thursday, June 05, 2008 11:12 AM
To: [log in to unmask]
Subject: Re: [TN] Stainless Steel Contamination Question - Source Revealed

should have been obvious to me -- but us being in CA and with the 
frequency of tongue piercing you can understand the confusion...

At 10:23 AM 6/5/2008, Leland Woodall wrote:
>Time's up, folks!
>
>I'm beginning to understand how I overlooked this initially...
>
>Try an ESD wrist strap band with interwoven elastic, nylon, and
>stainless steel fibers.
>
>They're now all off the floor and have been replaced with solid,
>Speidel-style bands.
>
>After I found the source, we queried the internet again and associated
>metallic contamination with ESD wrist strap bands.
>
>One of the results returned was an interesting article at
>
>http://www.nasa.gov/offices/oce/llis/0301.html
>
>It seems that NASA identified a similar problem back in 1993.  I'm now
>just wondering why these things are still being manufactured.  I'd
>always been under the assumption (yep, I know that's bad) that the
>working contact area on these bands was the small metal plate located on
>the rear of the snap.
>
>I'd never examined one of these under high magnification.  Low levels
>won't show you the true construction of the weave, as the stainless is
>quite small.
>
>If you're currently using these in your facilities I'd strongly suggest
>you consider a replacement.  These things are downright dangerous!
>
>Please let me know if you have additional questions or if I can be of
>further help.
>
>Have a great day!
>
>Leland
>
>
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
>Sent: Thursday, June 05, 2008 12:30 PM
>To: [log in to unmask]
>Subject: Re: [TN] Stainless Steel Contamination Question - Source
>Nailed!
>
>Was it a stainless steel brush being used to improve the Huntron's
>electrical probe contact?
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall
>Sent: Thursday, June 05, 2008 9:15 AM
>To: [log in to unmask]
>Subject: [TN] Stainless Steel Contamination Question - Source Nailed!
>
>Everyone,
>
>After checking every filter, every transfer belt, every reflow oven, and
>most every square inch of the building, I was able to identify the
>source of the 10 micron stainless steel that has been giving us such a
>headache.  Just in case anyone ever has the same problem, I thought I'd
>share the solution with our group.
>
>To refresh your memory, we were finding this stuff on top of components,
>and later inside our Huntron X-Y table inspection machines.  We did
>everything but take a hatchet to the Huntrons, and there was nothing
>found (of course).
>
>While one of the Huntron machine's operator was gone to lunch, I decided
>to check an item she had left behind on her workstation.  I took it to
>the lab, placed it beneath the microscope, and was astonished to find an
>identical match to our contamination woes.
>
>Before I let the cat out of the bag, does anyone want to venture a
>guess?
>
>Leland
>
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