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August 2001

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Subject:
From:
Nancy Reynolds/MKT/HQ/KEMET/US <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 16 Aug 2001 11:49:09 -0400
Content-Type:
text/plain
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text/plain (110 lines)
I wince at the thought of operators picking up (POLAR) tantalum caps off
the floor and placing them by  hand.  Too much potential for placing in the
wrong polarity.  Tantalum caps don't like that much...

Nancy Reynolds





Dean Lillibridge <[log in to unmask]>@IPC.ORG> on 08/15/2001 02:57:32 PM

Please respond to "TechNet E-Mail Forum." <[log in to unmask]>

Sent by:  TechNet <[log in to unmask]>


To:   [log in to unmask]
cc:
Subject:  Re: [TN] Fallout


I agree with not using fallout if you can help it and certainly if it's
dropped to the floor, don't even chance it. I would, however, have little
reservation to a part that you can see and identify in the machine
(resistor
networks, marked I.C.'s, tantalum caps) when your assembly has to ship on
Friday and the customer has only sent you the exact amount required for the
build.  This is especially common with vibratory feeder-fed parts.  I've
had
several customers supply material in stick form and provide just what was
required by the build.  I'm not going to hold off revenue for a fallen
tantalum cap.   --Dean Lillibridge
                        NEWvENTURE TECHNOLOGIES


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of John Brewer
Sent: Wednesday, August 15, 2001 2:05 PM
To: [log in to unmask]
Subject: Re: [TN] Fallout


>>"are your operators consciencious about picking up/saving and
>>hand placing dropped parts?"

     Oh man....with all due respect, I'd surely not advise doing this. With
the size
of most SMT parts, the lack of marking, and the relatively cheap cost of
most of them
compared with the cost of diagnose> test> rework> retest, etc, I'd
generally
advise not ever doing this!

     If things are falling off in such quantities so as to make it
economically
feasible to reuse the parts, then the SMT process engineer should
investigate
the root cause and fix it, rather than try and reuse fallout....

     Rgds and good luck!
     John
-=-=-=-=-=-=-=-=-=-=--=--=-=-=-=-=
John Brewer
Square D Component Engineering
Raleigh NC

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