I have to partially disagree with John's disagreement. While life is too
short (and expensive) to go around picking up every dropped component,
particularly unidentifiable ones, we have several taped components and
devices that are to expensive to lose in large quantities, either through
fallout or rejection. I gave a short  list to our assembly house of the
components over a certain value and size that they could recover easily and
reliably, and they have taken simple steps to effect this recovery. It has
saved quite a bit, especially on prototype/pre-production runs where the
attrition has been 20 times the actual usage for smaller components.

Regards

Pete Duncan



                    John Brewer
                    <brewerj@SQUA        To:     [log in to unmask]
                    RED.COM>             cc:     (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
                    Sent by:             Subject:     Re: [TN] Fallout
                    TechNet
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                    08/16/01
                    02:04 AM
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>>"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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