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November 2005

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Subject:
From:
Gary Camac <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Gary Camac <[log in to unmask]>
Date:
Fri, 18 Nov 2005 15:50:59 -0600
Content-Type:
text/plain
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text/plain (102 lines)
I do not have that capability.  And, since we haven't had a mis-pick since
vibrating the reel, I feel the evidence may be destroyed.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
Sent: Friday, November 18, 2005 3:02 PM
To: [log in to unmask]
Subject: Re: [TN] Tin whiskers on 0402's in the reel.

Gary,

could you post some pictures? It would be interesting to see the one with
the filament on it.

Thanks,
Ioan

> -----Original Message-----
> From: TechNet [SMTP:[log in to unmask]] On Behalf Of Gary Camac
> Sent: Friday, November 18, 2005 3:57 PM
> To:   [log in to unmask]
> Subject:      [TN] Tin whiskers on 0402's in the reel.
>
> Good afternoon,
>
>
>
> We have had a problem today with a reel of 0402 resistors where the
> placement machine would not pick some of the parts out of the tape
(paper).
> A part I examined would not fall out of the pocket when the feeder was
> turned upside down.  I examine the part sitting in the pocket and it
> appeared to be jammed into one corner.  After some tapping on the feeder
the
> part dislodged.  When I examined the part under a microscope, I noticed a
> filament attached to the bottom of the part starting at the corner of the
> electrode.  The following part in the tape would, likewise, not fall out
> until persuaded.  This part fell into my hand and when I examined it under
> the scope I could see a filament lying beside it in my palm.
>
>
>
> These parts are a 2002 date code.  Tin whisker?  Anyone seen this before?
>
>
>
> I took the reel on components to our environmental test lab, bolted it to
> the sinusoidal vibration table and shook for about a minute.  We then
> reinstalled the reel on the placement machine and the picking problem went
> away.  Interesting stuff for a Friday afternoon.
>
>
>
> Gary Camac
>
> Senior Mfg. Eng.
>
> Dickey-john Corp.
>
>
>
>
>
>
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