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March 2012

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Subject:
From:
Jack Olson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Jack Olson <[log in to unmask]>
Date:
Mon, 26 Mar 2012 10:48:28 -0500
Content-Type:
text/plain
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text/plain (66 lines)
Never say Never,
cause we done did it!

but that was 16 years ago...

(I was just remarking on my first TechNet post,
not trying to start a discussion about it)

seeya,
Jbro

.
On Mon, Mar 26, 2012 at 9:36 AM, Stadem, Richard D. <
[log in to unmask]> wrote:

> One cannot "grind" soldered component leads, due to ESD issues. Do you
> mean cut, such as with a Q-cutter or equivalent tool?
> Prior to soldering, leads can be trimmed very precisely, depending on the
> variation in the seating of the component.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
> Sent: Monday, March 26, 2012 9:13 AM
> To: [log in to unmask]
> Subject: Re: [TN] ASSY: Short leads in a PWA
>
> 16 YEARS at TechNet?
> I still feel like "the new guy"!!!
>
> onward thru the fog,
> Jack
>
>
> On Wed, 27 Mar 1996 07:16:59 -0800, Jack Olson <[log in to unmask]> wrote:
>
> >[log in to unmask] wrote:
> >>      Due to a "non-existent" clearance between a PWA and a shielded
> case,
> >>      we would like to have certain components with lead lengths that are
> >>      not long enough to protrude through to the secondary side of the
> >>      board.  Thus, there would be no fillet for a solder joint.
> >
> >We had a similar situation, but in our case we specified that the leads be
> >clipped (after soldering), and the fillet ground down to .030 mils. These
> >boards were for airplanes and had to undergo shock, vibration,
> environmental
> >testing etc. NO PROBLEMS. Of course, you said your clearance was
> >"non-existent", can you spare 30 mils? And by "shielded case" do you mean
> >conductive? You might have to apply some adhesive KAPTON over the pads
> after
> >you grind them, but at least by grinding you have the most lead length,
> and
> >strongest solderjoint possible, still much stronger than a SMT connection,
> >right?
> >                                                  Jack
> >p.s. I would like to hear what others recommend, though... anybody else?
> >
> >
>


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