Bill,
Since we hand solder almost exclusively, I can't speak to the filling of
the swaged area of terminals. However, since half our assembly work is
done to NASA standards, I can speak about "elliptical" swages. We have
been doing these for many years. As you discovered, the terminal
manufacturers know nothing about these types of swages nor the tooling to
perform them. We simply took the standard funnel (or circular) swaging
tool (as opposed to the roll swaging tool) and ground off part of the
circle, leaving a long, thin swage. The bottom of the terminal "flows"
around the edges of the tool and leaves what is close to an ellipse. In
ASCII, the tool looks something like:
/\
/ \
| |
| |
| |
\ /
\/
[Sorry, that's the best I can draw it]
The ground-off areas at the sides allow for solder to flow into the
plated-through hole while the intact areas at the top and bottom ensure
contact with the land. Hope that helps.
Howard Feldmesser
Johns Hopkins University Applied Physics Laboratory
At 08:01 AM 1/22/98 PST, you wrote:
>to Jan Satterfield and Sherry Warner:
>
>My experience with the soldering of terminals also seems to lead to a bit of
>confusion for the solder criteria. When we wave solder terminals, we do not
>have a problem with topside solder joints. The top side fillet is small, but
>upon close examination, excellent wetting is present.
>
>The problem that I'm having, based upon someones interpretation, is that
>solder is not allowed to fill the swaged area on the solder source side of
>the board. So therefore, we tend to mask terminals and hand solder after
>wavesoldering. The hand soldering is done from the solder source side
>without problem. Do either of you have any reference criteria for the filing
>of the swaged area ?
>
>Sherry, you speak to the NASA specs with respect to elliptical swaging. I
>have spoken with a couple of terminal and swaging manufacturers (Cambion and
>Concord) and they indicate that they don't know anything about elliptical
>swaging. Have you ever bought elliptical tooling ?
>If so, I am interested in your sources.
>
>Thanks,
>
>Bill Kasprzak
>Moog Inc.
>East Auruora, NY
>[log in to unmask]
>716-652-2000 ext 2507
>
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