Hi All!

I'm trying to deal with all the smoke that's here in Boise today, it's
probably the worst smoke I've ever been in. The jet stream has made a dip
and is carrying all the smoke from the fires in Washington, Oregon, and the
fire north of us in Boise county right into the Treasure Valley and it's
all packing up against the mountains to the west of us (cough, cough..)

Anyways, I have a question about a little custom inductor from Vishay Hirel
that we have here. It appears that we have a certain datecode batch of
these where the insulation on the part of the wire that gets soldered into
the board wasn't stripped and tinned high enough, and now when we try to
install them into the board the insulation prevents wetting at the top of
the board and we have insulation in the solder joint which of course is a
defect:

http://stevezeva.homestead.com/Vishay_Inductor.jpg

The picture is of one that we pulled out of a board, and you can see that
the insulation goes down past the shoulders and into what is supposed to be
the solderable area.

I think I know the answer to my next question, but I'll ask it anyway. Is
there any clever way to remove that insulation without damaging the
inductor? The picture makes this inductor look huge, but it's not, it's
maybe .250" in diameter, and the wire is a pretty small gage too.

I tried dipping it first in a lead-free tinning pot set at 600 C., no luck,
then 700 C., no luck, then 800 C., and no luck. I was able to darken the
insulation and melt the yellow tape that wraps the inductor, but that's
about it. I'm think that the only way to remove this insulation is
mechanically...which will be a trick because the inductor and wire is
pretty small.

Hate to scrap these things because they are long lead custom inductors. But
we can't use them like they are....

Steve

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