Steve,

Have you tried thermal strippers with the bridge notched for the size 
wire?    That is where I would go, that is the only thing that will work 
on the kevlar coated triaxial cable we used in the power plant.

pat





On Thu, Jul 17, 2014 at 10:46 AM, Steve Gregory wrote:

> 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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