Hi Graham,

Thought about that but we didn't discover the problem until they were already in the board. Raising them up wouldn't give them any lead protrusion. Plus they get RTV'ed down after assembly, so they don't want them up off the board.

I think these parts are hosed...

Steve

Sent from my BlackBerry 10 smartphone.
  Original Message  
From: Graham Collins
Sent: Thursday, July 17, 2014 11:56 AM
To: TechNet E-Mail Forum; Steve Gregory
Subject: Re: [TN] Removing insulation from inductor wire..

Hi Steve
No advice on removing the insulation, but can you space the part up off 
the board a bit to get the insulation out of the solder joint? Would 
avoid scrapping the parts...

Good luck with the smoke, we've had that a couple of times here and it 
is no fun.

regards,

Graham Collins
Senior Process Engineer
Sunsel Systems
(902) 444-7867 ext 211

On 7/17/2014 2:46 PM, 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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