Caustic pot?

http://www.eraser.com/products/wire-cable-strippers-product/chemical-wire-stripping/dsp2-stripping-pot/


On 17 July 2014 13:56, Graham Collins <[log in to unmask]> wrote:

> 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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