Steve,
I got to thinking, what about using a CO2 laser...
http://www.spectrumtech.com/product-groups/wire-stripping-systems
Maybe just a bit too large?
Bob
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Yuan-chia Joyce Koo
Sent: Thursday, July 17, 2014 5:51 PM
To: [log in to unmask]
Subject: Re: [TN] Removing insulation from inductor wire..
Steve, try this mask with carbon insert. it works wonder to filter the smoke, smell. it is better than the hog nose type... ;-).
http://www.amazon.com/Can-Breathe-Masks-Honeycomb-Carbon/dp/
B0016IM7KQ/ref=pd_sxp_f_pt
jk
On Jul 17, 2014, at 1:46 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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