Hey Ed!
These might work pretty good! Thanks! It's going kinda' tedious, but
probably better than scrapping the parts...
Steve
On Thu, Jul 17, 2014 at 12:06 PM, Ed Popielarski <[log in to unmask]
> wrote:
> I've had great success with using this tool to remove the enamel coating.
> Price here is reasonable. Yeah, HiRel.
>
> http://www.micromark.com/tweezer-sprue-cutter-despruing-tweezer,8012.html
>
> Ed Popielarski
> Engineering Manager
>
>
> 970 NE 21st Ct.
> Oak Harbor, Wa. 98277
>
> Ph: 360-675-1322
> Fx: 206-624-0695
> Cl: 949-581-6601
>
> “It's one kind of victory to slay a beast, move a mountain, and
> cross a chasm, but it's another kind altogether to realize that the beast,
> the mountain, and the chasm were of your own design.”
>
> https://maps.google.com/maps/myplaces?hl=en&ll=48.315753,-122.643578&spn=0.011188,0.033023&ctz=420&t=m&z=16&iwloc=A
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
> Sent: Thursday, July 17, 2014 10:46 AM
> To: [log in to unmask]
> Subject: [TN] Removing insulation from inductor wire..
>
> 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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