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August 2007

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TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Mon, 27 Aug 2007 16:30:29 -0500
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It might also be from too hot of a soldering iron, water soluble flux migrating and causing the gapping/oxidation, or even an incompatible wash additive. I know of a few cleaners who destroy some mag wires so maybe this is similar. 

Kat

----- Original Message -----
From: "Hogg, Blair K." <[log in to unmask]>
Date: Monday, August 27, 2007 4:22 pm
Subject: Re: [TN] 26 AWG HML Wire
To: [log in to unmask]

> I'm not sure about the process that applies the insulation, but if the
> wire is oxidized, perhaps the coating won't adhere? 
> 
> Blair
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
> Sent: Friday, August 24, 2007 2:30 PM
> To: [log in to unmask]
> Subject: Re: [TN] 26 AWG HML Wire
> 
> Hi Donald!
> 
> I got your pictures posted. I'll paste the appropiate picture 
> links to
> each of your descriptions below...
> 
> Steve Gregory
> 
> ________________________________
> 
> From: Donald Kyle [mailto:[log in to unmask]]
> Sent: Friday, August 24, 2007 11:08 AM
> To: [log in to unmask]
> Cc: Steve Gregory
> Subject: 26 AWG HML Wire
> 
> 
> Steve, would you mind posting these pictures for me.
> Thanks in advance
> Donald Kyle
> 
> Good morning
> 
> I have some inductors that were made recently that we are having an
> issue with.
> 
> They are wound multifilar with 26 AWG HML wire.  The problem is 
> with the
> polyimide insulation; it's peeling off the wire.  Not good for the 
> wiresto short.
> 
> I'm suspecting that the insulation was not cured or maybe it's not
> polyimide insulation.
> 
> The insulation is peeling where the wire was bent tight and even where
> it wasn't.  
> 
> These inductors have had a varnish applied and cured but no other
> processes after that except assembly onto boards.
> 
> Picture 1 is a lead that was soldered to the board; you can see the
> insulation has peeled back. 
> 
> http://stevezeva.homestead.com/files/Picture_1.jpg
> 
> In picture 2, the wires are held together with epoxy and the 
> insulationhas peeled back where the wires make a bend. 
> 
> http://stevezeva.homestead.com/files/Picture_2.jpg
> 
> In picture 3, is another wire with the insulation peeling back. 
> 
> http://stevezeva.homestead.com/files/Picture_3.jpg
> 
> In picture 4, you are looking straight down the barrel.  Notice 
> how the
> insulation has come away all around the wire. 
> 
> http://stevezeva.homestead.com/files/Picture_4.jpg
> 
> In picture 5, you are looking at picture 4 but at an angle. 
> 
> http://stevezeva.homestead.com/files/Picture_5.jpg 
> 
> In picture 6, you are looking at a good piece of wire from my 
> stock. 
> 
> http://stevezeva.homestead.com/files/Picture_6.jpg
> 
> 
> Any ideas?  
> 
> 
> 
> 
> 
> Donald Kyle C.I.D.+ 
> 
> 
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