Message-ID: <001101bfcc87$1060e4e0$0d5a883e@iway.co.uk>
From: "Robin Greenwood" <robin@g3lba.freeserve.co.uk>
To: rsgb_lf_group@blacksheep.org
References: <134.200006021150@gemini>
Subject: LF: Re: Litz wire stripping method
Date: Fri, 2 Jun 2000 12:38:23 +0100
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Splay wires slightly, heat in a methelated spirit flame. until red hot then
plunge into a small pot of Meths  It comes out clean. Do this cautiously and
outside...!!!..
Robin G3LBA
----- Original Message -----
From: "James Moritz" <j.r.moritz@herts.ac.uk>
To: <rsgb_lf_group@blacksheep.org>
Sent: 02 June 2000 13:57
Subject: LF: Litz wire stripping method


> Dear LF Group,
> I recently salvaged some thick litz wire, and have been trying to
> find a workable method of stripping the insulation. The enamel is of
> the older, dark coloured type, which cannot be removed by dipping
> in molten solder. The overall conductor thickness is about 4mm
> with 729 strands, and a spirit burner as previously suggested on
> this reflector just does not make any impression. A blowtorch does,
> but also burns away the outer strands and the plastic sheathing. I
> believe chemical strippers are available, but have to be melted at
> high temperature, and then neutralised afterwards.
>
> However, the following seems to work quite well - strip about 50mm
> of the plastic sheathing, and wrap the end 25mm of wire strands
> tightly in a piece of copper foil (such as can be peeled off some
> PCB laminate, or the type used for EMC shielding). Wrap a smaller
> piece of foil around the 12mm of wire strands nearest the stripped
> back sheathing, and grip with a pair of pliers - this acts as a
> heatsink to protect the sheathing. Heat the foil covered end red hot
> with a blowtorch. The enamel burns off with a small flame at the
> end of the foil, while the foil protects the copper strands from the
> blowtorch flame. When the flame goes out, leave to cool and
> unwrap the foil. The wire strands are coated in black, shiny
> residue, which can be cleaned off by rubbing the end of the wire
> against the bottom of a shallow dish full of water, as if cleaning a
> paint brush. Somewhat suprisingly, this leaves clean, shiny strands
> of copper that can be soldered in the usual way.
>
> Just thought this might be useful to know,
> Cheers, Jim Moritz
> 73 de M0BMU
>
>
>
>