RE: [TCML] Winding the primary

["Dave Halliday" <dh@xxxxxxxxxxxxxx>]

This was for another project but I live in a rural area so I built a small
bonfire and buried the copper at the bottom.  The next day, when everything
had cooled down, it was nice and ductile.

A charcoal grill would work too.

Dave 

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx 
> [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Henry Hallam
> Sent: Friday, July 11, 2008 1:10 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Winding the primary
> 
> I've tried it not in the oven, but on a gas burner ring and separately
> with a blowtorch.  Both worked pretty well, though it's still a pain.
> 
> Henry
> 
> On Fri, Jul 11, 2008 at 2:37 PM, Neal Namowicz 
> <neal@xxxxxxxxxxxxxxxx> wrote:
> > I have a couple of lengths of  "salvaged" tubing myself 
> with a few too many
> > bends in it. I wouldn't have bothered in the past, but with 
> the cost of
> > copper... Anyway, I was wondering if anyone has managed to 
> UN-work harden
> > tubing? I was thinking of sticking it in the oven on high 
> heat for a while
> > and letting it slowly cool. Anyone ever try it? It's a pain 
> in the neck,
> > sure, but compared to unpotting an nst for example, it 
> doesn't sound too
> > bad.
> >
> > Neal.
> >
> >
> > ----- Original Message ----- From: "Quarkster" <quarkster@xxxxxxx>
> > To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> > Sent: Tuesday, July 08, 2008 11:18 PM
> > Subject: Re: [TCML] Winding the primary
> >
> >
> >> Steve -
> >>
> >>  What is your primary conductor? If you're using copper 
> tubing, here are a
> >> few tips:
> >>
> >>  1. Use virgin refrigeration tubing, and leave it in the 
> coiled shape that
> >> it comes in. Don't try to re-use "salvaged" tubing if you 
> want a nice
> >> looking primary. Copper tubing "work-hardens" and stiffens 
> very rapidly as
> >> you deform it, so deform it as little as possible.
> >>
> >>  2. DO NOT try to straighten the tubing, then re-form it 
> into a spiral.
> >> The tubing will work-harden, then is likely to kink and 
> become unmanagable.
> >>
> >>  3. Have an assistant hold the coil of tubing about a foot 
> above your
> >> primary forms, and just let one coil drop down at a time. 
> The typical
> >> diameter of a coil of rerfigeration tubing is around 18", 
> so I start at the
> >> end of the primary that is closest in diameter to the 
> diameter of the coil
> >> of tubing. For a small diameter primary this means 
> starting at the OUTSIDE
> >> of the primary form and wind inward. For a large diameter 
> primary, this
> >> means starting at the INSIDE of the primary form and 
> winding outward. This
> >> way the tubing requires minimum deformation initially, and 
> then must be
> >> gradually formed into a larger or smaller radius as you 
> move outward or
> >> inward.
> >>
> >>  Regards,
> >>  Herr Zappp
> >>
> >
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