[TCML] Winding the primary
bunnikillr at cox.net
Fri Jul 11 14:33:14 MDT 2008
Heating the tube with a propane torch untill it changes to a darker
color seems to work... but it leaves a rather unsightly tone to the
copper and if you desire that nice sheen/shine, a fair amount of work
will be needed to bring back the luster...
Neal Namowicz 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.
> ----- Original Message ----- From: "Quarkster" <quarkster at att.net>
> To: "Tesla Coil Mailing List" <tesla at pupman.com>
> 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.
>> Herr Zappp
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