RE: [TCML] Flat Spiral Primary

[Mike Thompson <mthompson14@xxxxxxxxx>]

Ok great, thanks for the help. Think I'll flip through your site as well.
 
Thanks
Again
Mike T.


Homepage
http://home.comcast.net/~mikethompson236/index.htm

--- On Thu, 7/23/09, Lau, Gary <Gary.Lau@xxxxxx> wrote:


From: Lau, Gary <Gary.Lau@xxxxxx>
Subject: RE: [TCML] Flat Spiral Primary
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Date: Thursday, July 23, 2009, 11:35 AM


Assuming that you're reasonably competent in soldering, a splice in the tubing is not at all a factor in anything.  If you're careful, you'll never see it.

Copper tubing is the hands-down winner for several reasons.  As far as resistance, it puts the copper where it's useful (i.e. skin effect).  It's easier to splice.  It's far easier to form into an attractive, smoothly wound spiral than heavy-gauge solid wire.  Just be careful to minimize how much you flex it or it will work-harden.  Unwind the coil from the store directly onto the primary form.  The larger diameter of tubing facilitates the use of fuse holder clips to make a tap connection http://mysite.verizon.net/laushaus/tesla/primary_files/image005.jpg.   Other primary photos: http://www.laushaus.com/tesla/primary.htm

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Mike Thompson
> Sent: Thursday, July 23, 2009 11:15 AM
> To: Tesla Coil Mailing List
> Subject: RE: [TCML] Flat Spiral Primary
> 
> Ok, copper it is then. So in your opinion would low gauge copper wire be preferred
> over spliced copper tubing. Or would the diameter of copper tubing be better for the
> skin effect of the high frequency currents? Also could teh spliced tubing effect the Q
> of teh primary?
> 
> Thanks
> Mike T.
> 
> 
> Homepage
> http://home.comcast.net/~mikethompson236/index.htm
> 
> --- On Thu, 7/23/09, Lau, Gary <Gary.Lau@xxxxxx> wrote:
> 
> 
> From: Lau, Gary <Gary.Lau@xxxxxx>
> Subject: RE: [TCML] Flat Spiral Primary
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Thursday, July 23, 2009, 8:21 AM
> 
> 
> Iron/steel and galvanized iron/steel has extremely poor conductivity as compared
> with copper.  High conductivity is very important in the primary circuit.  Use only
> copper.
> 
> Copper tubing is easily and neatly spliced if you need to extend what you have.
> Just insert a ~1" long piece of clean brass #10 screw or threaded rod halfway into
> the two ends; heat and solder.  The screw will keep the two pieces of tubing aligned
> and ensure a sturdy joint.
> 
> Regards, Gary Lau
> MA, USA
> 
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> > Behalf Of Mike Thompson
> > Sent: Wednesday, July 22, 2009 6:51 PM
> > To: Tesla Coil Mailing List
> > Subject: [TCML] Flat Spiral Primary
> >
> > Hello All,
> >
> >   I have been playing around with some calculations for a flat spiral primary coil,
> > and it turns out that the little bit of .25 inch copper tubing I have is not long
> enough
> > to for my needs. I was wondering what some of the draw backs of using 9 gauge
> > galvenized fencing wire would be. It is cheaper and I get twice as much wire for
> half
> > the price of copper.
> >
> > Any thoughts?
> > Thanks
> > Mike T.
> 
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> 
> 
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