RE: [TCML] Secondary to toriod ?

["Lau, Gary" <Gary.Lau@xxxxxx>]

Hi Stan,

There is absolutely nothing wrong with what you suggest.  What is important is that there should be no path between the carriage bolt heads, to any conductor at the opposite end of the secondary.  Any VERY well sealed insulator to block that path would accomplish that goal.

I use a similar technique, except that I embed a nut rather than a bolt in each end of the secondary.  This makes storage of the secondaries more convenient, and allows me to choose threaded rods of differing lengths, so that I can use various length spacers between the secondary base and the support plate.  See photos at http://www.laushaus.com/tesla/secondary.htm.

Some folks have suggested avoiding metal wherever possible in and around secondary and primary coils, but that's simply not necessary.  One just needs to apply common sense, and avoid the possibility of a direct path where a secondary breakdown could occur.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of stanley miller
> Sent: Sunday, August 24, 2008 12:39 PM
> To: tesla@xxxxxxxxxx
> Subject: [TCML] Secondary to toriod ?
>
> Hi all,
>
> I am wondering if anyone could explain why a zinc carriage bolt inserted into the
> center of a plastic cover, glued on top of the secondary, with the bolt head inside
> covered by a plastic cap would not work or be potentially dangerous.  This would
> allow the toriod to be completly adjustable, limited only by the size of the bolt.  I
> have never seen a TC with this sort of setup, it is always with standoffs or pvc
> piping rigged up in some way or something else.
> Please correct me where my theory is wrong.
>
> -If the secondary cover sits 1.5" to 2" inches above the last winding on the
> secondary the only thing that could still affect the bolt would be magnetic field
> which i do not see how it would hurt the bolt or shunt it in anyway.
>
> -Since the toriod would be at the same potential as bolt there would be no fear of
> arcing to it.
>
> -The bottom inside of secondary would have nothing metal to arc thru from top to
> bottom.
>
> -since toriod capacitance is dependent on size wouldn't the bolt add a small amount
> to the overall capacitance of toriod
>
> -I am embarassed to say i have an electrical degree and work in electronic field and
> am asking such a silly question.  ( but i do not pretend to know anything about tesla
> coils or high voltage for that matter!)
>
> Thank ya all!
> Stan
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