Re: [TCML] Secondary to toriod ?

["Mark Olson" <kc5gym@xxxxxxx>]

Stan,

If I understand your proposed method of mounting the toroid, you submit that
the bolt be inserted down into the secondary coilform.
This is probably not such a good idea, but I see your reasoning that the
bolt would be at about the same potential as the secondary
at that height.  If the bolt extended farther into the secondary, there
would be a potential difference between the bolt and the level
of the secondary winding that the bolt is adjacent to.

I actually use this method of adjusting the coupling on my coil, just at the
bottom end where there is no winding on the coilform.
The bolt being allthread rod with a nut and washer to adjust the
height.Inside the coilform, I glued a pvc pipe and cap for the rod to
extend into.

To adjust the toroid using a variation of your proposed method, I would
mount the allthread rod into the coilform top, possibly
insulating it with a cap, as you proposed, but I would leave the excess rod
sticking above the toroid thereby allowing a pair of
nuts and washers sandwiching the disc of the toroid, to allow for height
adjustment.

Just my  $0.02 worth.

Marko
KC5GYM

----- Original Message -----
From: "stanley miller" <swm334@xxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Sunday, August 24, 2008 11:39 AM
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




_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla