RE: Adjusting coeff. of coupling --- with the coil running!!

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Ralph Zekelman by way of Terry Fritz <teslalist-at-qwest-dot-net>" <gridleak-at-bluemarble-dot-net>

Dr. R,

I will be looking forward to your forthcoming text. I have long wished
that
others on the list would also publish on the Tesla subject.

Would you please explain in greater detail the drive mechanism on your
motor driven variable coupling. I imagine the 3/8 threaded rod threaded
into
an end cap or a plastic insert at the base of the secondary and driven
along
a threaded brass plate fastened to a bottom plate. But if I read
correctly,
you wrote that the hole for the insulated motor-driven rod is drilled
perpendicularly thru the rod. That is where I get lost. Perhaps you
meant
to write that the driving rod is placed in a hole drilled at the bottom
face of
the 3/8 rod and either pinned or held with a jam screw. That would solve

the mystery. The driving rod could also be threaded and screwed into a
threaded hole at the base of the rod. Unless I am missing something,
that
latter method is the one I would like to try.

Thanks for the excellent idea.

Ralph Zekelman









-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, August 10, 2003 12:24 PM
To: tesla-at-pupman-dot-com
Subject: Re: Adjusting coeff. of coupling --- with the coil running!!

Original poster: "Dr. Resonance by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>


It does vary from design to design and that's why I'm suggesting this
motor
experiment.  It doesn't have to be large at all ---- some of those small
surplus gear motors ($5-$10) have plenty of torque to twist a sec. coil
for
short durations.

It's an easy experiment and well worth your time to do it.  It removes a
lot
of extra stress (10-15%) on your cap by establishing the very best
parameters for your coil.

I'm discovering some interesting data relating to coeff. coupling vs.
coilform dia. and I hope to use this in my forthcoming book:  Tesla's
Marvelous Transformer:  The Tesla Coil which I hope to finish writing
and
publish next spring.

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
  >
  > What is the final relative positions between the primary (I'm
presuming
flat
  > spiral) and the bottom turn of secondary.   Does this change from
design
to
  > design or do you see a trend.   Also, what is best coupling (what
ever
gives
  > the best spark or the largest K value)?
  >