Re: Slide-choke construction

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

Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com> 


A small 5 inch dia. hand crank available from McMaster-Carr works good.  Use
a standard 1/2-13 threaded rod with a threaded nut

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, May 14, 2004 2:32 PM
Subject: Re: Slide-choke construction


 > Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com>
 >
 > Heres a common problem, whats a easy way to move the core in and out?
 >
 > ---Eric
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Wednesday, May 12, 2004 9:55 PM
 > Subject: Re: Slide-choke construction
 >
 >
 >  > Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
 >  >
 >  >
 >  >
 >  >
 >  > Another interesting advantage using a large sliding choke offers is
that
 > it
 >  > can eliminate the costly variac altogether!
 >  >
 >  > With the core in full, only a few Amps (magnetizing currents) are drawn
by
 >  > the HV xmfr so while it remains at the full 240 VAC it doesn't get any
 >  > appreciable current so nothing happens.  The xmfr can't supply enough
 >  > current to charge the caps.
 >  >
 >  > As the core is slowly withdrawn the current begins climbing.  You can
set
 >  > the current point at any current level you desire and do not need a
variac
 >  > at all.
 >  >
 >  > It's an interesting concept and works very well.  We use this idea to
 >  > eliminate variacs in all of our larger systems.
 >  >
 >  > Dr. Resonance
 >  >
 >  >
 >  >
 >  >  >
 >  >  > this has nothing to do with the steel rod idea but it may help by
 > giving
 >  > you
 >  >  > a ballpark figure to work with. My current limiter was made by
winding
 >  > about
 >  >  > 50-60 turns of 2.5 square millimeter house wire (rated at 25amps
 >  > continous)
 >  >  > onto an old MOT core this limits to current in my MOT bank to about
 >  > 35amps.
 >  >  > In terms of linkage http://tesla.reidconsulting-dot-com.au/tesla.html
 > details
 >  >  > exactly what you're building
 >  >  > and http://www.richieburnett.co.uk/ballast.html has a lot of info on
 >  >  > ballasting.
 >  >  > Hope this is of some help
 >  >  > Pat
 >  >  > ----- Original Message -----
 >  >  > From: "Tesla list" <tesla-at-pupman-dot-com>
 >  >  > To: <tesla-at-pupman-dot-com>
 >  >  > Sent: Thursday, May 13, 2004 2:10 AM
 >  >  > Subject: Slide-choke construction
 >  >  >
 >  >  >
 >  >  >  > Original poster: "Erik Byng" <ebyng-at-knox.edu>
 >  >  >  >
 >  >  >  > Hey list:
 >  >  >  > A while back, in a post titled "the amazing variable choke,"
someone
 >  >  >  > mentioned that they'd build themselves a slide choke, running a
 > bundle
 >  > of
 >  >  >  > epoxied steel rods through a pvc form with the coil wound on it.
 > I'm
 >  > now
 >  >  >  > thinking of building one myself, but the dimensions I'm a little
 > shakey
 >  >  > on.
 >  >  >  > I have a +/-300ft roll of 10ga thhn which seems up to the
challange,
 >  > but
 >  >  >  > should it be wound with very few layers on a long form, or many
 > layers
 >  > on
 >  >  > a
 >  >  >  > short form?  I would think that to get the most out of the rod's
 >  > travel,
 >  >  > it
 >  >  >  > would have to be wound long..  5 or so coil layers over ten
inches
 > of
 >  >  > travel
 >  >  >  > sound decent?
 >  >  >  >
 >  >  >  > Erik
 >  >  >  >
 >  >  >  >