> I bet you need this size sec approx 1/2 inch above
> the horizontal
> plane of the pri
What do you mean by horizontal plane of the primary,
the plane of the base or at the top?
Thanks,
Curt.
--- Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
>
>
> You might consider a "test rig" setup using a small
> DC motor running
> a thick piece of tygon tubing to lower and elevate
> your sec coil
> while it is running. A speed of 6-10 rpm will work
> nice.
> DC motor is reversable.
>
> I bet you need this size sec approx 1/2 inch above
> the horizontal
> plane of the pri for the best performance without
> flashover. The pri
> is also too long. It needs to be 2-3 inches total
> base to
> top. Since it's only a 60 ma NST you could use 12
> awg scrap house
> wire for a test and then switch to #6 or 8 awg solid
> copper ground
> wire (Home Depot) for the final coil.
>
> Distance from pri to sec should be approx 2-3 inches
> when the primary
> is shortened.
>
> With this type of solenoid coil you also need to
> avoid extra unused
> turns at the top as the "auto-transformer" effect
> will produce over
> 40-50 kV on the top turn of your primary.
>
> Dr. Resonance
>
>
> >The secondary is 2.25", and the primary is 10"...
> >
> >Pictures at www.nationalvintageracing.com/temp
> >
> >Curt.
> >
> >
> >--- Tesla list <tesla@xxxxxxxxxx> wrote:
> >
> > > Original poster: "D.C. Cox"
> <resonance@xxxxxxxxxx>
> > >
> > >
> > > What is the dia. of your sec. coil??
> > >
> > > Dr. Resonance
> > >
> > > >I completed my first coil this last weekend and
> did
> > > a
> > > >few unusual things in the construction. The
> > > helical
> > > >primary is much larger diameter than required
> for
> > > such
> > > >a small primary. I used a secondary coil that
> I
> > > wound
> > > >in High School 25+ years ago, and intend to
> replace
> > > it
> > > >later with a large coil. To help comphensate
> for
> > > the
> > > >loose coupling I moved the primary up a couple
> of
> > > >inches. As I understand it, the maximum
> coupling
> > > >would be with the primary centered half way up
> the
> > > >seconday, but this location would result in
> > > >overcoupling the coil. I chose a height that I
> > > >beleive was a good compromise.
> > > >A friend with a lot of tesla experience what I
> had
> > > >done and objected. He insisted that I needed to
> > > "drive
> > > >the coil from the bottom". While tuning the
> coil
> > > we
> > > >ended up removing several inches of turns from
> the
> > > >bottom of the secondary coil due to his
> insistence.
> > > >Now that the coil is working, I'm considering
> > > moving
> > > >the secondary down to it's original elevation.
> Who
> > > is
> > > >right here? Is there a reason (other than over
> > > >coupling and increased possibility of arc over)
> > > that
> > > >this should not be done?
> > > >Thanks,
> > > >Curt.
> > > >
> > >
> > >
> >
> >
>
>
>
>