Re: [TCML] Coil V1.8

[DC Cox <resonance@xxxxxxxxxxxx>]

No, I don't thin it --- use it straight from the can.  Xylol will thin it if
you need to.

yes, inner spiral of "release agent" on inside of tube that releases tube as
concrete cures.

With a synchro sparkgap, then use something ,like 2.6 x res. value.  I run a
small 9" dia disk at 2400 rpm, 6 electrodes, non-synchro, for 240
pulses/sec.  Use 1 x 1 x 2.5" tall brass stock with 1/2" tungsten electrodes
for the fixed electrodes.  I don't use a safety gap --- really don't need
it.

Hope you can make our Tesla Fest on Sept. 4th.  You can see a variety of
small and med size coils up close and running.

Dr. Resonance


On Thu, Aug 5, 2010 at 10:54 PM, Joe Mastroianni <joe@xxxxxxxxxxxxxx> wrote:

> Thanks Dr. R.
> I will try that.  Also - I imagine one must thin the AC-43 before use.
>  What's the ratio you recommend??
> When you say the "inner spiral" you mean on the inside of the tube?
>
> Amen to using JavaTC.  The next problem, which is indeed an problem for
> some people - is putting in ACCURATE numbers to JavaTC and correctly
> interpreting the response.  With Bart's tutelage, I am now in no danger of
> making prior mistakes.
>
> Far as I can tell, JavaTC is dead-nuts-on.    What JavaTC can't tell me,
> though, is how to interpret my safety gaps firing - is it because the timing
> is off slightly on my srsg, or is it tuning, or is it because I have a wire
> loose somewhere?  That, unfortunately, has taken the acquisition of
> empirical data and experience, and the destruction of lots of equipment.
>
> Painful but true...   Alas,  the wise man once said that if we didn't make
> mistakes, we would never learn anything as engineers.  And given that, I
> must be pretty durned brilliant by this point ;-)
>
> Joe
>
> On Aug 5, 2010, at 8:36 PM, DC Cox wrote:
>
> > yes, 2-3 coats of Dolph's AC-43 which soaks into the tube and strengthens
> it
> > considerable. It stiffens it up.
> >
> > I usually do 3 inches on each end with G.E. Glyptal (local elec. motor
> > rewind shop), 2 coats, to give the ends a nice red color as the AC-43
> does
> > not look very attractive on the cardboard tube.  Your wire is wound over
> the
> > AC-43.
> >
> > Remove the inner spiral which contains the water release agent.  Sand
> tuber
> > thoroughly inside and out.  Be sure you get all the lettering and
> printing
> > off the outside of the tube.
> >
> > BTW, if everyone would use JAVATC to due the design calculations, racing
> > sparks due to overcoupling would become ancient history.  I used 0.1 to
> 0.14
> > as a max value.  No racing sparks -- ever.
> >
> >
> > Dr. Resonance
> >
> >
> >
> >
> > On Thu, Aug 5, 2010 at 10:06 PM, Joe Mastroianni <joe@xxxxxxxxxxxxxx>
> wrote:
> >
> >> Hi Bart
> >>
> >> Indeed I had to raise the secondary. Even my new one. No flashover or
> >> racing sparks!  Thanks for the accurate calculations.
> >>
> >> On to the next challenge. I just got some universal motors I'm going to
> try
> >> in asrgs.
> >>
> >> Also I got some 8" sonotube.  Problem with sonotube is it seems flimsy
> and
> >> too easily dentable. Anybody got suggestions for strengthening sonotube
>  for
> >> use as a secondary winding core??
> >>
> >> Cheers
> >>
> >> Joe
> >>
> >>
> >> Sent from Joe's mobile phone.
> >>
> >> On Aug 5, 2010, at 6:05 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:
> >>
> >>> Hi Joe,
> >>>
> >>> Just to clarify the cause. The pri to sec flashover was due to a very
> >> tight distance between the two coils (0.417"), not the coupling. Thus,
> >> increasing to the distance to about 1.5" should stop the flashovers. The
> >> coupling was also high and removing that inner turn also happened to
> drop it
> >> in a range of about 0.125 as opposed to the original 0.14. Coupling may
> >> still need to be lowered slightly to stop the racing sparks (which
> entails
> >> raising the sec). Of course, it's a new sec now, so things have changed
> to
> >> some degree.
> >>>
> >>> Take care,
> >>> Bart
> >>>
> >>> Joe Mastroianni wrote:
> >>> <snip>
> >>>> Bart pointed out to me that on my last attempt all the arcing between
> >> the primary and racing arcs were caused by overcoupling, as we
> determined
> >> from JavaTC.  I cut the innermost turn out of my primary, which gave me
> an
> >> additional 1/2 inch.  The innermost turn of the primary is now , roughly
> >> 1/5" from the lower windings of the secondary.  However, my lead wire
> for
> >> the primary is still going through the same hole, so it's closer.   I
> saw a
> >> spark from there to the secondary when I reached 120V so I stopped.  I
> will
> >> redrill the primary platform and run the lead to the innermost turn 1/2"
> >> further out.
> >>> _______________________________________________
> >>> Tesla mailing list
> >>> Tesla@xxxxxxxxxx
> >>> http://www.pupman.com/mailman/listinfo/tesla
> >> _______________________________________________
> >> Tesla mailing list
> >> Tesla@xxxxxxxxxx
> >> http://www.pupman.com/mailman/listinfo/tesla
> >>
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla