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Re: [TCML] Coil V1.8
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
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
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.
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 ;-)
> 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
> > 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
> > not look very attractive on the cardboard tube. Your wire is wound over
> > AC-43.
> > Remove the inner spiral which contains the water release agent. Sand
> > thoroughly inside and out. Be sure you get all the lettering and
> > 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
> > as a max value. No racing sparks -- ever.
> > Dr. Resonance
> > On Thu, Aug 5, 2010 at 10:06 PM, Joe Mastroianni <joe@xxxxxxxxxxxxxx>
> >> 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
> >> in asrgs.
> >> Also I got some 8" sonotube. Problem with sonotube is it seems flimsy
> >> too easily dentable. Anybody got suggestions for strengthening sonotube
> >> 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
> >> raising the sec). Of course, it's a new sec now, so things have changed
> >> 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
> >> from JavaTC. I cut the innermost turn out of my primary, which gave me
> >> 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
> >> 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
> >> redrill the primary platform and run the lead to the innermost turn 1/2"
> >> further out.
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