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Re: [TCML] Coil V1.8
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
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.
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??
> 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.
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