RE: primary and secondary diameters and more

From: 	Christopher Stone[SMTP:stone-at-etak-dot-com]
Sent: 	Monday, December 01, 1997 4:07 AM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: primary and secondary diameters and more

Thanks for the information!  Here is my current plan:
I would like to build something with a secondary in the range of 3.5 to 4" 
diameter, with a neon transformer up to 60ma 12Kv, commercial caps.  I 
would like to have 12-36" sparks.  As of now I have only a few parts 
and have started to build the spark gap (easiest parts to find).  I 
would like to keep the cost down and am currently looking for the 
transformer and caps.  Should I get these then go from there after 
I have the voltage and amperage ratings of the transformer?  

I plan to put the whole primary inside an enclosure made of aluminum and 
plexiglass.  The secondary will be wound on polyethelyne or PVC tubing, I 
understand PVC is not as good? The coils will be mounted on top of a 
plexiglass top to the aluminum box.
The two sources of information I have at this time (other than the net) 
are the Tesla Coil book by George Trinkaus and a book that has the plans for the Information Unlimited coil of similar dimensions.  The coil in the book 
(BTC3) has the "bundled primary" I guess this is scramble wound?

Does this sound like it will work so far?  What are the specs of anyone 
elses successful project of similar size?


> From: 	D.C. Cox[SMTP:DR.RESONANCE-at-next-wave-dot-net]
> Sent: 	Wednesday, November 26, 1997 11:55 PM
> To: 	Tesla List
> Subject: 	Re: primary and secondary diameters
> To: Chris
> If you are building your first coil you might wish to reconsider some
> parameters.  8 guage wire is quite large and is usually reserved for coils
> operating at 8 kw or higher powers, ie, a pole transformer unit which is
> quite dangerous to the first time builder.  If you are running a neon
> transformer setup what kind of spark are you aiming for?  A nice 6" x 30"
> sec coil closewound with #24 AWG polythermalize (200 degree C) magnet wire
> will deliver a consistent 40-48 inch spark if equipped with a 20 x 5
> toroid.  
> A good "rule of thumb" is to place the lowest sec winding approx 1 1/4 to 1
> 1/2 inch above the top turn of the flat spiral primary coil.  The inner
> primary turn should be approx 1 1/2 inch to 1 3/4 inch from the sec
> coilform.  This will allow a correct coefficient of coupling on most coil
> setups and good performance.  A good practice is to use some scrap 12 AWG
> house wiring for the "test" primary and affix this to some scrap plywood as
> well.  After you have your cap value and tried a number of different turns
> you can replace the primary with some neater copper tubing or flat copper
> strap (best if a large number of turns is required).  The plywood can be
> laminated with Formica which makes a neat looking support.
> Don't forget to elevate the primary/sec coil at least 12 inches above the
> lower support so as to "decouple" the primary coil from the concrete floor
> or table-top.  
> Hope this information is of assistance.
> DR.RESONANCE-at-next-wave-dot-net
> ----------
> > From: Tesla List <tesla-at-pupman-dot-com>
> > To: 'Tesla List' <tesla-at-poodle.pupman-dot-com>
> > Subject: primary and secondary diameters
> > Date: Tuesday, November 25, 1997 8:25 PM
> > 
> > 
> > From: 	Christopher Stone[SMTP:stone-at-etak-dot-com]
> > Sent: 	Tuesday, November 25, 1997 6:45 AM
> > To: 	tesla-at-pupman-dot-com
> > Subject: 	primary and secondary diameters
> > 
> > Hi all,
> > 
> > I am working on building my first coil and I have found information 
> > that has stated that the primary should be twice the diameter of the 
> > secondary and others state 3 times the diameter.  Which works best? 
> > I was planning on using heavy guage wire #8 or so, how much difference 
> > does it make between air wound and bundled?  
> > 
> > Thanks,
> > 
> > Chris
> > 
> >