Re: Do these numbers look right?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Ed Phillips <evp-at-pacbell-dot-net> 

Tesla list wrote:
 >
 > Original poster: "Richard Modistach" <hambone-at-dodo-dot-com.au>
 >
 > try your nearest industrial refrigeration\air conditioning
 > mechanic\engineering shop, they often have pipe on huge rolls,
 > tell them what it's for,
 > ask them nicely to handle carefuly to avoid sharp kinks.
 >
 > regards
 > richard
 > aus.
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Tuesday, February 17, 2004 10:37 AM
 > Subject: Do these numbers look right?
 >
 >  > Original poster: JOSEPH CACCIATORE <jocatch-at-us.ibm-dot-com>
 >  >
 >  >
 >  > Hello again. I am well on my way to designing my first TC after giving up
 >  > trying to restore my old PE magazine coil from 1964. I checked and there
 >  > are a slew of programs and spreadsheets written to help design a TC.
 >  > Unfortunately some give different results for the same input conditions.
 >  >
 >  > The program I found to be extremely helpful is an Excel spreadsheet 
called
 >  > the Tesla Coil Designer 3.0 by Ed Sonderman and Corey Ruch. It is great
 >  > because you can adjust the secondary/primary parameters and watch for 
when
 >  > they come in sync.
 >  >
 >  > But never trusting any program fully (i.e., Tax Deluxe say I had an extra
 >  > $1800 coming back on my tax return, it was wrong!), I was hoping someone
 >  > could verify and look at these numbers to see if the coil really will
 >  > perform before I spend all this time, effort and money.
 >  >
 >  > If anyone is willing, here are the specs I came up with:
 >  >
 >  > NST = 12,000v, 30ma, 60hz
 >  > Secondary = #22 wire, 20" long, 4" diameter, 765 turns-at-97%
 >  > Primary = flat spiral, I.D. = 6", 15 turns, .25" pipe, .25" spacing,
 >  > width=7.25"
 >  > Capacitor = .007uf
 >  > Toroid = Dmin= 4", Dmaj= 24"
 >  >
 >  > The spreadsheet says secondary res F = 257kh, primary res F = 221khz.
 >  >
 >  > My concern is if I use any larger cap, I can't get the prim/sec 
parameters
 >  > to match good enough. Also, I don't have any material for a toroid here
 >  > that I can look at so I assume 4" almunin flex hose but I don't know if
 > 24"
 >  > is realistic. Lastly, the primary requires 53' of copper tubing. I am not
 >  > sure where to buy such a long length. I have seen only 25' at Home Depot.
 >  >
 >  > Thanks.
 >  >   JC

	Use #10 solid copper wire (available bare at hardware stores).  It will
work just fine and a lot easier to mess with.  Before winding I usually
stretch the wire a bit to straighten it.  For wire this big I fasten it
to the front bumper attachment of my car and to my bench vise and back
up VERY slowly!  A stretch of  5% seems to work fine and work hardens it
enough that it makes a very nice looking winding.  I use this method for
"radio coils".

Ed

Ed