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Re: [TCML] Primary tubing

The wire radius also affects the potential to arc from inner turn to primary. There is more than simply the AC resistance involved. I've heated up inner turns on 3/8" tubing. Remember there are hundreds of amps pulsing. It all averages out in the end and there are variables involved (bps, voltage, average power, coupling, etc..). This is all echoed by our experiences only. In other words, on a set secondary and primary configuration, the primary can be over-built or under-built depending on the variables mentioned. I think to "know" ahead of time is at this point best done through empirical data (which has not been gathered in any meaningful way expect our own personal experiences). Current carrying surface area is only the tip of the iceberg and is not necessarily the defining factor. 

Take care,
Bart

Jim Mora wrote:

Hi Rob,

3/8" is great for such a coil but fractions suck. Switching to decimal. Lets
see C= pi*D = which will be the circumference thus 3.14* * .375)= 1.1775" of
surface area viewing it like one sided ribbon. Pretty fair; the jury is
still out on how much of the inner skin is used I believe. 
I am using .375" at 5KVA (12 turns). My 24" coil has 100' .5" sitting here
this I bought scrap for $25.00 before blast off to untouchable. Now we have
3.14*5= 1.57" not really that much difference. JAVATC will give you the
reactance and the DC resistance I believe.

Jim Mora


-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of stamsund
Sent: Thursday, August 28, 2008 8:44 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Primary tubing

Bert and Garry,
Thanks for the quick response. I let out a sigh of relief on this one as I bought a roll of 100 feet. My next coil will be a 12 inch with (2) 15KV 60ma NSTs, so I might still be ok with the 3/8 inch tubing. If not I have a
source for 70 feet of dirty 3/8 water tubing (1/2 inch od) which I could clean up and anneal if need be. 

Rob
----- Original Message ----- From: "Bert Hickman" <bert.hickman@xxxxxxxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Thursday, August 28, 2008 7:05 AM
Subject: Re: [TCML] Primary tubing



Hi Rob,
No problem. Refrigeration tubing is the kind you want, and it's fine for your coil. You can use it with no problems with your proposed power source 


and at significantly higher power levels in the future. Just make sure you
use at least a 1/4" air gap between adjacent turns. I used similar tubing on a 10" coil with two 15/60's with no problem whatsoever. 

Bert
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stamsund wrote:

Fellow coilers,

Some time ago ordered some 1/2 inch copper tubing on e-bay which I
incorrectly assumed was 1/2inch plumbing tubing.  It was actually
refrigeration tubing.   I just gauged it and found it is actually
only 3/8 inch O.D. not 1/2 Inch as advertised.  I'm building an 8
inch coil with (2) 12KV 60ma NSTs for a total of 120 MA.  Would the
3/8 OD tubing be adequate for the primary or should I go larger?

Rob R. _______________________________________________ Tesla mailing
list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla


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