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RE: [TCML] Primary tubing
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
> --
> ***************************************************
> We specialize in UNIQUE items! Coins shrunk by huge
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> Lightning") and out of print technical Books. Visit
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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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