Re: Primary pipe size/spacing questions?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Tyler <blimpie120@xxxxxxxxx>

Yea, Menards here doesn't even carry anything longer
than 20' of 1/4" pipe, and all the plumbing shops want
$30-$50 for a 50' roll of 1/4". There is no Home
depot, Lowes, or any other large hardware stores up
here either. Hell, I havent even found someone else
with a telsla up here in North Dakota.

You said a larger pipe may requre more space between
turns. I was actually still planning on going with a
1/4" spacing between turns, should I increase this to
say, 5/16", or 3/8"?

Thanks again for the input
~Blimpie


--- Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: Steve Ward <steve.ward@xxxxxxxxx>
>
> More power is not required for larger diameters of
> conductor. Larger
> conductors simply offer lower resistance (which is
> good for any
> power).  The larger conductor will need slightly
> more spacing between
> turns, this will affect the over all inductance (as
> you mention) but
> more inductance again doesnt imply anything about
> the power needed to
> drive it.  Does that answer your question?
>
> the 3/8" tubing will work just fine keeping in mind
> it will produce a
> physically larger primary for a given number of
> turns (and similar
> inductances).
>
> Is 3/8" really cheaper than 1/4" where you live?  I
> paid $25 for 60'
> of 3/8" at menards, and $13 for 50' of 1/4" at home
> depot, but home
> depot wanted much more for the 60' of 3/8".  Just
> goes to show its
> good to shop around.
>
> Steve Ward
>
> On 4/26/05, Tesla list <tesla@xxxxxxxxxx> wrote:
>  > Original poster: Tyler <blimpie120@xxxxxxxxx>
>  >
>  > Ok, I am in the process of building/designing
> another
>  > coil. Currently, I have around 1300 watts of
> power
>  > available, a 6.312" x 28.375" secondary with 24
> ga
>  > wire. I am currently on the design phase for the
>  > primary, and have a few questions. First, I see
> that
>  > most people are using 1/4" copper pipe. The
> problem
>  > is, for me to get 60' of pipe its gonna cost
> me... I
>  > did find some 3/8" pipe in a 60' roll for
> $20(us).
>  > Here's my question, I would assume, that the
> larger
>  > the pipe you use the more 'driving' power it
> takes to
>  > create a magnetic field? The same thing goes for
> the
>  > spacing, I see that the further I space the
> windings,
>  > I get more inductance per turn. Thus again, I
> would
>  > assume more 'driving' power to get the same
> magnetic
>  > field.
>  >
>  > So, for my application, (around 1300 watts, 3
> NST's
>  > paralleled) is 3/8" pipe a bit to large?
>  >
>  > Also, as for cutting 'slots' in acrylic to make
> the
>  > standoffs for the primary, how did you guys cut
> them,
>  > just with a table saw and fence?
>  >
>  > Thanks in advance,
>  > ~Blimpie
>  >
>  >
>
>
>

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