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RE: Coil Form needed 2
Original poster: "Gary Weaver" <gary350-at-earthlink-dot-net>
This might be worth mentioning. About 3 or 4 years ago I posted this
information on the TC list so it may be in the archives someplace. It has
been so long ago I have forgotten all the details. I did an experiment to
see if a large coil could be built using small diameter pvc pipe because
large pipe is expensive and hard to find. I wound 3 identical secondary
coils, connected them all in parallel in the center of one flat wound
primary coil. I placed a toroid on top and fired it up. It worked
excellent. Then I build one large diameter secondary coil to replace the 3
parallel coils the fired it up again using the same primary coil, same cap,
same spark gap, same chokes, same transformer, same toroid, same size
enamel coated copper wire. As I recall the output sparks were about the
same on both experiments. I had planned to build 6 identical secondary
coils and connect them all in parallel but never got around to doing that.
If you are thinking about building a large coil and can not find any large
pvc pipe give this experiment some thought.
Gary Weaver
gary350-at-earthlink-dot-net
Why Wait? Move to EarthLink.
> [Original Message]
> From: Tesla list <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Date: 5/13/2004 3:23:35 PM
> Subject: RE: Coil Form needed
>
> Original poster: "making lightning comcast" <makinglightning-at-comcast-dot-net>
>
> I put 2x4's in the form of a cross on the inside of the ends, then
drilled a
> hole through the middle with a pipe going through the middle.
> I use bungee cords sewed together that wrap around the tube and then down
to
> a geared motor. I put a layer of friction tape on the end of the tube for
> the bungee cord to grip on.
>
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Thursday, May 13, 2004 10:02 AM
> To: tesla-at-pupman-dot-com
> Subject: RE: Coil Form needed
>
> Original poster: "Arpit Thomas" <arpit-at-inzo-dot-org>
>
> wow, thats not bad at all! I paid 20 dollars for one metre of 6 inch pipe
:/
> So where do you get the end caps for them? I'm assuming you'll need end
> caps so you can atach it to a winding machine. 6 inch end caps are about
25
> bucks each at the local hardware store- all the 6 inch fittings are very
> expensive.
>
> *********** REPLY SEPARATOR ***********
>
> On 12/05/2004 at 10:00 PM Tesla list wrote:
>
> >Original poster: "makinglightning comcast"
<makinglightning-at-comcast-dot-net>
> >
> >Paul,
> >
> >I have been able to go to a construction site and just ask some guys
there
> >for a piece. Usually an 80 foot 12" is just scrap to them. I got 2 12"
15
> >footers for a case of Bud once. I got a 12' 18" one for free also.
Those
> >are
> >harder to come by, but the 12" ones are used all the time in new
> >subdivisions and commercial buildings. They sure are building a lot
> >nowadays, so it should be easy for just about anyone to do this.
> >
> >Kevin
> >
> >-----Original Message-----
> >From: Tesla list [mailto:tesla-at-pupman-dot-com]
> >Sent: Wednesday, May 12, 2004 6:03 PM
> >To: tesla-at-pupman-dot-com
> >Subject: Re: Coil Form needed
> >
> >Original poster: DRIEBEN-at-midsouth.rr-dot-com
> >
> >
> >
> >----- Original Message -----
> >From: Tesla list <tesla-at-pupman-dot-com>
> >Date: Wednesday, May 12, 2004 9:20 am
> >Subject: Coil Form needed
> >
> > > Original poster: "Paul Marshall" <klugmann-at-hotmail-dot-com>
> > >
> > > I am looking for a coil form 12" or greater diameter. The length
> > > should be
> > > about 4 times the diameter. Also I am planning on using a 40kV
> > > .5uF
> > > capacitor for the tank circuit. I have a 25kVA pig to drive it.
> > > Has anyone
> > > on the list ever used that much capacitance in their tank circuit ?
> > >
> > >
> > >
> > > Paul S. Marshall
> >
> >Paul,
> >
> >I would think that 0.5 uFD would be way too large for
> >anything except maybe for an Electrum sized coil. The
> >biggest cap that I've used so far is .0825 uFD, but I
> >do now have (2) 0.1 uFD, 50 kV Hipotronics custom Tes-
> >la caps that I got from Jeff Parrise of KVA Effects.
> >I plan on using one of these for my future BIG coil
> >project and driving it with a 15 kVA pig.
> >
> >As for large diametered secondary coil forms, I was
> >able to get gray PVC ducting pipe from a local plas-
> >tics supplier. I had picked 12" but they had 18" too.
> >Of course it was quite pricey, though. I payed over $5
> >a foot for the 12" and I'd hate to even ask how much
> >the 18" was ;^0 Another cheaper alternative is the
> >concrete former tubes. They are cardboard and are
> >considered to not be the best form material due to
> >higher lossiness and low Q, but if thuroughly dried
> >and varnished, they do work. I know from experience.
> >My biggest coil to date used a 12" dia cardboard
> >"Quiktube" concrete fromer from Home Depot and it
> >was only about 38.5" long but gave 8 to 10 ft. sparks
> >from a 9x30 toroid and driven by a 10 kVA pig (14.4 kV)
> >and with the aforementioned .0825 uFD primary capa-
> >citance and a homemade lexan and brass RSG.
> >I've seen 24" concrete formers at construction sites
> >so you could definitely build a large coil with one
> >of these.
> >
> >David Rieben
>