RE: Coil Form needed

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

Original poster: Yurtle Turtle <yurtle_t-at-yahoo-dot-com> 

No need for endcaps for winding. See:

http://www.hot-streamer-dot-com/adam/temp/Coil02.jpg

for what I did on my free 10" form. Though hard to
see, I just used two 2" x 4" boards on each end.

I also got a free 16" pvc form, which I may wind when
I get a little more room.

As to an endcap to support the topload, mcmaster-dot-com
or grainger-dot-com, as well as number of plastics
suppliers, can provide 1" thick pcv sheets.

Adam

--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > 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
 >
 >