RE: Coil Form needed

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

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