Re: Coil Form needed

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

Original poster: robert & june heidlebaugh <rheidlebaugh-at-desertgate-dot-com> 

Arpit; I use a scrap of 2x4 wood as a winding center for coils up to 1 meter
diameter, no end caps. When finished throw the scrap of wood away cost is
less thas 2$. Big coils require two scraps of wood nailed into an x shape.
     Robert   H
-- 


 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Thu, 13 May 2004 08:02:29 -0600
 > To: tesla-at-pupman-dot-com
 > Subject: RE: Coil Form needed
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Thu, 13 May 2004 08:09:20 -0600
 >
 > 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
 >
 >