RE: Toroids, point taken on flex duct:-) I did want a better "toroid"

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Terrell Fritz <terrellfone@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

The fixed "X" rods (actually tubes) are 3/8 inch OD hollow brass and 
the sliders are just 3/8 inch ID tubes from the hobby store.  Often 
Ace hardware also carries K&S tubing.

http://www.ksmetals.com/HobbyMerchandisers/metal_center.asp?Title=Hobby_Merchandisers

It is 0.032 inch wall...  McMaster probably has it too, but the K&S 
is just the right size and cheaper.

The balls I have are eight inches but they are available from 4 
inches to like 30 inches in two inch increments.

The center ball is a big brass machine knob from McMaster with offset 
3/8 cross holes drilled in it.

http://drsstc.com/~piranha/p-2/bttl/BigSpheres.JPG

Just up the size of the existing hole in the balls to 3/8+ inch and 
epoxy the big tubes in for telescoping sliders on the 3/8 OD 
rods.  You can search here for all threads on gazing ball terminals and such.

http://www.pupman.com/htsearch.html

Lots of pictures here:

http://drsstc.com/~piranha/p-2/bttl/

Cheers,

        Terry



At 12:15 AM 3/3/2007, you wrote:
> Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>
>
> Terry,
>
> What size gazing balls are you using and did you have to have the
> rod/sleeves machined? I know you described the building of these and
> drilling and attachment awhile ago, I'm not sure where to find it. You have
> copious documentation!
>
> Ok, so can you give us a hint, what lenght arcs will your dual MOT make?
>
> Thanks,
> Jim Mora
>
>
> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Friday, March 02, 2007 7:35 PM
> To: tesla@xxxxxxxxxx
> Subject: Re: Toroids
>
> Original poster: Terrell Fritz <terrellfone@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Hi Dave,
>
> Here is the corona spraying off the top terminal with the balls just
> below breakout with the balls way too high...
>
> http://drsstc.com/~piranha/p-2/bttl/BallTest-3.JPG
>
> The spray was very even and nice as expected in such a case.  The
> balls really do have a very toroid like field pattern.
>
> http://drsstc.com/~piranha/p-2/bttl/newcoil-00.jpg
>
> http://drsstc.com/~piranha/p-2/bttl/newcoil-01.jpg
>
> The balls are mounted by tubes that can slide in and out an a spider
> frame to adjust major diameter:
>
> http://drsstc.com/~piranha/p-2/bttl/BigSpheres.JPG
>
> http://drsstc.com/~piranha/p-2/bttl/TerminalTuning.JPG
>
> http://drsstc.com/~piranha/p-2/bttl/TerminalTuning.gif
>
> Waterscapes, Krupps,...  I hope we are not killing these venders with
> giant orders like we did with MMCs and IGBTs ;-)))   I think Krupp's
> is out of bare stainless steel balls now too =:O  I sure am glade "I"
> get mine "first" ;-)))
>
> BTW - The new PIRANHA site is pretty much back all "rearranged"
> now...  It took me "all day" (I am not good at web page
> stuff...)  Sorry, but I think I killed the old links in this thread...
>
> http://drsstc.com/~piranha/
>
> Hopefully this will be a more well thought out and stable site...  I
> hardly wrote anything down for the OLTC...  Probably wrote "too much"
> down for PIRANHA...  But the new site should be easily maintainable
> and extendable even for "me" :-p
>
> I should try to make an index of the pictures next...
>
> BBTW - Here are my 4 inch and 8 inch big dryer duct top terminals now :o))))
>
> http://drsstc.com/~piranha/p-2/bttl/OldDryerDuctTerminals.JPG
>
> Cheers,
>
>          Terry
>
>
>
>
>
>
> At 05:02 PM 3/2/2007, you wrote:
> >Original poster: "Dave" <dgoodfellow@xxxxxxxxxxxxxx>
> >
> >How do you expand a ball? I find that toroids do better at
> >controlling corona at the top turns of the secondary, where balls
> >need to be placed as low as possible, at the top of the secondary. A
> >coil would look great with an insulator between the secondary and
> >the ball, but the corona becomes unmanagable.
> >By the way, since Waterscapes stopped selling gazing balls at the
> >nice price, I have found the best overall price and service from Amazon.com
> >Best price for an 8" is from artywoods on ebay. Don't look up 8"
> >though, search stainless gazing, and you will see his 7.65" gazing
> >ball for about $18.00
> >
> >Cheers, Dave Goodfellow
> .........