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Re: Big Toroids
Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
Hi Dave, all,
Agreed, and actually, even $800 sounds a bit steep to me. I
got a 30x9 toroid from O.W. Landergren via a Tesla list group
buy a few years back for ~$300. Group buys are defintely the
way to go to save some "dough" on medium to large spun toroids.
I think once spun AL toroids start getting significantly larger than
the 30 to 35" major diameter by 10 to 12" minor diameter range,
though, then the price (and the weight) starts to become
impractically high for hobby level coiling. In size ranges of this
caliber, "homemade"
units from large diameter AL "flex-duct" or chicken wire covered skeleton
frames are generally the toroids of choice for coilers on a fixed budget.
David Rieben
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, September 09, 2006 4:21 PM
Subject: Re: Big Toroids
Original poster: Dave Leddon <dave@xxxxxxxxxx>
$2000 for a 30x8 toroid sounds outrageous. Several years ago I
purchased a 32x8 toroid from Ross Engineering for $800.
http://www.rossengineeringcorp.com/toroids_spheres_corona_nuts.htm
I wonder if they would entertain the idea of a group buy.
Dave
Pleasanton, Ca
At 11:30 PM 9/8/2006, you wrote:
Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>
O W Lundgren. The big versions of the usual smaller spun toroids
for table top coils will probably require a 2nd mortgage. I think
they want something like $2000 for an 8x30 with the cost going up
faster than the volume of the toroid itself (cubed). Hence why you
don't see many big ones outside professional companies and the rest
of us resort to using chicken wire/plywood. At some point there's
really no advantage of spun over handmade chickenwire/plywood from
an electric field point of view, just looks better and cost
thousands more. Even if I was a millionaire I'd be extraordinarily
depressed if I accidently dropped it (probably easy to do with the
big/awkward ones). If anyone on the list would make ~8x30's and
sell for $400-500 that would be a bargain.
Mike