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Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617
Damn those look awesome!! I want some!! I could definitely use both sizes as well. You should mass produce these, it's your calling. I would be willing to buy a few dozen.
Registered Member #125
Joined: Fri Feb 10 2006, 01:52PM
Location: Aalborg, Denmark
Posts: 155
Thanks all.
Marko,
Yes with my â€magic†spinning stick and a lathe:-)
Goldsphere,
It`s made out of 1mm copper plate.
Shan,
The first 3 forms I made are steel mandrels, but it was a pain in the ass to make… So now I use hardwood (oak) for the mandrels. I use a little cutting oil as lubricant, it’s a little messy but it works great. And it’s easy to remove the oil when I’m done with the spinning part.
I flame solder the two parts together, because I think it looks a lot better…
Derek L,
Are you blind, or …
Here are some pictures and a new video of the 195*50mm toroid.
Video
Pictures of toroid(s) and mandrels:
Maybe I will sell a few toroids next year. But I don’t want to make a whole lot of toroids, if I can’t sell any of them...
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Daniel -
A few more questions on your beautiful copper toroids -
1. Do you start with fully-annealed 1mm copper sheet, or is it just in the as-rolled condition? 2. Do you need to stop and anneal the shell part-way through the spinning operation? 3. When soldering the two shells together, do you add any kind of alignment features to one of the shells, or use some sort of holding/alignment fixture, or just set one shell on top of the other and use a steady hand? 4. When you say "solder", do you mean conventional tin/lead solder, high-temperature silver solder, tin-based lead-free solder as used for copper water pipes, or something else? 5. Is the tip of your form tool just a polished full-radius?
Registered Member #125
Joined: Fri Feb 10 2006, 01:52PM
Location: Aalborg, Denmark
Posts: 155
Derek L,
Surry about my misunderstanding…
Shan,
I think a little googling would answer most of your questions…
Zb,
The price for one of the bigger toroids is 140$, this price is with shipping in Europe. You have to pre-order the toroids, so I can make an overview of how many I have to make.
And the price for one of the small ones is 30$, and you can get two for 50$ without shipping. I don’t intend to run more than one production of these.
The toroids are spin polished and soldered together.
If people are interested in the toroids, I think this thread should be moved to Sale and Trade.
Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
Dang, that is a bit out of my price range I can't justify spending 140 bucks on a toroid (and I do realize it's not a bad price, at all). Putting that toroid on would probably double the value of the coil.
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DIY spun toroids
I can't justify spending 140 bucks on a toroid (and I do realize it's not a bad price, at all). Putting that toroid on would probably double the value of the coil. 
I think it would raise the value of my coil a few orders of magnitude..