Author Topic: Isn't there a better way to make a custom toroid?  (Read 381 times)

Offline Downunder35m

  • High Voltage Enthusiast
  • *
  • Posts: 25
  • Karma: +1/-2
    • View Profile
Isn't there a better way to make a custom toroid?
« on: August 04, 2018, 06:00:31 AM »
I looked around for sources of more or less well fabricated toroids.
Nothing in copper of course but at least some are available in aluminium.
But IMHO the prices I have seen do not justify the high price.
Back in my big spark gap days I mainly use tube cages or in some cases stianless steel spheres as a stack.
For a desktop model however this is not to my liking as one day I would like to have something that not just works but also looks nice.
On my tiny lathe I could try to make forms for rolling my own toroids but only to about a diameter of 15cm, thanks to being a tiny lathe...
So what other options for something with a really smooth and nice look are there that can be done on a hobby level?

Ducting, no...
Polystyrene rings, maybe but still a ton of work and definately not easy to get a mirror finnish...
Baking dishes, again maybe but hard to find something that would make a true donut or better still a toroid without major surgery.
And while doing all sorts of weird Ebay searches I found something that might be worth to consider.

What about 180° pipes?
Commonly used for cars and exhaust system in 3 and 4" but certainly also used in oher areas and diameters.
For some configurations it should be possible to get a suitable radius and pipe diameter to make a decent toroid...
But still not really something for a custom creation to fit a specific coil...
Or does anyone happen to know how to get a 60mm copper pipe into a smooth ring?
1.2mm thick walls too LOL

So I thought it should be possible to combine pipe bending with a slightly different cage cage design.
Sure someone has done it before but I could not find any references, so I will try to explain it:
If we take standard copper plumbing tubing then we can use springs or fill it with sand to bend it into any diameter the pipe allows for.
Using a suitable template like a PVC pipe, thick carboard tube or just wooden disks it should easy to create rings that create a donut from several copper rings.
Correct me if I am wrong but the "grooves" between the pipes should not be a problem for arcs as the pointy bit faces inwards?
And yes, I know that such a design would be really heavy but if done well it should look really nice once polished ;)

Last though: Conductive paint and/or electroplating/electrolyse things?
Every time I am welding stuff that needs corrosion protection I use zink or aluminium spray that also allwos to weld through if required later.
At least the aluminium type gives a semi gloss to satin result on smooth surfaces.
The zink based stuff looks more like a surface powdered in grey.
From experiments I know that for copper plating zink I need a cyanide based first plating bath and won't go that route again.
Aluminium should be straight forwards at least in theory.
During my tests I noticed that the aluminium parts often oxidise faster than what I am able to clean and move.
Was a race of often 10 or more rounds until I got an even coating of copper all around bigger parts.
But using aluminium spray as a base for this??
Proper paint that is conductive enough and not carbon based cost a small fortune...
Not to mention the problem of keeping a very light toroid submersed or being able to remove the filling when done without causing damage...

There must be an easy and relatively cheap way to make a proper toroid with a copper finnish that does not involve machining or expensive tools.
So what did I miss?
Would it make a difference if inside the toroid is a solid disk or just wires like on a bicycle wheel?

Offline Nijin

  • High Voltage Enthusiast
  • *
  • Posts: 15
  • Karma: +1/-0
    • View Profile
Re: Isn't there a better way to make a custom toroid?
« Reply #1 on: August 04, 2018, 11:25:14 AM »
I recommend you to make a toroid with multiple aluminium pipe. You can design it with JavaTC3D "ring toroid". This type of toroid has a greatter surface, a better look and you can adjust both diameter of the toroid.

I made a 104*28cm toroid with 7x 30mm alumimium pipes and It's the best toroid I've made even if bending 30mm pipe is very difficult. I recommend you to use more pipes with a lower diameter like 6 or 10mm depending the size of your toroid.

If you want more information about this type of toroid, you can check the facebook of Franzoli Electronics.
Everything is a fuse if you pass enough current

Offline Downunder35m

  • High Voltage Enthusiast
  • *
  • Posts: 25
  • Karma: +1/-2
    • View Profile
Re: Isn't there a better way to make a custom toroid?
« Reply #2 on: August 04, 2018, 07:16:57 PM »
So you are saying that apart from looks there is no realy benefit?
Id a pipe cage performs as good as a real toroid then I might have to reconsider my approach and go for simple instead.

Offline Nijin

  • High Voltage Enthusiast
  • *
  • Posts: 15
  • Karma: +1/-0
    • View Profile
Re: Isn't there a better way to make a custom toroid?
« Reply #3 on: August 04, 2018, 07:22:38 PM »
No, the most inportant benefit is the simplicity and the cost to make this kind of toroid. A spun toroid is difficult to find and expensive. With a skeleton toroid, you can adjust the height and the width and this will change electrical properties of the toroid.
Everything is a fuse if you pass enough current

High Voltage Forum

Re: Isn't there a better way to make a custom toroid?
« Reply #3 on: August 04, 2018, 07:22:38 PM »

 


* Recent Topics and Posts

post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
Today at 01:50:47 AM
post Re: Chinese MOSFETS/IGBTS
[Solid state Tesla coils]
Hydron
Today at 12:11:10 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
badpeter
March 22, 2019, 08:19:21 PM
post Re: Chinese MOSFETS/IGBTS
[Solid state Tesla coils]
profdc9
March 22, 2019, 06:39:37 PM
post Chinese MOSFETS/IGBTS
[Solid state Tesla coils]
Fumeaux
March 22, 2019, 05:51:55 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
March 22, 2019, 03:46:16 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
kamelryttarn
March 22, 2019, 11:25:19 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Mads Barnkob
March 22, 2019, 10:56:16 AM
post Re: looking for PCB creating software
[Printed Circuit Board]
Teravolt
March 22, 2019, 06:02:15 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
badpeter
March 21, 2019, 11:04:48 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Hydron
March 21, 2019, 07:51:23 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
badpeter
March 21, 2019, 07:09:05 PM
post Re: looking for PCB creating software
[Printed Circuit Board]
kamelryttarn
March 21, 2019, 02:26:09 PM
post Re: GDT Experiments
[Solid state Tesla coils]
Uspring
March 21, 2019, 11:57:53 AM
post Re: GDT Experiments
[Solid state Tesla coils]
Teravolt
March 20, 2019, 11:15:50 PM
post Re: GDT Experiments
[Solid state Tesla coils]
Thunderstruck
March 20, 2019, 09:07:04 PM
post Re: Keep or throw away ?
[Beginners]
Teravolt
March 20, 2019, 05:18:07 PM
post Re: New small SSTC
[Solid state Tesla coils]
Bambinz
March 20, 2019, 03:52:15 PM
post Re: New small SSTC
[Solid state Tesla coils]
Mads Barnkob
March 20, 2019, 01:23:52 PM
post Re: GDT Experiments
[Solid state Tesla coils]
T3sl4co1l
March 20, 2019, 01:18:29 PM
post Re: GDT Experiments
[Solid state Tesla coils]
Mads Barnkob
March 20, 2019, 01:06:24 PM
post Re: cute-qcw Tesla Coil
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
March 20, 2019, 01:00:46 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Mads Barnkob
March 20, 2019, 12:41:22 PM
post Re: Keep or throw away ?
[Beginners]
Thunderstruck
March 19, 2019, 10:02:41 PM
post Re: Keep or throw away ?
[Beginners]
Hydron
March 19, 2019, 08:14:33 PM
post Re: Keep or throw away ?
[Beginners]
Teravolt
March 19, 2019, 05:12:03 PM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
Experimentonomen
March 19, 2019, 01:32:32 PM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
Mads Barnkob
March 19, 2019, 12:20:34 PM
post Re: Strange gdt waveforms
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
March 19, 2019, 12:15:22 PM
post Re: Which varnish to use to coat the Secondary?
[Solid state Tesla coils]
Mads Barnkob
March 19, 2019, 10:46:50 AM
post Re: Keep or throw away ?
[Beginners]
Thunderstruck
March 19, 2019, 09:11:09 AM
post Re: Keep or throw away ?
[Beginners]
Mads Barnkob
March 19, 2019, 08:24:31 AM
post Re: Keep or throw away ?
[Beginners]
Teravolt
March 19, 2019, 01:51:51 AM
post Re: Keep or throw away ?
[Beginners]
Thunderstruck
March 18, 2019, 09:56:42 PM
post Re: cute-qcw Tesla Coil
[Dual Resonant Solid State Tesla coils]
Weston
March 18, 2019, 07:55:52 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
petespaco
March 18, 2019, 06:11:07 PM
post Re: Strange gdt waveforms
[Dual Resonant Solid State Tesla coils]
Hydron
March 18, 2019, 02:27:35 PM
post Re: cute-qcw Tesla Coil
[Dual Resonant Solid State Tesla coils]
Uspring
March 18, 2019, 12:52:35 PM
post Re: Strange gdt waveforms
[Dual Resonant Solid State Tesla coils]
FilipŠebík
March 18, 2019, 12:22:58 PM
post New small SSTC
[Solid state Tesla coils]
Bambinz
March 18, 2019, 11:46:18 AM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
Bambinz
March 18, 2019, 11:29:02 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Mads Barnkob
March 18, 2019, 10:35:04 AM
post Re: Strange gdt waveforms
[Dual Resonant Solid State Tesla coils]
Marty
March 18, 2019, 05:32:43 AM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
Experimentonomen
March 17, 2019, 09:13:47 PM
post Re: DRSSTC Driver Logic
[Dual Resonant Solid State Tesla coils]
Netzpfuscher
March 17, 2019, 04:08:33 PM
post Re: WTB: Large Heatsink with a Baseplate at least 10mm thick
[Sell / Buy / Trade]
Phoenix
March 17, 2019, 02:46:44 PM
post Re: cute-qcw Tesla Coil
[Dual Resonant Solid State Tesla coils]
flyglas
March 17, 2019, 02:21:45 PM
post Re: DRSSTC Driver Logic
[Dual Resonant Solid State Tesla coils]
Laci
March 17, 2019, 01:54:47 PM
post Re: WTB: Large Heatsink with a Baseplate at least 10mm thick
[Sell / Buy / Trade]
Mads Barnkob
March 17, 2019, 10:15:16 AM
post Re: Which varnish to use to coat the Secondary?
[Solid state Tesla coils]
FilipŠebík
March 17, 2019, 09:33:50 AM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30