Induction brass annealer

[normmatzen]

For my ANNIE I made a coil with the same geometry as the factory 4 turn Litz wire coil for use in the gapped Ferrite core work coil.
I used #4 hard copper wire. #4 copper wire has a diameter of 0.204" I know the story is that Litz wire has much reduced skin effect to raise circuit "Q", but I think the frequencies we are using, the overall circuit reactance is still dependent on coil resistance. As an example, 6 inches of #4 wire has a resistance of 124 micro Ohms! No wonder I couldn't measure the resistance with my very accurate meter!
This coil works better than the Litz wire one for heavy cases!
For reference, Fluxeon now sells a water cooled coil with 6 turns that is not wrapped around a core, simply an air coil. This one, you can stand a case inside the coil and the inductive forces will center the case! This coil has the same form factor as the units portrayed in the pictures above.

 

[JasonT]

Norm - can we see a picture of what you made? How many inches of wire did you use? I'm itching to try this but don't want to blow up all my meanwell power supplies!

 

[Gina1]

JasonT hold off, I will be pubilshing the first part of my Induction annealer build tomorrow afternoon. It will have parts list and suppliers. How it works, how to make the coil/size. As well as tips and ideas. Think you will find it interesting. Will be under a new thread called "induction brass annealer-redux"
If you look at hollywood's video, in this thread, the one I built operates the same way with the trap door.
Gina1

 

[boltfluter]

Gina,

Your annealed cases look absolutely perfect. Looking forward to your upcoming article. Should be a great read.

Regards, Paul

www.boltfluting.com

 

[Gina1]

Thank you

 

[Gina1]

See new thread "redux"

 

[normmatzen]

JasonT, and others,

If I am successful, below will be a photo of my home-made hard wire work coil for my Annie. It is four turns just like the coil that came with my Annie and I put it on the original square two piece Ferrite core with gap. The length of the wire is ~14", but I would start with 18" and trip to length when done.
I slipped on some fiberglass insulation sleeving that I bought from Fluxeon (I think). It was kind of hard to wind the coil so I think it may be wise to heat the wire first with a torch to red hot to anneal it so it bends easier. As the coil diam and spacing as well as number of turns


is exactly like the Fluxeon Litz wire coil, the inductance of the coil and current ratio will be just like the original but with some what less copper losses due to the solid wire being lower resistance than the Litz wire coil. I doubt is the improvement of skin effect with the Litz wire is significant for the operating frequency of the Annie.

Good luck!

 

[normmatzen]

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