Re: [CAD_CAM_EDM_DRO] Re: melting aluminium

Hello Smoke,
Start to make the generator plant on your families farm to power that oven.
Industrial aluminium plants use minimum 150.000 Amp pulsed DC.
The laboratory inductive centrifuges I repair frequently use 4 kW at 4500 volt
(transformer 9000 Volt) pulsed DC at 1,3 to 1,5 megahertz.
For to melt maximum 50 gram of chrome cobalt odontologic metal.
Time needed to get it to its bubbling (1700? degree celsius) is 2 to 3 minutes.
To reheat it from yellow gleam (after you mounted the mold) to melted 50 seconds.
The Radio amplifier tube cost only 2000 Bucks. The machine around 6 to 10.000$.
The result is marvellous: no bubbles, good finish in every detail.
But only applicable in small pieces.

If you are interested get yourself from some odontological laboratory or jeweller
a used Dentaurum Megapuls 100. If it is shot they give it away for 1000$ or less.
But only if the tube and the ceramic capacitors are ok a reconstruction is worth it.
I could help you with the electric plan and nearly all possible repairs.
Good Luck
Sven Peter



Smoke wrote:

> One of you electrical geniuses want to try figuring out how much electrical
> power I'd need to melt aluminum using an AC magnetic field? Maybe I could
> build myself a simple electric melting furnace and be able to get my
> castings for the CNC (and other) machines done a lot quicker. Perhaps my
> portable generator and a step up transformer could be used as the main power
> source?
>
> Smoke
>
> >I remember from my school physics classes a similar demonstration, but with
> >an alternating field. The apparatus was a U-shaped iron armature, with a
> >coil on one arm & an aluminium ring dropped over the other arm. When the
> >coil was energized with mains AC, the aluminium ring shot upwards off its
> >arm of the the armature, hitting the ceiling. Great fun!
> >
>
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