[TheForge] propane vs coal vs charcoal

[Ben Barrett]

Energy-wise, I've heard it is by far the most efficient.... but we
just don't have good batteries engineered so they're still all
grid-needy.... that I've seen.
I think $4k will get you a brand new unit.
See youtube example for the speed of the heat here:
http://www.youtube.com/watch?v=GCc2VYbwo08 (sideways)
another induction heating demo here, but someone please tell me that
the ice has iron filings in it??!   I've put my finger inside one of
these coils when on, they require something ferrous or at least
magnetic material that will respond to magnetic field IIRC....
http://www.youtube.com/watch?v=aLwaPP9cxT4&feature=related  (red hot
ice cube, "cool")    WTF, water is conductive and salt-water even more
so, what is this "ice" they get red-hot??  It *might* just be the coil
itself getting bright-hot and shining through the ice?  See the flames
pick up there?  Very strange imo... I mean some sublimation I might
expect, but what is flaming?  They're not breaking the H2O bonds
AFAIK...anywhoo.  I think there are possibly more induction-heating
tinkerers out there, outside of the BS community :)

The unit I've seen is online at Kayne's store:
http://www.blacksmithsdepot.com/Templates/cart_templates/cart-detail.php?theLocation=/Resources/Products/Forges_and_Parts/OC_Induction_Forge/OC_Induction_Forge_Basic_Kit&where=

I've seen some old docs on how to build these, but I think modern
mosfets have made it a little easier.... they're high voltage & high
frequency, if I understand correctly, so some of the same field-based
dangers that exist for TIG welders and Tesla coils and such, exist.

cheerio,

Ben



On Tue, Jun 10, 2008 at 2:06 PM, Jim Beard <regionalchaos at gmail.com> wrote:
> I've heard this is expensive.  Does anyone have any numbers on it?
>
> On Tue, Jun 10, 2008 at 2:01 PM, Gabriel Cain <gabriel at dreamingcrow.com> wrote:
>>
>> Why not consider electro-inductive heating?   Last summer, I saw a
>> demonstration of this at Dave Lisch's shop in Seattle last summer.   It's
>> very neat.
>>
>>
>> -Gabriel
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