[TheForge] propane vs coal vs charcoal

[Bruce Freeman]

That is NOT an ice cube they're showing in that video.  It's not clear
what it is.  For induction heating to work it must be conductive.
Bruce
NJ

On Tue, Jun 10, 2008 at 5:47 PM, Ben Barrett <stircrazyben at gmail.com> wrote:
> 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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-- 
Bruce
NJ