[TheForge] Re: Induction Forge?

[Darrell]

On shorting out of coils, the unit that Grant sells has an auto-shutoff in 
case of a short. Then you just have to cycle the power and it is running 
again.

Darrell

----- Original Message ----- 
From: "James Binnion" <jbin at well.com>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Saturday, August 19, 2006 1:46 PM
Subject: Re: [TheForge] Re: Induction Forge?


> The field strength falls off by the square of the distance, so unless  you 
> managed to get your torso into the coil or held the coil right  next to 
> the chest you would no get any significant energy into bone  pins or leads 
> of pacemakers. This is nothing like a MRI unit in field  strength.
>
> This rapid decrease in field strength is one of the main drawbacks of  the 
> induction heating of stock. The heating efficiency falls off  dramatically 
> with distance so that you need to make your coils come  as close as 
> possible to the item you want to heat with out touching  it (you don't 
> want to short out the coil) if you want to couple much  power into the 
> work.
>
> I saw this unit at Seattle and it is definitely on my wish list. At  $3800 
> it is about 10 times less expensive than the ones I have seen  before.
>
> Jim
>
> On Aug 19, 2006, at 3:49 AM, Steve Smith wrote:
>
>> Good point Mike.
>>
>> Steve
>> who will get this project far enough to see some results in about  eight 
>> years
>>
>> Mike Spencer wrote:
>>
>>> sos> Apart from exploding tooth fillings there are a couple of less
>>> sos> obvious hazards.
>>> How about steel pins in the bones and epicardial pacemaker leads? [1]
>>> I had a chance to take part in pour of several pounds of aluminum at
>>> MIT, a demo for visiting high school students from Roxbury.  They  were
>>> to use an induction outfit that would do the melt in, IIRC, a few
>>> seconds.  I opted to leave the building because no one had a clue
>>> about the effect of large high frequency magnetic fields on the
>>> pacemaker lead. [2]
>>> - Mike
>>> [1] Not to mention that the tiny, metal corkscrew tips of epicardial
>>>     leads typically break off after a few years and migrate within  the
>>>     body, usually doing no harm.  But having it yanked hither and yon
>>>     or heated to red would be a whole 'nother story.
>>> [2] No pacemaker, just the lead, for reasons too off topic to get  into
>>>     here.
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>
> James Binnion
> jbin at well.com
>
>
>
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