[TheForge] 3D printers

Mon May 11 15:44:01 EDT 2015

High Current dc sources are not as bad as high frequency sources.  Certain frequencies tend to be worse than others.  I personally have had my hand go numb in a high frequency field, and I know of another fella who went temporarily blind when he stuck his head into a field.  As with much in life, we tend to tolerate lower levels because we don't notice them, or they don't "hurt" as much<G>. 

Electronic computer controls only control the power and frequency.  The amount of energy radiated into the nearby area (where you are standing<G>) are a function of the shape of the coil and the shape and size  of the metal being entered into it.  Those are not under computer control.<G>

Note-humor and reality at the same time.
900 Mhz-cell phone frequencies, are the OLD microwave oven frequency.
2.4 GHz-new wifi frequencies are right smack in the middle of microwave oven frequency coverage<G>.
At least these are relatively low power, though the cell phone is held awful close to the noggin, grin.

I like to measure things before I get near to them.  There is a free app for the ipad/iphone that measures magnetic fields. 

All the best

-----Original Message-----
From: TheForge [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Peter Fels & Phoebe Palmer
Sent: Monday, May 11, 2015 3:33 PM
To: Blacksmithing List Sponsored by ABANA
Subject: Re: [TheForge] 3D printers

As i recall there are electronic/puter controls on the unit itself.
As for personal exposure..most off us arc weld, tig weld, etc.
Just think of all the diseases that those electrical fields might have prevented!

On May 11, 2015, at 12:06 PM, Richardson, Grover <Grover.Richardson at gtri.gatech.edu> wrote:

Note- no one has said anything about rfi/emi from the induction coil heaters.  The coil is an antenna.  Yes, the metal inside gets most of the power, but a coil radiates pretty well outside of the coil as well.   I worry.  Nearby electronic watchs, cell phones, could easily be overwhelmed<G>.   Has anyone done measurements of fields nearby?  We use mu-metal to shield ourselves from stray fields of high intensity.  

-----Original Message-----
From: TheForge [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Peter Fels & Phoebe Palmer
Sent: Monday, May 11, 2015 2:22 PM
To: Blacksmithing List Sponsored by ABANA
Subject: Re: [TheForge] 3D printers

I suspect it warped both our thinking and would bet blacksmiths are over represented in it's ranks.
As an old guy, it makes it easier to deal with the roar of new tech.
Speaking of that. Gene Olsen brought one of the induction forges that Grant S first introduced, to the Western States Conference. Sure is nifty...Fast, concentrated heat! 
The price and cooling package is coming within reach and the unit is now more portable and compact.
I want one!

On May 11, 2015, at 10:38 AM, CGRAF <adveniam at att.net> wrote:

I was picturing just that, only the trucks are self driven and sent to the site by computer.  Flat lot to finished building before the first Organic shows up.

Maybe I read too much sci-fi. Then again maybe not.

Mike Graf

On 5/11/2015 12:32 PM, Peter Fels & Phoebe Palmer wrote:
> Imagining the rolling bridge crane rolling down the road to the building site with a whole parade of feedstock trucks following.
> The examples i've seen were just extruding concrete mixes, but they could well be laying down insulation inside the walls at the same time.
> Of course it isn't finished till it's printed the roof with gutters, solar hot water and photovoltaic panels.
> And NO, it's not allowed to print the wrought iron fence, gates, etc!!
> 
> On May 11, 2015, at 7:05 AM, CGRAF <adveniam at att.net> wrote:
> 
> I have to wonder if these things could be built a movable platform "robots" that would be capable of building something like this as a whole.
> Mike Graf
> 
> On 5/10/2015 12:21 PM, wmullett at bright.net wrote:
>> Architects are experimenting with 3D printing of building components and the Chinese have actually 3D printed real buildings:
>> http://www.archdaily.com/591331/chinese-company-creates-the-world-s-t
>> allest-3d-printed-building/
>> 
>> Walt Mullett
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