[TheForge] On the table monday.

[Jerry Frost]

I'd been thinking about, sketching and playing with 
Leggo blocks for some time trying to come up with a 
baffle system to do what you describe. Or at least I 
think it was what you're talking about. I didn't get a 
Leggo model to actually work very well though.

I don't recall who on this list suggested the air 
curtain but it pretty much ended my playing with the 
baffles. Of course it requires a gun burner forge but 
I'm a lot less concerned with combustion by products in 
the portable. The shop forge on the other hand is going 
to be a relatively permanent indoor installation.

My experiments with baffles were not only incomplete 
but blowing smoke into a Leggo model probably isn't 
such a good model. It did model a recuperative (double) 
wall pretty well though so maybe they were working 
better than I thought but I don't know. What I did 
determine about the recuperative wall forge is it 
better be a shop forge as it's going to be pretty big. 
The total thickness of the forge walls is a much larger 
percentage of the over all forge size. Just adding a 
1/2" annulus adds about 1 1/2" to the wall thickness or 
3" to the OD of the forge. anyway, the bigger the 
furnace, the more practical a recuperative wall 
becomes.

Being able to close the doors on a forge for better 
heat and reduced fuel consumption are also excellent 
arguments for gun burners. With the doors closed even 
partially the baffle system in my Leggo models worked 
well. Of course if I closed the door all the way it 
didn't need baffles at all.

I've always thought the burner nozzles should be aimed 
to keep the fire in the forge as long as possible.

Frosty
-------------------------------
If it ain't forged
it ain't real.
Wrought iron is.
The FrostWorks

Meadow Lakes, AK.

http://www.artmetalradio.com/

From: "Kathy" <keporter at comcast.net>


> Frosty,
> I had not even considered an air curtain. I am 
> planning on combining an internal
> shoulder (ring of refractory to compress the flame 
> path's spiral) with a two
> (upper and lower) part external baffle. The lower 
> half is affixed to the forge
> and uses a half ring to prevent exhaust from escaping 
> any way but upward, .while
> still allowing the baffle to be placed at a 1 1/2" 
> distance beyond the forge
> opening. The upper half is movable and has a small 
> opening at its base for stock
> to be slid through it; to insert or remove scroll 
> ends, the upper baffle slides
> up and down.  Escaping IR is bounced back into the 
> forge, and exhaust gases are
> forced upward and away from the operator. The back 
> end of the forge has a small
> hinged door, allowing stock to protrude from both of 
> the forge's ends, but
> remaining closed most of the time. Running the forge 
> with a single opening most
> of the time allows the burner or burners to be aimed 
> at a backwards facing
> tangent, increasing hang time for the spiraling 
> gases.
> Mikey
>
>