[TheForge] On the table monday.

[Peter Fels And Phoebe Palmer]

Wouldn't a downdraft style stack, like in pottery kilns, solve 
both the aspiration and dragon's breath problems?
I'm assuming that one could choke either the stack or the air 
intake to get a slight positive pressure and reducing atmosphere.

Jerry Frost wrote:
> 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
>>
>>
> 
> _______________________________________________
> Manage membership or unsubscribe at:
> http://mailman.qth.net/mailman/listinfo/theforge
> theforge mail list group photo site is
> http://www.photoaccess.com
> Login:  blacksmithblacksmith at hotmail.com
> password:  anvil
> ___________
> 
> 
> 
>