[TheForge] On the table monday.

[Kathy]

Jerry,
Theoretically "X BTUs in X volume (out)" is correct. However, the applications
between gun burners and some tube burners differ drastically. Not to nag, but
complete primary flame combustion allows sealing of the burner portal, thus zero
secondary air contributes to dragon's breath at exhaust exit; instead, a good
deal more heat is expended within the firing chamber and less into the
operator's face...

However, you will quickly deduce that I'm nit picking :-) Your point is well
taken; if the gun burner is fine tuned and the forge is designed properly for
it, dragon's breath should not be a problem. That is a BIG if though. It is
likely that most of the designs simply suffer from a "let's just throw this
thing together fast and get to work" mentality. I think the glass blowers have
worked their way around dragon's breath pretty well in many of their glory hole
designs.

You wrote:
"If you're serious about reducing or eliminating 
dragon's breath, switch over to an oxy propane torch 
for high BTUs at low volume.

<grin>"

Actually, that is a very good direction to go, but I would use Chem-O-Lene to
soup up the propane, and ten percent oxygen enrichment in order to get the
Chem-O-Lene to burn properly. I would choose this method because I is cheap and
always has been :-) If I lived in a state (or foreign country) where butane is
available at low prices, than butane and oxygen enrichment would be my first
choice (as gun burners can handle butane's ugly side nicely, where tube burners
cannot).
Mikey

-----Original Message-----
From: theforge-bounces at mailman.qth.net [mailto:theforge-bounces at mailman.qth.net]
On Behalf Of Jerry Frost
Sent: Wednesday, April 25, 2007 12:28 PM
To: Sponsored by ABANA
Subject: Re: [TheForge] On the table monday.

Gun burners are very effective: they're easy to make, 
tune and use. So what's to discuss besides application 
specifics?

I have to disagree with your assessment of differing 
levels of dragon's breath though. If you want X BTUs in 
X volume you'll get X amount of dragon's breath 
regardless of whether it's naturally aspirated or a gun 
burner.

If you're serious about reducing or eliminating 
dragon's breath, switch over to an oxy propane torch 
for high BTUs at low volume.

<grin>

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 know this is going to sound strange coming from me, 
> but I was thinking about
> promoting a discussion of GUN BURNERS.
>
> Oh sure, I know, we didn't really believe that the 
> devious Dr. Frankenburner
> meant all those comments about no one shoe fits all; 
> he was really just
> schmoozing, right? Wrong; I'm a perfectly ruthless 
> person about tool designs;
> even my own. There are good reasons to keep fan blown 
> forge designs around, and
> I have every intention of exploring them this year. 
> Especially as I've figured a
> way around my primary objection to them-dragon's 
> breath. With movable exterior
> baffles in place of small direct exhaust openings, 
> the hot gases can be
> effectively directed away from the operator, opening 
> up natural gas burners to
> people, like myself, who don't believe in the 
> nobility of suffering for art's
> sake. Using such burners would also make the standard 
> low priced safety
> equipment practical for installation on forges, etc. 
> They won't work with my
> burners (flame speed is too high; it snuffs out pilot 
> lights).
>
> So, if anyone is interested in this conversation, I 
> have no contract restraints
> to muzzle my comments on the subject.
> Mikey
>
> 
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