[TheForge] Burners

[theforge@mailman.qth.net]

In a message dated 3/10/2004 10:15:18 AM Pacific Standard Time, 
quahog@tds.net writes:
Finally got around to pulling out my set of plans.  The plans I have are 
the ones that are offered through ABANA.  In DRAWING 1 top left of the page 
is a cutaway of the burner.  Part listed as #16 is the twisted strip (0.06" 
thick) and is noted as having a 180degree twist.  Drawing 1 is a blowup of 
the upper  right quadrant of page two of the second page of prints.

Dave Brown

At 11:21 PM 3/9/04, you wrote:
>Dave Brown wrote:
>>...In the Sandia Recuperative forge design they have a twisted strip of 
>>metal in the mixing tube to induce turbulence to mix the gas...
>
   The BernzOMatic swirl torch line of air/acetylene venturi hand torches 
uses a cast part resembling a fan blade to accomplish good mix, although it is 
placed near the orifice instead of at the mixing tube's entrance (this is 
probably because of the increased likelihood of burn back with acetylene). There is 
a gas forge somewhere on the net that introduces natural gas and air at the 
base of a vertical column, which has two or three sets of internal blades to mix 
the rising gas/air mixture (methane is about a third lighter than air). Just 
recently a fellow joined a glass group at the same time I did, and I visited 
his burner site. He was using compressed air, introduced at the venturi opening 
to "soup up" the action of a burner. His air tube was introducing the air at 
an angle instead of straight in. This gave very good swirl to the mix. 
Evidence of it could be detected in the flame. Swirling the gas/air mix should not be 
underestimated as a method of enhancing performance.

I had a set of plans from ABANA for the Sandia forge, but am too cheap to 
build and maintain one. However, there is no doubt in my mind that a person who 
needs a box shaped forge, or just loves fine machinery could do no better than 
the Sandia (did I say that? Surely I never said something like that. Next, 
I'll be caught extolling the virtues of fan blown systems). Seriously, good 
engineering, properly executed, makes good tooling.  We do sports in tennis shoes, 
but they wouldn't go well with a tux. Choices are vital; they need to be 
maintained and refined.
Mikey
Of course Dave & I could still squabble over which is the tennis shoe and 
which belongs with the tux :o)
Mikey


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