[TheForge] re:burner question

Tue Dec 2 07:18:01 2003

I'm using one burner (3/4" body) on an 11"d x 14" long forge, 2" 
insulation. It works fine for me, but it might be viewed as marginal, 
especially if you want to weld. I used to have a 12"d x 18" forge--two 
burners was plenty. I used to point them tangent to the internal wall 
insulation (that swirl effect), but I find pointing them at the floor 
works just as well. I can't see pointing them up having any benefit.

I assemble the gas jet on a mandril I made on the lathe. Screw the 
mandril onto the 3/4" to 1 1/2" adapter, slip a collar (5/8" rod drilled 
for 1/8" brass pipe) on the end of the mandril (to hold the gas pipe 
with a set screw), weld a couple of small rods between the collar and 
the 3/4-1 1/2 adapter and I'm done. I use 1/8" brass pipe for the gas, 
coming in concentric with the adapter/collar assembly, with an end cap 
drilled for a jet (#58 worked fine at 5000 feet in Colorado, haven't 
tried it here in Maine yet).

If you buy the 3/4-1 1/2 adapter, put it on the end of a piece of pipe 
and spin it (at the store). I've found that they're often not terribly 
straight.

Clear as mud? Ask if it doesn't make sense,

Steve Smith

John Emmerling wrote:

> I've always been a fan of the blown burner school. A recent storm here 
> on the N.OR coast cost me 4-5 hrs today of lost forge time while the 
> power co and our local electricitian repaired the damage. So I've 
> decided to build a venturi forge and just sent LZ an order for stainless 
> burner flares. Thanks Larry! Any helpful construction hints? Do the 
> burners work better angled up? Some venturi forges I've seen  have hot 
> spots under the burners when they are mounted on top. Is there an 
> optimal distance to reduce that effect?  How many burners on a 12"l  x 
> 10" dia pipe forge using 2" kaowool?
> Thanks
> John Emmerling
> Gearhart Ironwerks
> 
> 
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