[TheForge] Small gas forge

[GHS]

Dave, would you be interested in using a
venturi from a Carrier furnace? (In
shot, naturally aspirated, short, easy
to mount, I'll check the price , but
even new should be cheap, or free at the
local scrap yard.)

Mike Graf

Dave Brown wrote:
> 
> I'm going to make a small gas forge with naturally aspirated burner (i.e.
> Bunsen Burner).  For the case I'm using a metal housing from an old GE
> 3/4hp electric motor.  It's 6.5" diameter, 7.25" long.  It will be lined
> with 1" Kaowool giving it a net 4.5" diameter.  Interior volume will be
> affected a little bit because I plan on using a piece of fire brick or
> piece of ceramic on the bottom for a floor.  Heck, I may even put in a hard
> cast refractory floor using some Mizzou (A.P. Green) refractory cement that
> I have handy.
> 
> Now the questions:
> 
> 1.  Will a burner using a 3/4" pipe be overkill for this small forge and
> should I consider making a smaller burner from 1/2" tubing/pipe?  The 4.5"
> net diameter (after putting in the Kaowool) is a lot smaller chamber than
> the 8" or so diameter in the more typical propane forges using the 3/4"
> pipe Bunsen burners (about 1/3 of the larger size).
> 
> 2.  Would the burner tip from a propane torch (e.g. Bernzomatic type) be
> adequate so I wouldn't need to build a burner?  I saw a small "bean can"
> forge set up this way, but it had only a 3" ID and6" length.  Going up to
> 4.5" ID with 7"+ L is a more than 260% increase in volume.  I'm thinking
> that may be a bit much for the propane torch to deal with.
> 
> I suppose I could make one using the torch tip and if it doesn't work just
> upgrade to a 1/2" pipe burner.  I just wanted to think out loud here and
> see what opinions or similar experiences might be floating around here.
> 
> Dave Brown
> Heritage Smithing
> Green Bay, WI
> ABANA, UMBA, GoM, MODA, ARG
> 
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