[TheForge] Venturi burner tubes

[Dave Brown]

I've just uploaded a picture to the Tools and Tooling album at the=20
http://www.photoaccess.com site.

It's a picture of three venturi burner tubes that I saved from the salvage=
=20
yard.  Measurements are noted in the picture file.  They are a bit small=20
for use in a large forge, and even for a freon tank forge you'd probably=20
need at least two.  But, for a small bean can (actually mine is an electric=
=20
motor housing) forge one should be more than sufficient.  These tubes have=
=20
a 1/2" inside diameter at the throat.  While they may seem short, the rule=
=20
of thumb that says the length of the mixing tube should be about 8 or 9=20
times the smallest diameter makes these tubes just about right.

Because they are cast the taper is already built in, which eliminates the=20
need to flare the end of a pipe burner.

These are small versions of the large commercial burner tubes that Ralph=20
Sproul mentioned using a little while back.

Because of the smaller venturi throat I think I'll have to use a smaller=20
orifice than the typical #58 drill size orifice (0.042").  A MIG contact=20
tip for .023 wire typically has a =B1 .030" ID and I'm thinking that this=20
could be just about right ... I hope.  I'll find out soon.

Anyway, I just thought this would be of interest to you scarp scroungers=20
and those interested in building themselves a small bean can sized=20
forge.  (my motor housing has a 6.375" diameter before putting the 1"=20
Kaowool blanket in and the cast refractory floor)

Since we have "pipe forges" and "freon can forges" and "bean can" forges,=20
will this make my forge an "electric motor gas forge"?  <smile>

Enjoy the photo.  If nothing else, it's food for thought.


Dave Brown
Heritage Smithing
Green Bay, WI
ABANA, UMBA, GoM, MODA, ARG

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