The Shop > Metal Stuff
Sawed off cupola
vtsteam:
And silver brazed together:
vtsteam:
Here are various mods. The .024" Mig tip has been re-shaped to a bullet outer profile, and the threads at the base turned off to fit inside a 1/4" copper tube. This will be silver brazed in. It will create a compressed air jet to blow oil out through the plug orifice -- something like an injector.
The modded brass plug orifice has been countersunk 60 degrees on the inside, and has a 3/32" hole for exit of the oil and air mix.
Also shown is the 1/4" iron pipe extension that has been brazed to the Tee and threaded internally to take the orifice plug.
vtsteam:
Here's the completed assembly. The compressed air comes in on the left line. It travels through the coaxial 1/4" copper line and mig tip. The oil comes in on the right line. It fills the 1/4" iron pipe section. The gap between the mig tip and brass plug pipe orifice is adjustable by screwing the plug in. The compressed air @ 30 psi forces the oil in the gap through the orifice and atomizes it.
Not shown is the outer 1-1/4 tube housing that is inserted into the furnace and forms the duct for the blower.
I hope this new burner will outperform the old one with a full spray, and eliminate the drip.
ironman:
It is great to see you melting cast iron. You have joined a very exclusive club!
Does this mean that the cupola iron melting idea is gone forever? :bow: :bow: :bow: :clap: :clap: :clap:
vtsteam:
--- Quote from: ironman on July 02, 2013, 08:42:18 PM ---It is great to see you melting cast iron. You have joined a very exclusive club!
Does this mean that the cupola iron melting idea is gone forever? :bow: :bow: :bow: :clap: :clap: :clap:
--- End quote ---
No Ironman, I almost made up the 10" cupola furnace extension today, but decided to upgrade the oil burner instead because it was, again, RAINING. And I didn't want to weld in the rain.
I have never seen a wetter late spring and early summer. It rained right after my first iron pour, and has rained every day since and is predicted to rain through the end of the week. Two year ago we had a drought and were without water for two months. I'm not complaining but.......crikey!
I'm also going to reduce the size of the tuyere to fit the oil burner but add a second one opposite for use when a cupola -- two tuyeres will help prevent the slope of the charcoal that the iron slid down prematurely to tuyere level on my first try -- and the doubling of the bed height should help, too.
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