The Shop > Metal Stuff

Sawed off cupola

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vtsteam:
Rain held off. Started on the second tuyere. Decided to make both 2" dia and line with steel tube. So I cut two sections of tube with angled ends. They will both mount pointing downward towards the center of the barrel,

Here I'm drilling out the location for the second tuyere opposite the original one with a carbide masonry drill. It went right through the stainless steel jacket and easily drilled through the firebrick lining. Took about 5 minutes to do.

vtsteam:
And here is the tubing liner installed:

vtsteam:
And the new liner on the first tuyere. Black stain is soot from the oil burner drip. I had to chisel the firebrick a little on this side to be able to angle the tuyere downward. The upper hole is from a fitting removed from the original vacuum cleaner that forms the housing.

vtsteam:
And finally today I bent up and welded together a ten inch cupola extension.

To do: Line the extension, extend the top lift rod, make some sort of wind manifold -- not sure if it will be a full fledged wind belt or not.

The furnace as it stands now:

vtsteam:
Today I lined the cupola furnace extension. I was a little concerned about building it with firebrick on the table and then transporting it to the furnace. Not much wet strength compared to the weight, and I could imagine the whole thing collapsing out of the steel ring. But I couldn't dry it very easily without heating it on the furnace, so it did have to be moved.

Finally I decided to just build it right on top of the furnace. But to prevent sticking the wet clay to the furnace top, I put a layer of cardboard between them. I hoped the cardboard would burn out once fired.

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