The Shop > Metal Stuff

Sawed off cupola

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vtsteam:
Ready to fire. It was getting cold, toward evening with snow threatening.

vtsteam:
A wood fire was gradually built up.

vtsteam:
After the wood had burned down, a layer of charcoal briquettes was poured in. When lit successive layers were added until the furnace was filled. It was left to heat soak for 30 minutes, and then blast air was applied to the tapping hole to bring the furnace up to temperature. Charcoal briquettes were added to keep it topped up over the next 3 hours of firing. It was dark and beginning to snow when I finally cut the air and bricked off the hole in the cover and the inlet.

vtsteam:
The next morning the furnace was sitting in a melted area after the snow. I walked over to feel the exterior to see if the outer shell was still warm. Yeooowwch, I jerked my hand away!  :wack:   :loco:   It was really hot 11 hours after it had been shut down, in subfreezing temperatures.

vtsteam:
It was cool enough to open by evening. Here's what the fired lining looked like. Not bad, only one real crack through the lining at the top of the furnace.

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