The Shop > Metal Stuff
Sawed off cupola
vtsteam:
A base layer of fire clay and sand was put down and the firebricks were pressed into ring.
The brick edges were buttered with premix refractory furnace cement -- the type with sodium silicate in it. I had a gallon of the stuff, and though it isn't refractory enough to handle iron melting temperatures, the outer edges of the furnace probably never have reached as much as 400 F.
But one great advantage of the furnace cement is that it is a very good adhesive compared to the clay/sand mix. So I was able to effectively glue the brick to the steel outer ring with a good bond, and I hoped this would help prevent any collapse of the extension lining when it is finally heat cured.
vtsteam:
Adding more firebrick. The spaces between the bricks were filled with clay sand mix and chunks of broken up firebrick. Each section was progressively filled and rammed.
vtsteam:
And finally the extension lining was completed with a cap of fireclay and sand.
After this photo, I loaded the cupola with wood and kept the fire burning for 4 hours. The draft through the 2 new 2" dia tuyeres was sufficient for a good draw without a blower. Toward the end of the burn, I covered the cupola with the lid. I haven't tried to remove the extension yet as it is very hot, but I think it baked well.
Rob.Wilson:
Hi Steve
You have been busy :thumbup: , nice job making the extension piece , looks like you will have room for allot more fuel .
Rob
vtsteam:
Thanks Rob! :beer: Your encouragement has kept me going on this thing. :nrocks:
Guess I've got to make more charcoal now.
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