Thanks Rob.
The tapping hole 's on the right side, low down, you can't see it from this angle. It doesn't have a spout yet. I had been using it as a tuyere when I melted aluminum as a crucible furnace.
The cupola tuyere is on the left where the elbow is -- it was formerly plugged. There is no wind belt on this small furnace.
Today I cut out the bottom of the furnace. I just used a stick to do that -- the stainless is very thin -- I measured .020 on the drop.
I started to make up a new bottom -- I don't have much for sheet steel, but found an old disk shape that was almost exactly the right size -- the OD was 17", perfect. But the hole was 6" dia. and I needed 7"
So I found a circle cutting attachment I made for my torch several years ago and took a strip of steel and tacked it across the hole to give me a center point. Then I punched the center.
![](http://www.vtsteam.com/SawedOffCupola/Cupolaconst8.jpg)