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In short, I've considered my options (I can explain if you want), and I'm planning to make a vertical sword oven using a 100 lb propane tank as the shell. Video 1, Video 2, thread. I don't plan to make it electrically controlled. I want to get swords up to critical temperature for normalizing and the quench. If I can temper them too, that's a bonus. There are some things I want to ask about/confirm. This group suggests 2 inches of kaowool for forges. I assume the same goes for this oven. It would be nice to not have to worry about airborne fibers (I'll wear a respirator if there are), but it would be difficult to apply rigidizer or castable refractory the usual way because of the size. Because this is an oven, I don't think it needs castable refractory. I think I could only use rigidizer and be safe. I think the rigidizer doesn't harden the kaowool immediately, so I think I should be able to apply rigidizer to the pieces while they're flat, then bend them into the shell and let the rigidizer dry/cure. I've read that a gallon of rigidizer will make a hard surface (but not a hard hard interior) on 25 square feet. If I were to rigidize both layers completely, it would be a lot of rigidizer, and I don't know if that would be necessary for this application. My guess is that if I were to harden the surface of all the exposed kaowool, I would be safe from airborne fibers. If that won't work, how do I make it safe? As for ITC-100, it would be a lot, I don't think I could apply it because of the dimensions, and I don't think it's necessary for this application. I have problems with my coal forge, and have been wanting to switch to propane. I thought that while at it building the oven, I could finally build a propane forge from a 20 lb propane tank. I won't be using the forge and the oven at the same time, so I considered buying one high quality burner (rather than 2 cheap burners) and moving the burner (held in with thumb screws) between the forge and the oven as needed, and eventually getting another burner if I think it's worth it. I was thinking of getting a 3/4" t-rex burner for that.
Here is the start(midway)building of a Heat Treating / Burnout Oven(for lost wax casting wax burnouts) I'm building. 14" x 14" x 17-1/2" tall inside. This will have 4 heating elements. Grooves made with a standard wood router and a template. The temp will be controlled by a PID digital controller w/ ramping step option. More pictures to come.