I made a small furnace for heat treating steel, although it should also be hot enough to cast aluminium and brass. The basic design is from a YouTube video by a schoolboy, and is the neatest small design I have seen on the web, although the basic principle could easily be modified to give different configurations – in particular it would be easy to make a front access furnace, or one that would take a longer part using the more of same bricks and elements etc. with a different configuration and a modified steel cage round it. Having used the furnaces a few times I think I skimped by only having half thickness bricks on the base as it gets pretty hot underneath – although as its standing on legs above a piece of stone it doesn’t really matter. The basic parts of the furnaces were sourced from Ebay and I spent around £80 or 90 making it, but I did have quite a bit of old junk lying about that got incorporated, including the metal for making the framework, the wiring bits for the circuit and the old plastic box and aluminium panels.
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