|Contact||[[Project Contact::Semafoor, Gori]]|
To make a foundry capable of melting reasonably large amounts of metal, more specifically aluminium, brass and bronze. In my wildest dreams also cast iron, but that may not be realistic
Gori made a small foundry out of a soup can, a propane blowtorch and some refractory. This works reasonably well and never fails to gather a crowd. It only melts approximately 0.2 l of aluminium, and this is clearly not enough to do any real work.
Semafoor is gathering materials to build a second, much larger furnace out of a 60 l oil drum. Should look something like this >.
Key points are:
- Movable on its own wheels because it will be heavy
- A lid to reduce the heat loss at the top (big problem in the soup can furnace
- Incorporated device to lift the lid up and to swing it to the side
- Lid will be mounted on a tube that will slide into a larger tube of the frame
- Lever + Cam to lift the lid a couple of cm, to be clear of the bottom part of the furnace
- Same lever will be used to swing the lid sideways
- about 5 cm of refractory all around. Probably a bit more on the lid for rigidity
- Electric blower to provide more air for combustion > more fuel > more heat
- Fuel: Not sure yet. Possiblities are:
- Coal: Low initial investment. Needs a specific design to get the air at the right places. Dirty operation
- Propane: moderate initial investment. Relatively expensive to run. Easy to run. Cleanest fuel.
- Waste oil: Motor oil or vegetable oil. (nearly) free to run. easy to run, quite clean when running. Vegetable oil would be CO2-neutral as well. Most hackable fuel (dedicated fuel system and all)