Another update on the project:
I’ve been looking at the construction of the furnace itself.
While I’m still looking at using a 13 litre bucket as the base, I’m looking at something other than the usual mix of playground sand and Plaster-a-Paris. The best mixture I’ve found so far is the following:
- Portland Cement
- Silica Sand
This is a mix I got from Back Yard Metal Casting’s “2 Bucks” furnace design, and looks to be a much more resilient and insulating than the sand and plaster mix.
With the furnace itself, and the crucible sorted, the last thing is the heat itself, I’ve been looking at various methods involving propane, which should burn cleaner and more controllably than charcoal.
With the deadline looming I’m going to be aiming to finalise the bill of materials and getting some feedback on it, sourcing the materials and costing it up.