Im using charcoal now, starting to dislike the coal, too hard to get the temp right. I did a couple casts of alum today and they were all way too cold. My refractory is clay, sand, cement and perlite. Its cracking but holding up pretty well.
What kind of casting sand are you using? You should get some oil bonded sand, there is no moisture in it to boil and throw liquid metal into the air.
I am trying to get with anouther forum member to have my block "printed" out using a 3d prototype machine. Then I can do some casts.
so how did you end up going about degassing the copper?
Looks good, cant wait till I get mine made up.
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