I'm new to the forum, and retired so I'm not real adept at forums.
I hope my questions aren't too elementary but I can't seem to find the answers.
I've made a burner (mini-mongo style) which burns with a good blue flame and is pretty stable. I was going to build a furnace but tried a brick furnace first and even with gaps works well to melt aluminum.
I've been melting aluminum cans and casting muffin ingots. My first sand casting was a cylinder 1-1/4"x6" and I thought it turned out well
I was using talcum powder for parting. My second casting I used baking flour (I thought I read wheat flour was good but didn't know if that was Gold Bond Self Rising!) My second one burned the sand. Flour? Too hot? A problem? Did I damage the sand?
It machined fine, but has very small (0.020") air bubbles. I measured the density to be about 95% of 6061 density.
Thnaks in advance for any help I can get!