Quote Originally Posted by ESjaavik
No. You can recycle old castings. Don't user other aluminum. Don't let melted aluminum come in contact with iron! (So a steel melting pot is no good). To get good fluidity and avoid porosity use degassing briquets. Not Tetrachlorethane, the ones used now are much less harmful.

Don't let aluminum "stew" in the furnace. Melt, degas, skim and pour as soon as you get up to casting temperature.

Old automobile heads and pistons are fine. Try not to mix them, the outcome is unknown if you mix different aluminums.

I get you about not mixing the aluminum with other metals. I only machine aluminum t6 6061. What material can I mix it in?

Also do you know where I can just buy one? Where does the business that are already doing this for a living getting their machines from? I am just curious