Here is my first furnace. I made it using instructions from Lionel Oliver's book "The Flowerpot Crucible Furnace".
You can read more about it at his site at http://www.backyardmetalcasting.com/book_fp.html.
It is basically a flower pot inside of a popcorn tin. Regular concrete mix fills the space between.
I used a hair dryer to provide forced air and charcoal briquettes for the fuel.
It worked very well, melting a pot of aluminum in about 30 minutes.
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