Hello All, I am looking for some advise on what I might be doing wrong when attempting to melt copper/brass/bronze. I have a Pyramid Products No. 10 furnace which will fit up to a number 6 or 8 crucible. It uses a propane burner with blower. These furnaces were sold out of the back of magazines in the 80's. The previous owner of my furnace used it to cast brass/bronze bells and cleats for boats so I know it can melt these materials (I saw some of his castings when I purchased the foundry.) However I can not seem to get the thing to melt anything more than aluminum efficiently. This evening I ran the furnace for over an hour with coils of copper wire (clean scrap of ebay) and they only got orange and kind of melted. I am thinking my air/fuel mixture is off? How do I know where to set the "air intake" door on the blower? Should I be seeing a few inches of flame shoot out of the exhaust hole in the lid? Any advise is appreciated as I am getting frustrated and almost ready to just stick with pattern making and pay a foundry to cast parts for me!