Hello all. I'm hoping someone on here an help me. I work part time in a machine shop and today I was melting some bronze to make a new bearing for a large surface grinder we have. I have been using my home made propane furnace for a couple years now. The problem is figuring out how much raw material one needs to cast a blank for the new bearing. The old bearing weighs 17 pounds so I assumed I would need at least 20 pounds of raw bronze melted to make this blank. Wrong! I ended up with a little more than half of what was needed for the part. I haven't taken the part out of the mold yet so I don't know exactly how much the blank does weigh. It doesn't really matter because the molten bronze only filled the mold up half way to the top. This is a open top mold. It is a cylinder mold 4" in dia. and 10" high with a 1-1/2 pipe in the center to create the starting point of the bore of the bearing. I hope this makes sense. Question is how much raw material do I need to cast a cylinder 4" in dia and 10" long with a 1-1/2" hole thru the center? Thank you, Jim in Pa.