Quote:
Originally Posted by Zerohour
What kind of setup do you have at the school? Do you have a small brick open? Open top furnace? I would assume you have gas being a school teacher and not a back yard master of trade :-)
-What type of crucibles do you use?
-Do you have re-line the furnace on an set intervals?
-Is it under service contract?
-With LFC, what type of sand do you pack around the foam mold? They did this in my high school, but I believe it was just some type of green sand.
-Where do you get the metal supply? Ingots?
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We have a natural gas closed top furnace. Graphite crucible (and we have one for steel, i think). I have not had to reline the furnace (dont know if it has ever been done, but it is in good shape). No service contract. Silica sand. We have a large supply of ingots that I dont know the origins of, but I typically do some recycling. I use pistons, cylinder heads, flywheels, snowmobile clutches, etc. The only problem is the silica content in silicon and it seems to just form a slag on the top of the flask. It gets scooped out, of course, and I am not sure how that effects strength.