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Old March 5, 2011, 08:42 PM   #6
Edward429451
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Join Date: November 12, 2000
Location: Colorado Springs, Colorado
Posts: 9,494
Quote:
drop anything from exactly on to .006 too large.
WW alloys wont vary that much IME. I think what you are experiancing is from lack of heat control. If you cast with temps all over the place you will get results like you describe. The melt gets hotter as it gets closer to the bottom, chunking sprues and rejects back into the pot and continuing to cast without letting the temps even out again will do it also.

You need a casting thermometer, or a K type thermocouple and a multi-meter to keep the melt +-10 deg and your boolits will be closer to Match grade.
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