What alloy are you casting and what percentage is fresh
14 or 18 karat gold anywhere from 50% to 100% fresh grain
Are you Vac or Centrifugaly casting?
Are you torch melting and with what kind of fuel?
Yes a torch and I use acetelene and oxy.for casting
What is your flask temp at cast?
I use the recommended cast temps per Murry Bovin’s book"Jewelery
Casting" yellow gold thick=800-850 deg. thin 900-1000 deg.
white gold thick 900-1000 deg. thin 1050-1150 deg. I always cast
my white items first
#5 Is your crucible new or has it been cleaned?
The crucible is not new.
What does the metal look like just before cast?
mirror, and I am keeping the bushy flame covering the melt so as
not to let it absorbe oxygen,Thanks to advise from this forum.
Does it make a difference if you let it cool a few minutes
I don’t know,I have always quenched within 5 minutes because
that is the way I was taught.The problem with waiting to long is
that the investment stays stuck in the flask.
thanks for your reply,
michael mathews Victoria,Texas USA