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Lab talk, the good, the bad, and the ugly
Metal
spruing FGC techniques
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<blockquote data-quote="user name" data-source="post: 97677" data-attributes="member: 1719"><p>Make sure you weigh your pattern and calculate! If you are having a button left over, it can draw alloy away from the reservoir during cooling. I burn out at 850c for 30 minutes then drop the temp to 950 before I cast. Dont over wind the machine. high gold on a centrifico I use 2 turns max. Make sure your used gold is CLEAN. Keep the reservoir in the middle of the ring. Clean out the tip of your torch and have it properly adjusted. It doesnt take much heat...dont get the gasses in the flame on the alloy and dont over heat it. Hot metal expands alot...and shrinks alot too.</p></blockquote><p></p>
[QUOTE="user name, post: 97677, member: 1719"] Make sure you weigh your pattern and calculate! If you are having a button left over, it can draw alloy away from the reservoir during cooling. I burn out at 850c for 30 minutes then drop the temp to 950 before I cast. Dont over wind the machine. high gold on a centrifico I use 2 turns max. Make sure your used gold is CLEAN. Keep the reservoir in the middle of the ring. Clean out the tip of your torch and have it properly adjusted. It doesnt take much heat...dont get the gasses in the flame on the alloy and dont over heat it. Hot metal expands alot...and shrinks alot too. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
spruing FGC techniques
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