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Lab talk, the good, the bad, and the ugly
Metal
Porosity in bulky 60% gold implant, help.
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<blockquote data-quote="user name" data-source="post: 322785" data-attributes="member: 1719"><p>Id use a reservoir equal in mass to the crown, locate the res at the heat center of the ring.</p><p>Angle crown with margins to the trailing edge as the casting machine spins.</p><p>I burn out at 850, then let it cool to 540 before casting (centigrade). Looking inside the ring it should just still have an orange glow, but not bright.</p><p>Smooth edges on all wax connections to avoid turbulence.</p><p>Dont over heat the alloy.</p><p>Make sure alloy is CLEAN! When its just about ready to cast, sprinkle some borax on it to pull any slag so clean metal enters the ring first.</p><p>Minimum force on casting. Broken arm machine, no more than 1.5 turns.</p><p>As [USER=660]@CatamountRob[/USER] said...use the correct amount of alloy. You want the res feeding the crown, not being drawn back by the button.</p><p></p><p> [USER=8469]@JMN[/USER] and I were discussing earlier this weekend...I gave up all metal work. If forced, Id send designs to be milled in metal.</p></blockquote><p></p>
[QUOTE="user name, post: 322785, member: 1719"] Id use a reservoir equal in mass to the crown, locate the res at the heat center of the ring. Angle crown with margins to the trailing edge as the casting machine spins. I burn out at 850, then let it cool to 540 before casting (centigrade). Looking inside the ring it should just still have an orange glow, but not bright. Smooth edges on all wax connections to avoid turbulence. Dont over heat the alloy. Make sure alloy is CLEAN! When its just about ready to cast, sprinkle some borax on it to pull any slag so clean metal enters the ring first. Minimum force on casting. Broken arm machine, no more than 1.5 turns. As [USER=660]@CatamountRob[/USER] said...use the correct amount of alloy. You want the res feeding the crown, not being drawn back by the button. [USER=8469]@JMN[/USER] and I were discussing earlier this weekend...I gave up all metal work. If forced, Id send designs to be milled in metal. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
Porosity in bulky 60% gold implant, help.
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