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Lab talk, the good, the bad, and the ugly
Metal
Looking for advice about casting fundamentals
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<blockquote data-quote="Affinity" data-source="post: 340944" data-attributes="member: 1246"><p>Dont let your resevoirs touch each other keep them separate. Take a second to visualize which way the arm spins and let the margins face the other direction, the mark on the mould is to orient it after its invested and you cant see where they are. Also that casting you showed, doesnt have enough gold, there is no button, you should have a decent amount of gold there, which is why there is porosity in the resevoirs, which is better than in the crown but still looks like it didnt have enough gold to cast dense. make sure you weigh your patterns with the sprue and resevoir then add 5-10%. (.5g wax x 14 density= .7g alloy +.07g= around 8g total for .5g wax weight)</p></blockquote><p></p>
[QUOTE="Affinity, post: 340944, member: 1246"] Dont let your resevoirs touch each other keep them separate. Take a second to visualize which way the arm spins and let the margins face the other direction, the mark on the mould is to orient it after its invested and you cant see where they are. Also that casting you showed, doesnt have enough gold, there is no button, you should have a decent amount of gold there, which is why there is porosity in the resevoirs, which is better than in the crown but still looks like it didnt have enough gold to cast dense. make sure you weigh your patterns with the sprue and resevoir then add 5-10%. (.5g wax x 14 density= .7g alloy +.07g= around 8g total for .5g wax weight) [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
Looking for advice about casting fundamentals
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