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Lab talk, the good, the bad, and the ugly
Metal
Spruing help
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<blockquote data-quote="Al." data-source="post: 64809" data-attributes="member: 382"><p>Hi Cumino,</p><p>Mabey a few things.</p><p>Pd based metals are lighter and need a hotter flame and don't flow as well as high gold content.</p><p>Lighter so make sure you have enough metal to push it in the mold.</p><p>Gold tends to swirl when it's ready to sling, you have to go just a bit past that with higher pd content. I sling it when it first turns white. A little early and you may have holes late and you may burn it.</p><p>Also for pd based mtl I keep it .5 over all thinner spots and you may have holes ESP if they are on corners. </p><p>Also I thicken the margins more than gold or put a small band 360 and then thin it down in the esthetic zones.</p><p>The 40 % gold alloys I used were similar to the higher au content but the pd alloys are a bit different. The 40% au alloys still need to be cast hotter than higher au but not as hot as pd. I burn out everything at 1550 F. 4 turns on the casting arm.</p></blockquote><p></p>
[QUOTE="Al., post: 64809, member: 382"] Hi Cumino, Mabey a few things. Pd based metals are lighter and need a hotter flame and don't flow as well as high gold content. Lighter so make sure you have enough metal to push it in the mold. Gold tends to swirl when it's ready to sling, you have to go just a bit past that with higher pd content. I sling it when it first turns white. A little early and you may have holes late and you may burn it. Also for pd based mtl I keep it .5 over all thinner spots and you may have holes ESP if they are on corners. Also I thicken the margins more than gold or put a small band 360 and then thin it down in the esthetic zones. The 40 % gold alloys I used were similar to the higher au content but the pd alloys are a bit different. The 40% au alloys still need to be cast hotter than higher au but not as hot as pd. I burn out everything at 1550 F. 4 turns on the casting arm. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
Spruing help
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