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Fixed
the metal frame work change ?
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<blockquote data-quote="JohnWilson" data-source="post: 8121" data-attributes="member: 213"><p>This is a good explanation, </p><p></p><p>In simple terms Nobel metal predominately PD based have very little problems with distortion after casting even when finished to the margin less than .3</p><p></p><p>When you get into PD / Au metals most people look for an alloy that is silver free to eliminate the complication that silver can have on porc. Ag and PT add hardness to alloy that helps with the creeping. Another trick is to slow the cooling rate down from the porc oven to try and control distortion. The higher the gold content the slower we cool our bakes. </p><p></p><p>There are ways to harden you alloy pre cutting off the spru that I know many Labs use. Perhaps someone can elaborate on this technique if they use it in their lab.</p><p></p><p>We use 3 main Metal Ceramic alloys in my lab and use exclusively Vita Porc with great results with no creep following the above routines.</p><p></p><p>ARGELITE 71</p><p>ARGEDENT BIO 88</p><p>ARGEDENT EURO</p></blockquote><p></p>
[QUOTE="JohnWilson, post: 8121, member: 213"] This is a good explanation, In simple terms Nobel metal predominately PD based have very little problems with distortion after casting even when finished to the margin less than .3 When you get into PD / Au metals most people look for an alloy that is silver free to eliminate the complication that silver can have on porc. Ag and PT add hardness to alloy that helps with the creeping. Another trick is to slow the cooling rate down from the porc oven to try and control distortion. The higher the gold content the slower we cool our bakes. There are ways to harden you alloy pre cutting off the spru that I know many Labs use. Perhaps someone can elaborate on this technique if they use it in their lab. We use 3 main Metal Ceramic alloys in my lab and use exclusively Vita Porc with great results with no creep following the above routines. ARGELITE 71 ARGEDENT BIO 88 ARGEDENT EURO [/QUOTE]
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Fixed
the metal frame work change ?
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