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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="kimba" data-source="post: 340826" data-attributes="member: 9600"><p>I would suggest weighing your patterns and sprues, This way you will know exactly how much alloy you will need to not end up with the huge button which as has been stated here , leads to porosity. It can also cause distortion of bridges as well as COCCr frame works if the multiple sprues are joined up..</p><p> just multply the weight of your pattern and sprue by the density of your alloy , and that gives the exact weight of alloy needed to cast.</p><p> </p><p> also for full gold crowns , I lower the number of winds of my casting arm. For mine I use 3 for bonding alloyx , but 2.5 for casting alloys. This reduces turbulance in the melt. ( I think I learnt hat from this site) You will have to play around with your particular cating arm.</p><p> </p><p>And Be Scientific . Dont change everything at once. Keep constants and variablesandtry and keeps notes , which I know is hard when busy in the lab.</p><p> search this site as there has been some good discussions on casting .</p><p> </p><p>Good luck!!!!! the fact that you are on this site and reaching out makes you half way there. Even if you are a pinko commi Vaxcine Cuck <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="kimba, post: 340826, member: 9600"] I would suggest weighing your patterns and sprues, This way you will know exactly how much alloy you will need to not end up with the huge button which as has been stated here , leads to porosity. It can also cause distortion of bridges as well as COCCr frame works if the multiple sprues are joined up.. just multply the weight of your pattern and sprue by the density of your alloy , and that gives the exact weight of alloy needed to cast. also for full gold crowns , I lower the number of winds of my casting arm. For mine I use 3 for bonding alloyx , but 2.5 for casting alloys. This reduces turbulance in the melt. ( I think I learnt hat from this site) You will have to play around with your particular cating arm. And Be Scientific . Dont change everything at once. Keep constants and variablesandtry and keeps notes , which I know is hard when busy in the lab. search this site as there has been some good discussions on casting . Good luck!!!!! the fact that you are on this site and reaching out makes you half way there. Even if you are a pinko commi Vaxcine Cuck ;) [/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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