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Lab talk, the good, the bad, and the ugly
Metal
Rocking, Rocking, ROCKING!
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<blockquote data-quote="digidental" data-source="post: 64188" data-attributes="member: 7085"><p>I know this post has been around for a while but just thought I would add my opinion anyway.</p><p>This is how I sprue large units, the idea is not to have a button, for 2 reasons first I want my bridge to cool first, a button will slow down the cooling on the other end and if the feeder sprues are not joined to the button it minimises the chance of distortion</p><p></p><p>[ATTACH=full]10361[/ATTACH]</p><p></p><p>If you do introduce stresses into your bridge after investing try running it through the furnace with a slow cooling cycle just a little hotter than a degasing cycle, the important thing is to make sure the temperature is well above any temperature that it will go to during porcelain firing, this can sometimes work in releasing any stresses in the bridge, I am a one man lab and it is a lot easier to control things, but in my time in a bigger lab this is one technique I had to use to help others I use to do it with a casting torch but that takes a little practice, it helps if you understand the material you are working with, its ok to cut corners as long as you are aware of what effect you are having, but in a bigger lab I found it was usually the corners someone else was cutting that was the cause of the problem</p><p>[ATTACH=full]10361[/ATTACH]</p></blockquote><p></p>
[QUOTE="digidental, post: 64188, member: 7085"] I know this post has been around for a while but just thought I would add my opinion anyway. This is how I sprue large units, the idea is not to have a button, for 2 reasons first I want my bridge to cool first, a button will slow down the cooling on the other end and if the feeder sprues are not joined to the button it minimises the chance of distortion [attach=full]10361[/attach] If you do introduce stresses into your bridge after investing try running it through the furnace with a slow cooling cycle just a little hotter than a degasing cycle, the important thing is to make sure the temperature is well above any temperature that it will go to during porcelain firing, this can sometimes work in releasing any stresses in the bridge, I am a one man lab and it is a lot easier to control things, but in my time in a bigger lab this is one technique I had to use to help others I use to do it with a casting torch but that takes a little practice, it helps if you understand the material you are working with, its ok to cut corners as long as you are aware of what effect you are having, but in a bigger lab I found it was usually the corners someone else was cutting that was the cause of the problem [ATTACH=full]10361[/ATTACH] [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
Rocking, Rocking, ROCKING!
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