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Lab talk, the good, the bad, and the ugly
Metal
centrifuge casting and torch
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<blockquote data-quote="disturbed" data-source="post: 44370" data-attributes="member: 4763"><p>keeping it in the fridge won't help with what al is talking about. It's the humidity levels in the air that change in the spring and fall. Putting your liquid in the fridge only extends the life of your liquid, doesn't really do very much for controlling expansion. If you see a shift in the way your metal fits over the next few months don't blame the invest.. blame the change in weather, <u>note the ratio you were using in the summer</u> cause you will have to go back to it next year, slightly adjust if you have problems and you should be good till spring.</p><p></p><p>I had to do this in the higher altitude areas but at sea level and closer to the equator I find it is no longer ness, because the weather does not change much, from winter to summer, where I am now. </p><p></p><p>always heat the crucible before you add the metal.. If you have a heavy carbon buildup in your crucible make sure you change it out for a fresh one. Keep your copings out of the heat zone.(towards the outer edge of the ring) these are basics but I have seen some people not doing these simple steps and having porosity issues....</p><p></p><p>good luck!</p></blockquote><p></p>
[QUOTE="disturbed, post: 44370, member: 4763"] keeping it in the fridge won't help with what al is talking about. It's the humidity levels in the air that change in the spring and fall. Putting your liquid in the fridge only extends the life of your liquid, doesn't really do very much for controlling expansion. If you see a shift in the way your metal fits over the next few months don't blame the invest.. blame the change in weather, [U]note the ratio you were using in the summer[/U] cause you will have to go back to it next year, slightly adjust if you have problems and you should be good till spring. I had to do this in the higher altitude areas but at sea level and closer to the equator I find it is no longer ness, because the weather does not change much, from winter to summer, where I am now. always heat the crucible before you add the metal.. If you have a heavy carbon buildup in your crucible make sure you change it out for a fresh one. Keep your copings out of the heat zone.(towards the outer edge of the ring) these are basics but I have seen some people not doing these simple steps and having porosity issues.... good luck! [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
centrifuge casting and torch
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