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Lab talk, the good, the bad, and the ugly
Metal
Holes , small pontic holes , caves into the pontics orinto thick metal supports imake
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<blockquote data-quote="lcmlabforum" data-source="post: 115228" data-attributes="member: 3238"><p>There is porosity issues - there is a diagram of a cross section of an investment with a diagonal cross-hair marking the center</p><p>of the ring when you look at it from the sides. The hottest part has to be where the sprue/reservoir area so that it continues</p><p>to stay molten and feed the pattern as the latter chill. However, still would not explain the extra 'bars' of casting - it seems</p><p>like there is some major turbulence possibly from a part of the investment that had the porosity, then broke off leading to </p><p>insufficient alloy to fee the pattern itself.</p><p>Good luck, but should not repeat itself all the time, might be just a single episode/fluke.</p><p>LCM</p></blockquote><p></p>
[QUOTE="lcmlabforum, post: 115228, member: 3238"] There is porosity issues - there is a diagram of a cross section of an investment with a diagonal cross-hair marking the center of the ring when you look at it from the sides. The hottest part has to be where the sprue/reservoir area so that it continues to stay molten and feed the pattern as the latter chill. However, still would not explain the extra 'bars' of casting - it seems like there is some major turbulence possibly from a part of the investment that had the porosity, then broke off leading to insufficient alloy to fee the pattern itself. Good luck, but should not repeat itself all the time, might be just a single episode/fluke. LCM [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
Holes , small pontic holes , caves into the pontics orinto thick metal supports imake
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