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Lab talk, the good, the bad, and the ugly
Metal
High Noble Gold Porosity.
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<blockquote data-quote="sixonice" data-source="post: 9123" data-attributes="member: 2"><p>Looking at your pictures, the button looks enormous. Do you weigh your wax-up's (with sprues) and multiply that number (in grams) by the specific gravity of your alloy? The large button is pulling heat away from your reservoir sprues. Using that formula will ensure you cast just the right amount of alloy and end up with a very thin button (thinner than the reservoirs on the sprues). You want the reservoirs to cool last and have any porosity on the underside of them.</p></blockquote><p></p>
[QUOTE="sixonice, post: 9123, member: 2"] Looking at your pictures, the button looks enormous. Do you weigh your wax-up's (with sprues) and multiply that number (in grams) by the specific gravity of your alloy? The large button is pulling heat away from your reservoir sprues. Using that formula will ensure you cast just the right amount of alloy and end up with a very thin button (thinner than the reservoirs on the sprues). You want the reservoirs to cool last and have any porosity on the underside of them. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
High Noble Gold Porosity.
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