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Lab talk, the good, the bad, and the ugly
Metal
Spruing help
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<blockquote data-quote="Al." data-source="post: 64823" data-attributes="member: 382"><p>I dont know about spruing. 40% is pretty forgiving. Mainly make sure you are using the trailing edge for putting your ring in, you know all margins facin the same direction and mark the on the former to place it in the furnace, and no sharp angles with the sprue meaniing I put the sprue mostly on the lingual and aim it towards the opposite B margin. </p><p></p><p>If your already doing that my guess is your not casting it hot enough or your wax is too thin in spots. For ucla abbutments I used to get incomplete castings at the margin area or base, all I did is make sure the wax was thick enough and havent had that problem since.</p><p>My casting temp for high pd 2% au alloy would be too hot for 40% au and my casting temp for 40% au is too hot for 80% au alloy. My casting temp for pd 2% au alloy would burn my 80% au alloy.</p></blockquote><p></p>
[QUOTE="Al., post: 64823, member: 382"] I dont know about spruing. 40% is pretty forgiving. Mainly make sure you are using the trailing edge for putting your ring in, you know all margins facin the same direction and mark the on the former to place it in the furnace, and no sharp angles with the sprue meaniing I put the sprue mostly on the lingual and aim it towards the opposite B margin. If your already doing that my guess is your not casting it hot enough or your wax is too thin in spots. For ucla abbutments I used to get incomplete castings at the margin area or base, all I did is make sure the wax was thick enough and havent had that problem since. My casting temp for high pd 2% au alloy would be too hot for 40% au and my casting temp for 40% au is too hot for 80% au alloy. My casting temp for pd 2% au alloy would burn my 80% au alloy. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
Spruing help
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