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F.C. Gold Casting
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<blockquote data-quote="charles007" data-source="post: 21197" data-attributes="member: 9"><p>I'm betting on hot heat.</p><p></p><p>What are the setting on your oxy/prop........bet its to hot. </p><p>Use the burnout temp thats on your alloy direction....... yours seems high. </p><p>Seems like I used 900 temp with beauty cast years ago with a room temp bowl of water.....yes I did !! for many years.......s m o o t h castings !</p><p>I now use 1200 temp with Microstar HS with Ivoclar Midi gold 50... 45 minutes and cast........</p><p>Use 2 winds even though this may not have any bearing..... less is better if you aren't seeing miscasts. I use 2.5 or 3 turns on type 3, and 4 turns on Noble ceramic... with the Kerr machine. </p><p>Don't burn out for hours and hours, may receive rough casting. 45 to 60 minutes is fine for one ring....</p><p></p><p>I use 8ga reservoir sprues on the thickest cusp, usually the lingual.....On really heavy-large molars, use two sprues...... I even use 6g reservoir sometimes. </p><p></p><p>Where you attach your sprue, flare out the sticky wax around your pattern. Years ago I would rarely see porosity and or small pits near the sprue and or other places, this solved the problem! </p><p></p><p>Charles</p></blockquote><p></p>
[QUOTE="charles007, post: 21197, member: 9"] I'm betting on hot heat. What are the setting on your oxy/prop........bet its to hot. Use the burnout temp thats on your alloy direction....... yours seems high. Seems like I used 900 temp with beauty cast years ago with a room temp bowl of water.....yes I did !! for many years.......s m o o t h castings ! I now use 1200 temp with Microstar HS with Ivoclar Midi gold 50... 45 minutes and cast........ Use 2 winds even though this may not have any bearing..... less is better if you aren't seeing miscasts. I use 2.5 or 3 turns on type 3, and 4 turns on Noble ceramic... with the Kerr machine. Don't burn out for hours and hours, may receive rough casting. 45 to 60 minutes is fine for one ring.... I use 8ga reservoir sprues on the thickest cusp, usually the lingual.....On really heavy-large molars, use two sprues...... I even use 6g reservoir sometimes. Where you attach your sprue, flare out the sticky wax around your pattern. Years ago I would rarely see porosity and or small pits near the sprue and or other places, this solved the problem! Charles [/QUOTE]
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