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My Hair Brain Idea...Need Opinions
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<blockquote data-quote="charles007" data-source="post: 32208" data-attributes="member: 9"><p>Accutech... follow these rules very carefully for thin casting :</p><p></p><p>Wax .3 no less on your first case with buildup where needed. Add your M&D wings for support.</p><p>Blackout all undercuts and sharp edges.. very important for good fits</p><p>8g sprue. </p><p>Place crowns near the outside wall, out of the thermal zone- heat zone,</p><p>Pour investment 1/4 above the patterns, NO MORE all patterns about the same height !</p><p>Burn out at 16 or 1700 ,depends on investment , one hr, 10 minutes extra per addition ring.</p><p>Preheat crucible for 10 minutes, or place in oven from beginning. preheat ingots if you want to... this step is very important !</p><p>35 to 40 LB OXY. using Tilite </p><p>Preheat the crucible again with torch for a few seconds. place ingots close together. I used to preheat crucible and ingots at the same time. </p><p>Heat the alloy and keep moving your torch back and forth ! very important ! When you see it slump, take ring out immediately, and cast quickly !</p><p>Use 1 to 1.5 extra turns on casting machine.. 1 to 1.5 extra turns than noble ceramic alloys.</p><p>Push off the casting arm so it takes off gently. </p><p>It should take you about 30 seconds to heat the metal, take ring out and release arm... In other words, approx 20 seconds to heat NP using a multi-orifice tip, and preheat crucible, depending on the amount of ingots. </p><p>KEEP MOVING YOUR TORCH SO ALL INGOTS ARE HEATED.</p><p>Good Luck</p></blockquote><p></p>
[QUOTE="charles007, post: 32208, member: 9"] Accutech... follow these rules very carefully for thin casting : Wax .3 no less on your first case with buildup where needed. Add your M&D wings for support. Blackout all undercuts and sharp edges.. very important for good fits 8g sprue. Place crowns near the outside wall, out of the thermal zone- heat zone, Pour investment 1/4 above the patterns, NO MORE all patterns about the same height ! Burn out at 16 or 1700 ,depends on investment , one hr, 10 minutes extra per addition ring. Preheat crucible for 10 minutes, or place in oven from beginning. preheat ingots if you want to... this step is very important ! 35 to 40 LB OXY. using Tilite Preheat the crucible again with torch for a few seconds. place ingots close together. I used to preheat crucible and ingots at the same time. Heat the alloy and keep moving your torch back and forth ! very important ! When you see it slump, take ring out immediately, and cast quickly ! Use 1 to 1.5 extra turns on casting machine.. 1 to 1.5 extra turns than noble ceramic alloys. Push off the casting arm so it takes off gently. It should take you about 30 seconds to heat the metal, take ring out and release arm... In other words, approx 20 seconds to heat NP using a multi-orifice tip, and preheat crucible, depending on the amount of ingots. KEEP MOVING YOUR TORCH SO ALL INGOTS ARE HEATED. Good Luck [/QUOTE]
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