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number1
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Good morning.
How do I adjust my investment ratio for better fitting long span bridges? I follow the wax/sprue techniques in some of the forums and use Fast Fire investment. 30 minute bench set with a 60 minute burnout at 1450. After casting, bench cool to touch. I find that the individual units fit ok, but the bridge as a whole does not. It seems to only happen on big bridges with multiple pontics. Simple 3 or 4 unit bridges are no big deal. Is there any merit to adjusting the ratio? And if so, which way?
Thanks
How do I adjust my investment ratio for better fitting long span bridges? I follow the wax/sprue techniques in some of the forums and use Fast Fire investment. 30 minute bench set with a 60 minute burnout at 1450. After casting, bench cool to touch. I find that the individual units fit ok, but the bridge as a whole does not. It seems to only happen on big bridges with multiple pontics. Simple 3 or 4 unit bridges are no big deal. Is there any merit to adjusting the ratio? And if so, which way?
Thanks