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How do I make Precision Resin Molds?
I asked a question before about making compressor/turbine blades for a mini jet engine and this awesome dude gave me the idea to use a carbon-epoxy mix. How would I make a precision mold to make the blades, and, if you know, would such a resin be able to withstand the heat of the engine (if figure that since it's a small engine (like 1" intake), the heat will dissipate quickly.
Use solid modeling to produce a model of the turbine blade. Make a two-part mold from the model using a high durometer urethane casting. Use the two-part mold to produce the blades.
Without knowing the thermal duty cycle in such an engine, the heat resistance of an epoxy/carbon part is a guess. If the properties are not sufficient, then the properties may be enhanced by several methods, including addition of carbon nanotubes to the epoxy or thermal conversion of the epoxy to carbon, similar to what is done for the leading edge of the Space Shuttle wings.
How to make silicone candy molds, cheap!