Re: Model brake component size comparison to prototype


steve_wintner
 

High quality castings for aircraft engines are usually "investment cast" which is pretty much lost wax by another name. A variety of materials can be used - wax, plastic, stereo lithography or other 3d printed resins. Burn them / melt them out, then pour - under vacuum for highest quality. The plasters used withstand very high heat, so high melting point plastic is irrelevant as long as it burns out leaving no ash behind.  All metals shrink when they solidify, but it's only a few percent. Depending on how it's done, the wax may shrink too. .97*.97 = still only a little bit. If you are making aircraft engines, that few percent matters. 

Aside from jewelry, model railroad gubbins, and aircraft engines, there are cheaper processes for most applications.

Steve


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