Hello Eddie,

I find this very interesting as I am working on something very similar. Looking at you CAD snapshot you will run into a few problems. To cast this you first need a wax pattern. This would be a complicated tool with possible undercuts. The tool would not only have to split, but also rotate all while not damaging the pattern. Also, depending on the diameter of the internal blades, you may run into problems with the ceramic dipping process. You would more than likely have to close the center hole for gating purposes. One way out of this is to create each pattern as a prototype created by either sterolithography or in ABS plastic with Fused Deposition Modeling (I have one of these machines). There is another prototyping machine that makes very accurate wax patterns, but it is painfully slow. A casting house may be able to create these from a prototype pattern, but will charge you an arm and a leg and won’t take responsibility if all the patterns fall out (guess how I know that). Also many casting houses are hesitant to work with prototype patterns, as the thermal expansion is much greater than wax and could possibly crack a shell. If the shell cracks, you can lose all your patterns in one shot.

It’s a nice design and I see exactly what you are trying to accomplish. Right now I say no it’s not possible, but you need to work closely with a casting house to brainstorm on what may work. If I get any ideas, I will send them your way. Good luck!

-Eric