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okI am ok with casting. I am not very far into lathe work. I would love to attempt the sphere but haven't done one yet. Was working on a flame box rolling pin when you answered. Have cast a few smaller items like flood coating a walnut countertop. Let me gather up some maple burl and try the sphere for my own entertainment and if I can satisfy myself on that we will see if you still got sponge left to play with.
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fully encased indie the resin would preclude need for any cutting of titanniumYou can cut titanium with carbide tooling, but doing it by hand on a wood lathe without coolant sounds painfully slow. I have used my carbide insert wood lathe tools to turn metal many times, but not taking a lot of material off. Plus the material properties between metal and hardened resin are so different that it could be tough to get a uniform surface and finish. Seems like a better job for a CNC lathe.