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Best material for a master to be investment cast

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Best material for a master to be investment cast [message #50798] Wed, 04 July 2012 14:02 UTC
avatar ShootingSight  is currently offline ShootingSight
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Registered: July 2012
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I am starting a project to make a steel investment cast part. About 2" x 1" x 0.5".

I'm thinking in the few hundred parts range, it will end up fitting in an assembly of mechanical parts in a machine, so here are my initial thoughts.

1. Shapeways makes a master.
2. I build a form and cast it in RTV silicone.
3. I got a little wax injection molder, so I shoot waxes
4. I send them off to a foundary to get cast in tool steel
5. I finish machine (reaming a pivot hole, and touching a surface grinder to clean up one edge).
6. Send out for heat treat.

So, my questions I can think of are:

1. What material is best for my master? Presumably I want the best surface finish, though I could clean it up by hand.
2. Shrinkage. I assume 4%, though I would not apply shrinkage to my pivot hole, so it is 4% undersized, leaving enough meat for the reamer to clean up.

What am I missing?

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