How to make negative mold for object?

[andrewneil01]

I need to cast a pewter object in my schools pewter casting machine but I do not know how to make negative molds for objects need help? How do you make a negative mold around the object in the autodesk inventor program?

I want to make a mold similar to the one on the right.

I made the coin but I don`t know how to make the mold for it.

[Chris.Palmatier]

I know you'll need to model your coin, but I'm not sure beyond that. You'll get more answers in the Inventor group, this group is for Inventor Automation Professional/Intent.