Design the part so that the shape is cast easily.
Select a casting process and material suitable for the part, size, mechanical
properties, etc.
Locate the parting line of the mold in the part.
Locate and design the gates to allow uniform feeding of the mold cavity with molten
metal.
Select an appropriate runner geometry for the system.
Locate mold features such as sprue, screens and risers, as appropriate.
Make sure proper controls and good practices are in place.