Option B -- Center Core and Machine

In Option B, the center bore in the hub is produced  as a near-net shape feature in the hub by placing a pin core in the mold.  

• A rapid finish ID machining operation on the casting gives the center bore the required taper and dimensional tolerance.

• The keyway on the bore is broached in a separate machining operation.

A comparative cost analysis showed that  the near-net shape casting and  the machining operation are less expensive than a  two-step machining process. 

Using a core, also reduces the mass of the cast hub and ensures the hub solidifies without solidification shrinkage.

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