Core Option A

Option A -- Two Step Machining

In Option A the holes are produced in the tabs by a two step machining process -- rough drill (Blue) and finish drill (Red).

A comparative cost analysis showed that for this component and the required production rate, the rough drill operation for the six holes was less expensive than the cost of making and placing the sand cores in the mold.

The two step drilling procedure is more economical for this design and production rate, compared to the alternative method of making and aligning/positioning multiple cores to produce the rough holes in the castings and then doing finish drilling
Option A is the right design choice.

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An Example in Steel Casting Hinge/Bearing Assembly for Log Forwarder