Coring versus Machining

• The bearing plate requires six holes in the six tabs used for mounting the hinge pins.
• The casting engineer has two options in producing these holes.

Option A -- Produce the six holes in a 2-step machining operation - rough (BLUE) and finish (RED) drilling operations.

Option B -- Produce the holes with a rough diameter using four sand cores in the mold. The sand cores are removed from the casting and the holes are finish drilled (RED).

Which option would you choose
(Option A or Option B)?

Grede Foundries, Inc.
Milwaukee Steel Division