An Example in Ductile Iron Casting The
Universal Joint Coupler
Near-Net
Shape and Machining Costs
The universal joint requires through-holes on each of the four tabs. The
holes are 1.075” in diameter and have to be machined for precision fit.
The casting engineer has two options in
producing these holes.
Option A -- Produce the holes in a 2-step machining operation - rough
drill and finish ream.
Option B -- Produce the holes with a rough diameter using two sand
cores in the mold. The sand cores are removed from the casting and the holes are finish
reamed.
Two
options are shown with different positions for the in-gate. Which option would
you choose (Option A or Option B)?
