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- In Option A the holes are produced in the tabs by a two step
machining process -- rough machine and finish ream.
- A comparative cost analysis showed that for this component at
a production rate of 250,000/year, the rough machining operation for the four holes was
less expensive than the cost of making and placing the sand cores in the mold.
- The two step machining procedure is more economical for this
application and production rate, compared to the alternative method of making and
aligning/positioning multiple cores to produce the rough holes in the castings.
Option A is the
right design choice. Go on to the next design issue |
