Question: A gray cast iron surface 6 in. wide and 18 in. long may be machined on either a vertical milling machine, using an 8 in.-diameter

A gray cast iron surface 6 in. wide and 18 in. long may be machined on either a vertical milling machine, using an 8 in.-diameter face mill having 10 inserted HSS teeth, or on a hydraulic shaper with a HSS tool. If milling is used, the feet per tooth is 0.01 in. For shaping, a feed of 0.015 in. per stroke would be used. Setup time for the milling machine would be 60 min and for the shaper would be 10 min. The lot size is 10 parts. The time required to load and unload either machine is 2 min. Machine-hour charges for the milling machine and shaper would be $24.50 and $16.50, respectively. Labor cost would be $8.75 per hour in each case. Which machine would be more economical for this job?

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