1. A cutting-off operation is being performed with a laser beam. The work piece being cut is 12 mm..

1. A
cutting-off operation is being performed with a laser beam. The work piece
being cut is 12 mm thick and 380 mm long. If the kerf is 2.4 mm wide, estimate
the time required to perform this operation.

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2. If the
operation in Problem 27.27 were performed on an electrical-discharge machine,
what would be the estimated machining time?