Question: A hole 89 mm in diameter is to be drilled and bored through a piece of 1340 steel that is 200-mm long, using a horizontal

A hole 89 mm in diameter is to be drilled and bored through a piece of 1340 steel that is 200-mm long, using a horizontal boring, drilling, and milling machine. High-speed tools will be used. The job will be done by center drilling, drilling with an 18-mm drill, followed by a 76-mm drill, then bored to size in one cut, using a feed of 0.50 mm/rev. Drilling feeds will be 0.25 mm/rev for the smaller drill and 0.64 mm/rev for the larger drill. The center drilling operation requires 0.5 min. To set or change any given tool and set the proper machine speed and feed requires 1 min. Select the initial cutting speeds, and compute the total time required for doing the job. (Neglect setup time for the fixture.) This is often referred to as the run time or the cycle time.

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The feed given in the problem for boring is 05 mmrev or about 002 ... View full answer

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