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Question: a lathe performs a turning operation on a workpiece of...

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A lathe performs a turning operation on a workpiece of 6.0 in diameter. The shear strength of the work is 40,000 lb/in2 and the tensile strength is 60,000 lb/in2. The rake angle of the tool is 60. The cutting speed- 700 ft/min, feed 0.015 in/rev, and depth-0.090 in. The chip thickness after the cut is 0.025 in. Determine (a) the horsepower required in the operation, (b) unit horsepower for this material under these conditions, and (c) unit horsepower as it would be listed in Table 21.2 for a to of 0.010 in. Use the orthogonal cutting model as an approximation of the turning process.

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