Steel shafts, 1.4 inches in diameter, are turned on an automatic machine. One finishing operation is required for an 11.5-inch length of cut. The tool feed is 0.023 inch per revolution using a cutting speed of 200 feet per minute. Using the formulas in the accompanying figure, determine the number of hours of cutting time required for 1500 shafts. Round the answer to the nearest hour.
What will be an ideal response?
N = 12C/3.1416D = 12 x 200/(3.1416 x 1.4) = 545.6728T = L/FN = 11.5/(0.023 x 545.6728) = 0.9163 minutes0.9163 minutes x 1500 shafts = 1374.45 min1374.45 min/60 = 23 hrs
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