What would be the time required to machine 250 shafts of mild steel 100 mm in diameter and 440 mm long with a carbide tool.

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What would be the time required to machine 250 shafts of mild steel 100 mm in diameter and 440 mm long with a carbide tool. The cutting speed is 90 mm and the feed is 0.3 mm per revolution. Assume the handling time for each piece as 3 minutes and 2 minutes for centre drilling each piece.

Estimate the cost of each shaft if the material cost is Rs. 15 per kg. The labour and overhead charges are Rs. 20 per hour. Density of job material is 8.6 gm per c.c. The time required for sawing each piece to length is 30 seconds and allow 4 mm of length for each saw cut. Lathe set up time is 15 minutes.

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