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A brass pin has a length of 500 mm and 40 mm in diameter. The pin is to be reduced to 38.8 mm in one pass. The cutting speed is 60 m/min feed is 0.8 mm/rev and rpm is 478. The machining time will be
1. 1.31 min
2. 2.62 min
3.  3.93 min
4.  5.24 min

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Correct Answer - Option 1 : 1.31 min

Concept:

Time for machining \(= \frac{L}{{f.N}}\)

where L is job length (mm), f is feed (mm/rev), N is job speed (rpm)

Calculation:

Given:

Cutting speed = 478 rpm, f = 0.8 mm/rev, L = 500 mm, D = 40 mm, V = 60 m/min

Time for machining \(= \frac{L}{{f.N}} = \frac{{500}}{{0.8 × 478}} = 1.31\;min\)

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