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The following data is applicable for a turning operation. The length of job is 900 mm, diameter of job is 200 mm, feed rate is 0.25 mm/rev and optimum cutting speed is 300 m/min. The machining time (in min) is_______.
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- 7.539
- 9.539
- 6.539
- 8.539
Correct Option: A
L = 900 mm
d = 200 mm
f = 0.25 mm/rev
v = 300 m/min
t =?
v = π DN m/min
| N = | = | = 478 rpm | ||
| πD | π × 0.2 |
| t = | = | ≈ 7.539 min | ||
| f.N | 0.25 × 478 |
