Comprehension A low carbon steel bar of 147 mm diameter with a length of 630 mm is being turned with uncoated carbide insert. The observed tool lives

Question

Neglect over-travel or approach of the tool. When tool life is 20 min, the machining time in min for a single pass is
1. 5
2. 10
3. 15
4. 20

Answer 1

Correct Answer - Option 3 : 15

V = π DN

Then, N = 210.19 rpm

\(\therefore Machining\ time,\ {t_m} = \frac{L}{{fN}} = 14.98\ min\)