Question

6 cm diameter and 20 cm long work piece rotates at 200 rpm. Axial feed is 0.1 mm per revolution. The time taken to machining is
1. 6 minutes
2. 20 minutes
3. 10 minutes
4. None of these

Answer 1

Correct Answer - Option 3 : 10 minutes

Concept:

Machining time is given as,  \(T = \frac{L}{{f \times N}}\)

where L = length of job, 

Calculation:

Given:

L = 20 cm = 200 mm, N = 200 rpm; f = 0.1 mm/revolution

Time taken to machining,

\(T = \frac{L}{{f \times N}}\)

\(T = \frac{200}{{0.1\times200}}\)

∴ \(T = \frac{1}{{0.1}}~min\) 

∴ T = 10 min.