Question:-
The time taken to face a work piece of 72 mm diameter, if the spindle speed is 80 r.p.m. and cross-feed is 0.3 mm/rev, is
Option (A)
1.5 minutes
Option (B)
3.0 minutes
Option(C)
5.4 minutes
Option(D)
8.5 minutes
Correct Option:
(A)
Question Solution:
Time = (radius / (f x N))

= (36/(0.3 x 80)) = 1.5 minutes.
question-answer-faq-8985