Question:-
The arm of a radial drilling machine is being raised at a speed of 3.9 m/min by single start square threads of 6 mm pitch and 30 mm diameter. The speed of the screw
Option (A)
Is 650 rpm
Option (B)
Is 180 rpm
Option(C)
Is 130 rpm
Option(D)
Cannot be determined as the data is insufficient
Correct Option:
(A)
Question Solution:
r.p.m = (3.9 x 103(mm/min) / 6mm) = 650 r.p.m
question-answer-faq-8964