In a punching press, the requirement is to punch 40 mm diameter holes in a plate having a thickness of 15 mm. The rate at which the holes should be punched is 30 holes/min. Energy requirement is of 6 N-m per mm2 of sheared area. If the punching takes time 1/10 of a second and the speed of the flywheel varies from 160 to 140 rpm, determine the mass of the flywheel having radius of gyration of 1 m.
(a) 327 Kg
(b) 654 Kg
(c) 163.5 Kg
(d) 200 Kg
The question was posed to me during an online interview.
This question is from Flywheel in a Punching Press in portion Turning Moment Diagrams and Flywheel of Machine Dynamics