A machine has to carry out punching operation at the rate of 10 holes per minute. It does 6 kN-m of work per mm? of the sheared area in cutting 25 mm diameter holes in 20 mm thick plates. A flywheel is fitted to the machine shaft which is driven by a constant torque. The fluctuation of speed is between. 180 and 200 r.p.m. The actual punching takes 1.5 seconds. The frictional losses are equivalent to 1/6 of the work done during punching. Find: 1. Power required to drive the punching machine, and 2. Mass of the flywheel, if the radius of gyration of the wheel is 0.5 m. [Ans. 1.588 W: 686 kg)
A machine has to carry out punching operation at the rate of 10 holes per minute. It does 6 kN-m of work per mm? of the sheared area in cutting 25 mm diameter holes in 20 mm thick plates. A flywheel is fitted to the machine shaft which is driven by a constant torque. The fluctuation of speed is between. 180 and 200 r.p.m. The actual punching takes 1.5 seconds. The frictional losses are equivalent to 1/6 of the work done during punching. Find: 1. Power required to drive the punching machine, and 2. Mass of the flywheel, if the radius of gyration of the wheel is 0.5 m. [Ans. 1.588 W: 686 kg)
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:A machine has to carry out punching operation at the rate of 10 holes per minute. It does 6 kN-m of
work per mm2 of the sheared area in cutting 25 mm diameter holes in 20 mm thick plates. A flywheel
is fitted to the machine shaft which is driven by a constant torque. The fluctuation of speed is between
180 and 200 r.p.m. The actual punching takes 1.5 seconds. The frictional losses are equivalent to
1/6 of the work done during punching. Find: 1. Power required to drive the punching machine, and 2.
Mass of the flywheel, if the radius of gyration of the wheel is 0.5 m.
[Ans. 1.588 W: 686 kg)
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