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]

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]

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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Concept explainers

Clutches, Brakes, Couplings, and Flywheels

The clutch is described as a machine element used to connect or disconnect two shafts together to transmit torque or power. The clutch works on the principles of friction. The clutch is commonly used in automobiles to transfer power from the driving shaft to the driven shaft.

Question

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 dríven 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.
[Ans. 1.588 W; 686 kg]
Mass of the flywheel, if the radius of gyration of the wheel is 0.5 m.

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