A punching press pierces 40 holes per minute in aplate using 10 kN-m of energy_per hole during eachrevolution. Each piercing takes 35 per cent of the timeneeded to make one revolution. The punch receivespower through a gear reduction unit which in turn isfed by a motor driven belt pulley 770 mm diameterand turning at 250 r.p.m. Find the power of the electricmotor if overall efficiency of the transmission unit is 88per cent. Design a cast iron flywheel to be used withthe punching machine for a coefficient of steadinessof 5, if the space considerations limit the maximumdiameter to 1.3 m.Allowable shear stress in the shaft material = 50 MPaAllowable tensile stress for cast iron = 4 MPaDensity of cast iron = 7200 kg/m3 CAST IRON FLYWHEELRHubArmRimHubArmR-rRRimTRn

Given-Information:- Number of Holes, 40 per min Energy per hole, 10 kN-m = 10,000 N-m Diameter, d =…

Answered: to make one revolution. The rough a…

Engineering

Mechanical Engineering

to make one revolution. The rough a gear reduction unit motor driven belt pulley 77

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

Power Transmission Elements

It is defined as the energy transfer from one location to another location. The energy will start moving from the energy generation source to the energy applied position to obtain the work output. From this method, a large amount of electric energy moves from the power station to various electrical substations.

Question

A punching press pierces 40 holes per minute in a
plate using 10 kN-m of energy_per hole during each
revolution. Each piercing takes 35 per cent of the time
needed to make one revolution. The punch receives
power through a gear reduction unit which in turn is
fed by a motor driven belt pulley 770 mm diameter
and turning at 250 r.p.m. Find the power of the electric
motor if overall efficiency of the transmission unit is 88
per cent. Design a cast iron flywheel to be used with
the punching machine for a coefficient of steadiness
of 5, if the space considerations limit the maximum
diameter to 1.3 m.
Allowable shear stress in the shaft material = 50 MPa
Allowable tensile stress for cast iron = 4 MPa
Density of cast iron = 7200 kg/m3

CAST IRON FLYWHEEL
R
Hub
Arm
Rim
Hub
Arm
R-r
R
Rim
T
Rn

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