A punching machine requires 1600 ft-lb of energy to punch a certain hole. During the punching operation, the speed of the machine is reduced from 180 rpm to 160 rpm. The weight of the arms and hub is considered to be 10 % of the rim weight, and the mean diameter of the flywheel is 32 inches. a) What is the mean or operating rpm of the flywheel? b) Find the coefficient of fluctuation. c) What is the maximum speed of the flywheel, in fps? d) What is the minimum speed of the rim, in fps?
Theory and Design for Mechanical Measurements
Measurement is a term that refers to analyzing a manufactured component regarding the degree of accuracy for dimensions, tolerances, geometric profile, roundness, flatness, smoothness, etc. Measurement always involves comparing the manufactured component or the prototype with a standard specimen whose dimensions and other parameters are assumed to be perfect and do not undergo changes with respect to time.Precisely in mechanical engineering the branch that deals with the application of scientific principles for measurements is known as metrology. The domain of metrology in general deals with various measurements like mechanical, chemical, thermodynamic, physical, and biological measurements. In mechanical engineering, the measurements are limited to mechanical specific such as length, mass, surface profile, flatness, roundness, viscosity, heat transfer, etc.
Basic principles of engineering metrology
Metrology is described as the science of measurement, precision, and accuracy. In other words, it is a method of measurement based on units and predefined standards.
A punching machine requires 1600 ft-lb of energy to punch a certain hole. During the punching operation, the speed of the machine is reduced from 180 rpm to 160 rpm. The weight of the arms and hub is considered to be 10 % of the rim weight, and the mean diameter of the flywheel is 32 inches.
a) What is the mean or operating rpm of the flywheel?
b) Find the coefficient of fluctuation.
c) What is the maximum speed of the flywheel, in fps?
d) What is the minimum speed of the rim, in fps?
d) Determine the weight of the rim, in lb.
e) What is the weight of the flywheel, in lb?
f) Determine the weight of the arms and hub, in lb.
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