The threading of G.I. pipes for installation of water system may be accomplished using two competing threading machines. Data for each are as follows: Mechanical threader 35,000 pesos Electric powered threader 55,000 pesos 80 pesos per hour Cost of machine Machine operator Helper Productivity (pipes/hour) 45 pesos per hour 5 pesos per pipe threaded 3 pipes per hour 15 pipes per hour 50 centavos per pipe threaded Power If a) 900 b) 1500 pipes need to be threaded for this project, which machine should be bought and used? Solution: a. 900 PIPES Cost items Mechanical threader Electric powered threader Cost of machine Operator Helper Power Total b. 1500 PIPES Cost items Mechanical threader Electric powered threader Cost of machine Operator Helper Power Total Decision:
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.
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