50. An open coil helical spring is made of wire 10 mm diameter. It has 15 coils of mean coil diameter 6 cm. What is the greatest axial compressive load that can be applied to the ends of the spring if the principle stress not to exceed 120 MPa, and maximum shear stress is not to exceed 80 MPa. Calculate for this load the axial and angular deflec- tion of the spring. E = 2 × 105 MPa, G = 0·8 × 105 MPa. %3D
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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