Transcription of Engineering Metrology
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Engineering Metrology
Engineering MetrologyProf. J. RamkumarDepartment of Mechanical EngineeringIIT KanpurOctober 24, 2017 OutlineIntroduction and Types of InstrumentsEngineering ToleranceCommon Metrology InstrumentsCommon Metrology Instrumentscoordinate measuring machine (CMM)Introduction to MetrologyIMetrology is the science of measurementIDimensional Metrology is that branch of Metrology whichdeals with measurement of dimensions of a part or workpiece(lengths, angles, etc.)IDimensional measurements at the required level of accuracyare the essential link between the designer s intent and adelivered width, depth, angles and other dimensions all must beproduced and measured accurately for the machine tool tofunction as : Metrology is a vast area. In this lecture, the mainfocus on Dimensional MetrologyDimensional Metrology NeedsILinear measurementsIAngular measurementsIGeometric form measurements(Roundness, Straightness,Cylindricity, Flatness etc.)IGeometric relationships(Parallel, perpendicular,Concentric,runout etc.)
Linear Measurement Devices I Vernier Caliper: It is a visual aid that allows the user to measure more precisely than could be done unaided when reading a uniformly divided straight or circular measurement scale. Least count: The least count of a measuring instrument is the smallest change in the measured quantity that can be
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