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NavinJass,AP/MECHMEMETROLOGY&MEASUREMENTSMethodsofmeasuringsurfacefinishThemethodsusedformeasuringthesurfacefinishis EstimateroughnessandmeasureitincorrespondingconditioninthetableChangeconditionaccordingwithaboveresultandmeasureitagainRepeat“”iftheresult roughness,surfacefinish,surfacetextureCreatedDate:ZCut-offThewavelengthatwhichafilterbecomeseffectiveProfInterpretthesurfacefinishsymbolsthat appearonadrawingPaulingSurfaceFinishisameasureoftheoveralltextureofasurfacethatischaracterizedbythelay,surfaceroughness,andwavinessofthe surfaceOutlineThisisincontrasttolarger-scalevariationsAnumberofmethodsareavailabletomeasuresurfacefinish;methodsofstylusprofilingandoptical profilingareemphasizedhereSurfaceroughnessdepthRz,asarule,isusedforallothersurfacesThearithmeticaverageroughnessvalueRahardlyreactsto peaksorvalleysduetothemeanvalueformationObjectivesTechnicalReportMaterialcomponentoftheprofileRmr(c)forguidesurfacesandsealingsurfaces movingagainstoneanotherSurfaceroughnessdepthRz,asarule,isusedforallothersurfacesThearithmeticaverageroughnessvalueRahardlyreactstopeaks orvalleysduetothemeanvalueformationfromallprofilevaluessothatitssignificanceisratherlowMeasurementconditionsforroughnessmeasurements(DIN ENISO)Non-periodicprofilesPeriodicThemethodsusedformeasuringthesurfacefinishisclassifiedintoInspectionbycomparisonDirectInstrument MeasurementsInspectionbycomparisonmethods:InthesemethodsthesurfacetextureisassessedbyobservationofthesurfaceSurfaceroughnessmeasurement isthemeasurementofthesmall-scalevariationsintheheightofaphysicalsurfacesealingsurfacesWavinessheight:peak-to-valleydistanceininchesormillimeters Setupsforroughnessmeasurement(ENISO)MaximumroughnessdepthRz1maxforsurfacesinwhichindividualdeviationshaveasignificantinfluenceonthe functionofthesurface,egMEASURINGSURFACEFINISHESTR(RevSurfaceFinish,whenitisintendedtoincludeallthreecharacteristics,isoftencalled SurfaceTexturetoavoidconfusion,sincemachinistsoftenrefertoSurfaceRoughnessasSurfaceFinishUseasurfacefinishindicatortomeasurethesurfacefinish ofapartIfyoulookatmachinedparts,youwillnoticethattheirsurfacesembodyacomplexshapemadeofaseriesofSurfaceFinishCharacterizationand Measurement“Cutoff”isalsousedsynonymouslywithSampleLengthasthesamplelengthisalwayssettoLcSurfaceFinishDefinitionsMethodsusedto measureandrecordsurfacefinishes,describessurfacefinishvalues,andexplainshowtospecifysurfacefinishesformachinedpartsForsurfaceparameterswe normallyanalysewavelengthsbetweenanupperandlowercut-off:thesearereferredtoasLsorλs(shortest)andLcorλc(longest)SurfaceFinishMeasurement 1AboutSurfaceRoughnessWhatisSurfaceRoughness?Waviness:surfaceirregularitiesthatdeviatefrommeansurfaceinformofwavesImportanceof DefinitionSurfacedeviations:departuresfromnominalsurfaceinformofwaviness,roughness,flaws,lay,andprofileB;)()PaulingDocumentarystandardsfor measurementofMr.P.ThesurfacetobetestediscomparedwithknownvalueofroughnessspecimenMeasuringSurfaceFinishes.S.S.Pande.Mechanical EngineeringDepartmentIndianInstituteofTechnology,Bombay