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Mission:Possible!FlatnessMeasurementofHPTurbineShellJune6,2011Tags:flatnessmeasurement,hpturbineshell,surfaceflatness

Recently,aflatnessmeasurementwasneededontwohalvesofanHPturbineshellusingLEVALIGNsystem.Thetophalf(restingupsidedown)wasatypicalquickandeasymeasurement,asshownbelowinFigure1:

Figure1

Thesecondhalf,wasnotsotypical.Thestudshadtoremainintheshellandthecustomerwonderedifourtoolcouldstilltakethemeasurementwiththelineofsightobstructionsforthelaserfromthestuds.TheanswerwasYES!

TheuniqueInfiniSplicefeatureoftheLEVALIGNallowedforthistohappenwithouthavingtoresorttocustombracketstoshootoverthetopofthestuds.InfiniSpliceallowsformultiplesetsofmeasurementstobecombinedintooneunifiedmeasurement.Thisisbasedontheconceptthattwosetsofmeasurementscanbeunifiedormergediftheyhavethreeormorepointsmeasuredincommon.

Itssimple.JustmeasureasmanypointsasyoucanwiththeLEVALIGNlaseremitterinthefirstposition.SeeFigure2.

Figure2

Thenmovethelasertoanotherpositionandmeasureanypointsyoucouldntmeasurewiththefirstmeasurementsetupplusatleastthreepointsthatyoudidmeasurewiththeprevious

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setup.SeeFigure3.

Figure3

Nowmovethelaseryetagain,andrepeatmeasuringtheremainderofthepointsplusthreepointsfromeitherthefirstorsecondmeasurement.SeethethirdsetupinFigure4.Thisprocesscanberepeatedasmanytimesasneeded,hencethetermInfiniSplice.

Figure4

Justopenallthree(ormore)filesintheALIGNMENTCENTERsoftwareandtheyaretheninstantlycombinedintooneunifiedmeasurement.Noneedtoselectthesplicepoints,thesoftwareknowswhichonestouse.Ifyoucanopenthreefiles,youcaninstantlysplicethem.Itsjustthatsimple.

Figure5showsthecombinedflatnessprofileofthelowerhalfoftheturbinecasing,takeninspiteoftheobstructionspresentedbyallthestuds.

Figure5

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