saej182v003

SAETechnicalStandardsBoardRulesprovidethat:“ThisreportispublishedbySAEtoadvancethestateoftechnicalandengineeringsciences.Theuseofthisreportisentirelyvoluntary,anditsapplicabilityandsuitabilityforanyparticularuse,includinganypatentinfringementarisingtherefrom,isthesoleresponsibilityoftheuser.”SAEreviewseachtechnicalreportatleasteveryfiveyearsatwhichtimeitmaybereaffirmed,revised,orcancelled.SAEinvitesyourwrittencommentsandsuggestions.Copyright©2005SAEInternationalAllrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystemortransmitted,inanyformorbyanymeans,electronic,mechanical,photocopying,recording,orotherwise,withoutthepriorwrittenpermissionofSAE.TOPLACEADOCUMENTORDER:Tel:877-606-7323(insideUSAandCanada)Tel:724-776-4970(outsideUSA)Fax:724-776-0790Email:custsvc@sae.orgSAEWEBADDRESS:http://www.sae.orgSURFACEVEHICLERECOMMENDEDPRACTICEJ182REAF.APR2005Issued1973-09Reaffirmed2005-04SupersedingJ182AUG1997MotorVehicleFiducialMarksandThree-dimensionalReferenceSystem1.Scope—ThisSAERecommendedPracticedescribesaprocedureforlocatingthethree-dimensionalreferencesystemonamotorvehicleasbuilt.1.1Purpose—Forcompletemotorvehicledimensionalchecks,amethodisrequiredforlocatingthethree-dimensionalreferencesystemonamotorvehiclesothatpointsofinterest(forexample,drivereyelocation,seatingreferencepoint,centerlineofmotorvehicle,etc.)canbedetermined.1.2Rationale—ThisdocumenthasbeenreaffirmedtocomplywiththeSAE5-YearReviewpolicy.2.References—Therearenoreferencedpublicationsspecifiedherein.3.Definitions3.1Three-dimensionalReferenceSystem—Therelationshipofthreeorthogonalplanesestablishedbythemanufacturersintheinitialdesignstagesofthevehiclethatremainpermanent(seeFigure1).Theplanesareusedtodeterminedimensionalrelationshipsforcomponentsinandaroundthevehicleandaredefinedasfollows:3.1.1ZERO"Y"PLANE—Centerlinebodyzeroplaneisaverticalplanewhichpassesthroughthelongitudinalcenterlineofthecar.3.1.2ZERO"X"PLANE—Verticalbodyzeroplaneisaplanenormaltothe"Y"plane.Thisplaneistypicallyinfrontofthevehicletoeliminatetheuseofnegativenumbers.3.1.3ZERO"Z"PLANE—Horizontalbodyzeroplaneisaplanenormaltothe"X"and"Y"planes.Itsrelationshiptothehorizontalisdeterminedbythefiducialmark.Thisplaneistypicallyslightlyabovethegroundforallloadedconditionstoeliminatetheuseofnegativenumbers.3.1.4NEGATIVECOORDINATE—Thenegativedirectionisforwardof"X"plane,leftofthe"Y"plane,andbelow"Z"plane.3.1.5COORDINATEDIMENSION—Allpointsofinterestaredescribedascoordinatedimensionedfromtheintersectionofthezeroplanesinthethree-dimensionalreferencesystem.X,Y,Zcoordinatesaredimensionedtotheirrespectiveplanes.SAEJ182ReaffirmedAPR2005-2-3.2FiducialMarks—Theseareidentifiableholes,surfaces,marks,orindentations,onthevehiclebody,visibleandaccessiblefromoutsidethevehicleasdescribedbythemanufacturer.FIGURE1—THREEDIMENSIONALREFERENCESYSTEM4.Requirements—Theminimumofthreefiducialmarksshallbespecified,oneoneachsideofthe"Y"plane(usuallysymmetricalforconvenience)andanadditionaloneforwardorrearwardofthefirsttwo,allasfarapartasallowableandusable.5.Procedure5.1Positionthemotorvehicleonalevelsurface.5.2Adjustmotorvehicleheightandattitudetoagroundreferenceplaneasdefinedbythemanufactureraccordingtothefiducialmarks.5.3Locatethedimensionreferencesystemonthemotorvehicle.Locationsofinterestcannowbedimensionedintheactualmotorvehiclewithrespecttothedesignedmotorvehicleusingcoordinatesinthethree-dimensionalreferencesystem.PREPAREDBYTHESAEHUMANACCOMMODATIONANDDESIGNDEVICESTECHNICALCOMMITTEE