Engineering Drawing and CAD Standards

MORAINEVALLEYCOMMUNITYCOLLEGERevision:May11,2010EngineeringDrawing&CADStandardsMechanicalDesign/CADProgramC.Bales,M.Vlamakis9000WESTCOLLEGEPARKWAY,PALOSHILLS,ILLINOIS,60465EngineeringDrawing&CADStandards20109000WestCollegeParkway,PalosHills,Illinois,60465PageI-2TABLEOFCONTENTSI.LineConventions................................................................................................................................................I-4Centerlines.............................................................................................................................................................I-4II.DrawingConventions........................................................................................................................................II-8AuxiliaryViews.......................................................................................................................................................II-8PartialViews..........................................................................................................................................................II-8SectionViews.........................................................................................................................................................II-8ConventionalBreaks..............................................................................................................................................II-9Developments......................................................................................................................................................II-10III.DimensionConventions.................................................................................................................................III-10DimensionAppearance.......................................................................................................................................III-10DimensioningProcedure....................................................................................................................................III-13DimensionNotes................................................................................................................................................III-13PreferredSizes....................................................................................................................................................III-16IV.ThreadandFastenerRepresentation............................................................................................................IV-17V.Tables..............................................................................................................................................................V-22Billofmaterials....................................................................................................................................................V-22Revisiontables.....................................................................................................................................................V-22VI.Drawingmedia...............................................................................................................................................VI-23EngineeringDrawing&CADStandards20109000WestCollegeParkway,PalosHills,Illinois,60465PageI-3TheinformationcontainedinthisdepartmentalstandardsupersedestheASMEstandardslistedbelow:ANSI/ASMEY14.2M-1992(R2003)LineConventionsandLetteringANSI/ASMEY14.3-2003MultiandSectionalViewDrawingANSI/ASMEY14.34M-1996PartsLists,DataLists,andIndexListsANSI/ASMEY14.36M-1996(R2002)SurfaceTextureSymbols–MetricVersionANSI/ASMEY14.35M-1997(R2003)RevisionofEngineeringDrawingandAssociatedDocumentsANSI/ASMEY14.38-1999AbbreviationsandAcronymsANSI/ASMEY14.5-2009DimensioningandTolerancingANSI/ASMEY14.6-2001(R2007)ScrewThreadRepresentation,EngineeringDrawing,andRelatedDocumentationPracticeANSI/ASMEY14.6AM-2001(R2007)ScrewThreadRepresentations(MetricSupplement)EngineeringDrawing&CADStandards20109000WestCollegeParkway,PalosHills,Illinois,60465PageI-4I.LINECONVENTIONSA.ThelinesshowninFigure1.1aretobeusedinallmechanicaldrawings.ThecorrespondingAutoCADlinetypeandlineweightaregivennexttoeachlinetype.FIGURE1.1:STANDARDLINESTYPESANDLINEWEIGHTS.B.TheAutoCADlinetypescale(LTSCALE)formechanicaldrawingsplottedatascaleof1:1shallbesetaccordingtothetableshownbelow:SystemofMeasurementLTSCALEDrawingscaleDecimal-inch0.51:1Metric121:1C.Thelinetypescaleshallbemodifiedproportionallyfordrawingsplottedatscalesotherthan1:1.Forexample,ifthedrawingscaleis1:2forametricdrawing,theLTSCALEshallbesetto6(=12x½).CENTERLINESD.ThecentermarksizedimensionvariableinAutoCADshallbe.09”(2mm).E.Thecentermarkshallextend.09”(2mm)beyondtheedgesofcircularfeatures(seeFigure1.2).EngineeringDrawing&CADStandards20109000WestCollegeParkway,PalosHills,Illinois,60465PageI-5F.Acenterlinerepresentingthelongitudinalaxisofacylindricalorrectangularfeatureshallextend.312”(8mm)beyondtheboundaryofthefeature(seeFigure1.2).FIGURE1