cad原理2011年-第六章第一頁(yè)，共99頁(yè)。Pro/ETrainingWildfire2.0Interface第二頁(yè)，共99頁(yè)。Pro/ENGINEERWildfire2.0CoreConcepts6個(gè)核心概念:SolidModelingFeatureBasedParametricParent/ChildRelationshipsAssociativeModelCentricStartwithPro/ENGINEER第三頁(yè)，共99頁(yè)。StartwithPro/ENGINEER

? UserInterface,ViewControlsandModelStructure? CreatingaSimpleObject –RevolvedProtrusions,MirrorCopies,Rounds,andChamfers –ModelingUtilitiesandthe3R's –DatumsandSketcherTools–PatternsandCopies–SweepsandBlends? EngineeringDrawings? AssemblyFundamentals –AssemblyOperations? Animation第四頁(yè)，共99頁(yè)。SolidModelingPro/ENGINEERWildfire2.0allowsyoutoeasilycreate

3Dsolidmodels,enablingyoutovisualizepartsandassemblieswitharealisticappearance.

Basedonmaterialpropertiessuchasdensity,thesemodelshavemass,volume,surfaceareaandotherphysicalpropertiessuchasacenterofgravity（重心）.

例子：一個(gè)鑄鋁發(fā)動(dòng)機(jī)部件，這個(gè)模型以毫米尺寸建模，具有質(zhì)量特征，以123為標(biāo)記的坐標(biāo)系統(tǒng)表達(dá)了模型的重心.Thefollowingareadvantagesofsolidmodeling:如果模型改變了，如增加了冷卻翅，那么所有的質(zhì)量特征會(huì)自動(dòng)更新。實(shí)體模型可以允許檢查公差和裝配過(guò)程中的容差/干涉

第五頁(yè)，共99頁(yè)。?Pro/ENGINEERallowsyoutoeasilycreate3Dsolidmodels,enablingyoutovisualizepartsandassemblieswitharealisticappearance.?Basedonmaterialpropertiessuchasdensity,thesemodelshavemass,volume,surfaceareaandotherphysicalpropertiessuchasacenterofgravity.?VOLUME=3.332e+04MM^3 SURFACEAREA=2.488e+04MM^2 DENSITY=2.7e-06KG/MM^3 MASS=8.998e-02KG CENTEROFGRAVITY X=-0.642MM Y=20.508MM Z=24.194MM?SolidModelanditsMassPropertiesSolidModeling第六頁(yè)，共99頁(yè)。FeatureBasedPro/ENGINEERmodelsareconstructedusingaseriesoffeatures.Eachfeaturebuildsuponthepreviousfeature,creatingthemodelonefeatureatatime.Individuallyeachfeaturecanbesimple,butcollectivelycanformcomplexpartsandassemblies.AnExtrudefeatureformstheoverallshapeandsizeofthemodel.AdditionalExtrudefeaturescreatedatthetopandbottomofthemodel.Holefeaturescreatedatthetopandbottomofthemodel.Roundfeaturescreatedatthetopandbottomofthemodel.第七頁(yè)，共99頁(yè)。Pro/ENGINEERWildfire2.0modelsaredrivenusingdimensionvalues.

Ifadimensionofafeatureischanged,thatsolidfeaturewillupdate.

Thischangewillthenautomaticallypropagatethroughtheremainingfeaturesinthemodel,updatingtheentirepart.ParametricModelingUnder-dimensioningandOver-dimensioning第八頁(yè)，共99頁(yè)。Parent/Childrelationshipsprovideapowerfulwaytocaptureyour"designintent"intoamodel.

Parent/Childrelationshipsarenaturallycreatedbetweenfeaturesduringthemodelingprocess.

Whencreatingafeature,existingfeaturesthatarereferencedbecomeparentstothenewfeature.

Also,iftheparentfeaturesareupdated,thechildfeatureswillautomaticallyupdateaccordingly.ThePISTONmodelhasaheightof18.5,withahole

dimensioned8fromthetopsurface.

Theheightdimensionisthenmodifiedto24,andthemodelisRegeneratedtoupdateitsfeatures.

Noticethattheparent/childrelationshipbetweentheholeandthebodyofthemodelforcestheholetomoveupwardstomaintainthe8dimension.Parent/ChildRelationships第九頁(yè)，共99頁(yè)。EditingHeightofthePISTONThisbehavior(theholereferencingthetopsurface)isanexampleofthedesignintentthatwasbuiltintothismodel.

Alternatively,theholecouldhavereferencedthebottomsurface,yieldingadifferenteffectwhenthemodelheightismodified.第十頁(yè)，共99頁(yè)。Ifapartmodel

ischangedin

Pro/ENGINEERWildfire2.0,anyassembliesordrawingsthatreferencethatmodelwillautomaticallyupdate.

ThisbehaviorisknownasAssociativityandalsoworksinreverse-ifamodeldimensioninadrawingisupdated,thepartmodelandtheassemblyitisusedinwillupdate.Thepartmodelisthecentralsourceofdesigninformation.

Onceapartmodelis

created,itcanbe:- Placed

inanassembly-Dependingonhowcomponentsareassembled,thecomponentscanbestationaryorallowedtomoveasamechanism.- Usedtocreateadrawing-2Dviewsofthemodelcanbequicklyplacedonadrawingsheet,anddimensionscanbeautomaticallyshown.Associative&ModelCentric第十一頁(yè)，共99頁(yè)。ModelAssociativity第十二頁(yè)，共99頁(yè)。Pro/ENGINEEERWildfire2.0InterfaceGraphicsWindow-Largegrayareawherethemodelisvisible.Navigator-collapsiblepanelsontheleftofthescreen.Browser-Amulti-functionalwebbrowser,showndisplayingalist ofmodelsandasmallpreviewwindowinthecenterofthescreen.- ModelTree-Liststhefeaturesofapart,orthecomponentsinanassemblyontheleftofthescreen.- FolderBrowser(notshown)-Displaysontheleftofthescreeninplaceofthemodeltree,andlistsfoldersonyourcomputerornetwork.

YoucanbrowsefoldersandviewtheircontentsintheBrowser.MainToolbar-Anicontoolbarlocatedatthetopofthescreen.

FeatureToolbar-Anicontoolbarlocatedattherightofthescreen.Dashboard(notshown)-Adialogbarlocatedatthebottomofthescreenwhencreatingfeatures.第十三頁(yè)，共99頁(yè)。第十四頁(yè)，共99頁(yè)。第十五頁(yè)，共99頁(yè)。第十六頁(yè)，共99頁(yè)。第十七頁(yè)，共99頁(yè)。第十八頁(yè)，共99頁(yè)。第十九頁(yè)，共99頁(yè)。第二十頁(yè)，共99頁(yè)。第二十一頁(yè)，共99頁(yè)。第二十二頁(yè)，共99頁(yè)。第二十三頁(yè)，共99頁(yè)。第二十四頁(yè)，共99頁(yè)。第二十五頁(yè)，共99頁(yè)。第二十六頁(yè)，共99頁(yè)。Information –FeatureDatabase –FeatureInformationGeometricTopologicalSuppressingFeaturesFeatureChange –AlteringFeature –AlteringFeatureRelationsDatumPlanes –Introduction –Use第二十七頁(yè)，共99頁(yè)。PatternedFeature –PlacementPlane –TheFirstFeature –SpecifyingtheRepeatedPatternUsingthePatternControl Dimensions(incrementandnumberofinstance)DrawingGeneration –DrawingSelection –OrientthePart –AdditionalViewSelections –Adding/AdjustingDimensions –SectionViews第二十八頁(yè)，共99頁(yè)。AssemblyModel –StarttheModel(notdrawing) –LoadComponents –SpecifyAssemblyRelations ?Mate(thecontactfaces) ?Align ?Insert –DisplaytheAssembly ?Color ?Exploding ?ComponentPositionAdjustment ?Enhancement(DifferentTypesofDisplay)第二十九頁(yè)，共99頁(yè)。SweepFeature –CurvedProtrusion ?Simpleopentrajectory ?Simplecross-section –ComplexShape ?Complexclosedtrajectory ?Opencross-sectionParallelBlendFeature –Twocross-sections –Differenttypeofblending第三十頁(yè)，共99頁(yè)。DatumPlanes –Differenttypesofdatum –Functionofdatumplanesandtheirintroduction ?Definition –ThroughAxis –Angle –Offset –Normal

?ServingastheSketchingPlane ?ServingastheReference–Effectiveuseofdatumplanes第三十一頁(yè)，共99頁(yè)。.ContentsPro/ENGINEERWildfire2.0CoreConcepts

LearnPro/ENGINEERWildfire2.0basicsExercise1:Opening,Orienting,andEditingModels

DescribePro/ENGINEERWildfirefundamentals.NavigatethePro/ENGINEERWildfireinterface.Exercise2:CreatingPartModels

Preview,open,andorientdesignmodels.Createbasicpartmodels.第三十二頁(yè)，共99頁(yè)。.ContentscontinueExercise3:CreatingAssemblies

Createanassembly.Runasimplemechanism.Exercise4:CreatingDrawings

Createadrawingwithviewsofanassemblyandapart.Showandmanipulatedimensionsondrawingviews.Exercise5:ModelAssociativity

Modifyamodelandobserve

theassemblyanddrawingupdate.Checkforassemblyinterferences.第三十三頁(yè)，共99頁(yè)。Exercise

1:Opening,Orienting,andEditingModelsOverview-Inthisexercise,youwilllearnthreebasicskillsthatareessentialwhenmodelingwithPro/ENGINEERWildfire2.0Previewandopendesignmodels-

Youwill

usethe

NavigatorandBrowsertobrowsefolders,previewmodels,andopenmodels.

Orientdesignmodels-Afteropeninganexistingmodel,youwilluseacombinationofkeyboardandmousecommandstoSpin,Pan,andZoommodels.Editexistingdesignmodels-Afterlearningbasicmodelorientation,youwilluseeditingoptionstomodifyexistingmodels第三十四頁(yè)，共99頁(yè)。

WorkingDirectoryTheWorkingDirectorysetsthedefaultfolderforopeningandsavingmodels.

Task1-1.OpentheENGINE_BLOCK.PRTusingtheNavigator.StartPro/ENGINEERWildfire2.0ifnecessary.ThedefaultwebpagedisplayedinthebrowseristhePro/ENGINEERWildfire2.0landingpage.IntheFolderBrowser

(leftofthescreen),locatetheHOW_INTRO-WF2

folder,andexpandit

byclickingthe'+'.

ClickontheProE_modelsfoldertoviewitscontentsinthebrowser.RightclickontheProE_modelsfolderandselectSetWorkingDirectory.SelecttheENGINE_BLOCK.PRTfromthebrowser.a. Noticeamodelpreviewappearsinthebrowser.第三十五頁(yè)，共99頁(yè)。Task1-1.OpentheENGINE_BLOCK.PRTusingtheNavigator.fromthebrowser(totherightofthepreview).6. ClickOpenPro/Efromthebrowser(totherightofthepreview).

ENGINE_BLOCK.PRT第三十六頁(yè)，共99頁(yè)。Task1-2.PracticeusingSpin,Pan,andZoomwiththeENGINE_BLOCK.ModelOrientationCommandsSpin:

Rotatethemodelonthescreen.Pan:Movethemodelonthescreen.Zoom:Bringthemodeltowardsorawayfromyou.StandardOrientation:

An

orientationthatservesasafamiliarstartingpointforviewingthemodel.

Tospinthemodel,pressandholdthemiddlemousebuttonandmovethemouseinvariousdirections.ClickSavedViewListfromthemaintoolbar(topofthescreen)andselectStandardOrientation.Zoominandoutonthemodel:Placethe

mousecursoroveradesired

areaof

themodelPressCTRL,pressandholdthemiddlemousebutton,and

movethemousetowardsyoutozoomin.

PressCTRL,pressandholdthemiddlemousebutton,and

movethemouseawayfromyoutozoomout. Thelocationofthecursordeterminesthetargetareaforzooming. 第三十七頁(yè)，共99頁(yè)。Task1-2.PracticeusingSpin,Pan,andZoomwiththeENGINE_BLOCK.4 Ifyouhaveawheelmouse,tryzooming

byrollingthewheel:Rollthemousewheeltowardsyoutozoomin(withouttheCTRLkey).Rollthemousewheelawayfromyoutozoomout.ClickSavedViewListfromthemaintoolbar

andselectStandardOrientation.Pan

themodelaroundthescreen:PressSHIFT,pressandholdthemiddlemousebutton,and

movethemouseinvariousdirections.ClickSavedViewListfromthemaintoolbar

andselectStandardOrientation.YoucanpressCTRL+DasashortcuttotheStandardOrientation.第三十八頁(yè)，共99頁(yè)。Task1-3.Selectthemountingflange.SelectingwiththeMouseMovethemouseoverafeaturetohighlightit.

Clicktheleftmousebuttontomakeaselection.

Cyan(lightblue)highlightingindicatesanitemispre-selected.Redhighlightingindicatesanitemisselected.Onceafeatureisselected,edgesorsurfacesofthefeaturewillhighlight,andcouldbeselected.Highlightandselectafeatureasshowninthefollowingfigure:

PlacethecursorovertheEXTRUDE_2featuresoithighlightsincyan.SelecttheEXTRUDE_2featurebyclickingonit,soithighlightsinred.Zoomintomakeselectioneasier.第三十九頁(yè)，共99頁(yè)。HighlightingaFeatureClickonthebackgroundtode-selectthefeature.HighlightandselectEXTRUDE_2

again.Leavethefeatureselectedand

continue.

Task1-3.Selectthemountingflange.SelectingwiththeMouse第四十頁(yè)，共99頁(yè)。EditDefinitionandDragHandles

TheEditDefinitionoptionopensthedashboardforafeature,whereanydesiredchangestoafeaturecanbemade.

A'right-clickandhold'techniqueisusedtoaccesspopupmenus,whereasaquick'right-clickandrelease'willpre-highlightthenextfeaturebeneaththecursor.

Draghandlesaresmallwhitesquareslocatedontheyellowfeaturepreview.Task1-4.Editthedefinitionofthemountingflange(EXTRUDE_2)tomakeitthicker.WithEXTRUDE_2stillselected,right-clickandhold,andthenselectEditDefinition.Noticethatfeaturescreatedafterthisextrudearenotshownduringredefinition.Dragthedepthhandleonthemodel(whitesquareontheyellowpreview)from2to5,asshowninthefollowingfigure.Noticethedepthvaluehasupdatedinthedashboard(bottomofthescreen).第四十一頁(yè)，共99頁(yè)。EditDefinitionandDragHandles

Task1-4.Editthedefinitionofthemountingflange(EXTRUDE_2)tomakeitthicker.Redefiningafeature3. ClickCompleteFeaturefromtherightofthedashboard(bottomofthescreen).Themodelwilltakeafewmomentstoregeneratethemanyfeaturesthatcomeaftertheextrudeweredefined.Noticethatthischangehasalsoaffectedtheoppositeside,duetotheexistingParent/Childrelationships.第四十二頁(yè)，共99頁(yè)。EditingFeatureDimensionsYoucanEditafeaturetodisplayitsdimensions,andthenenternewvalues.

YouthenmustRegeneratethemodeltoupdatethechanges.Task1-5.Editthedimensionsofthecarburetormount,andthenundothechanges.Highlightandselecttheextrudefeatureasshowninthe followingfigure.

第四十三頁(yè)，共99頁(yè)。EditingFeatureDimensionsTask1-5.Editthedimensionsofthecarburetormount,andthenundothechanges.

Right-clickandhold,thenselectEdit.Thesectionanddimensionsofthefeatureappear.Double-clickonthe14.5dimension,type11.5,andpressENTER.ClickRegeneratefromthemaintoolbar(topofthescreen)toupdatethemodel.5.ClickUndofromthemaintoolbar(topofthescreen)to reversethelastedit.YoucanpressCTRL+

ZasashortcuttoUndo.第四十四頁(yè)，共99頁(yè)。CreatingaRoundRoundsallowyoutoaddorremovematerialfromamodelbyapplyingaradiustoan

edge.

Youcansimplyselectanedge,settheradius,andcompletethefeature.Task1-6.Createaroundonthecarburetormounttosmoothoffasharpedge.StarttheRoundTool

fromthefeaturetoolbar(rightofthescreen).Selecttheedgeshowninthefollowingfigure.a.Noticetheroundautomaticallyfollows

thetangentchainof edges.第四十五頁(yè)，共99頁(yè)。CreatingaRoundTask1-6.Createaroundonthecarburetormounttosmoothoffasharpedge.Drageitherradiushandle(whitesquareontheyellowpreview)toavalueof1.

ClickCompleteFeaturefromthedashboard(bottomofthescreen).a.NoticetheRoundfeatureisplacedatthebottomofthe modeltree(leftofthescreen)第四十六頁(yè)，共99頁(yè)。Undo/RedoYoucanusetheUndoandRedooptionstocorrectunintentionalactions.Task1-7.DeletetheroundandUndothedeletion.Withtheroundstillselected(highlightedinred),right-clickandhold,selectDelete,thenclickOK.ClickUndofromthemaintoolbartoreturnthefeaturetothemodel.ClickSavefromthemaintoolbarandclickOK.ClickFile>CloseWindow

.ModelsremaininsessionmemoryuntilErased.第四十七頁(yè)，共99頁(yè)。Exercise2:

CreatingPartModelsOverview-Inthisexerciseyouwilllearnbasicpartmodelingskillsby creating

threepartmodels: *PISTON_PIN.PRT *PISTON.PRT *CONNECTING_ROD.PRT第四十八頁(yè)，共99頁(yè)。CreatingPartModelsNewPartmodelsarecreatedfromadefaulttemplate,whichcontainsdefaultdatumplanesandacoordinatesystem.Defaultdatumplanesprovide3orthogonalplanesin3Dspacethatcanbeusedasinitialreferenceswhencreatingfeaturesonmodels.Alldefaulttemplatesinthisworkshoparesetuptousemillimeters.Task2-1.CreatethePISTON_PINmodelusingthedefaulttemplate.ClickNew

fromthemaintoolbarandselectPartastheType.TypePISTON_PINastheNameandpressENTER.ClickDatumAxesDatumPoints,andCoordinateSystems

fromthemaintoolbar(topofthescreen)todisabletheirdisplay.第四十九頁(yè)，共99頁(yè)。CreatingSketchesASketchisabasic2Dshapeusedtocreateafeature,andiscreatedonaplanarreference.Oncecreated,sketchesmaybeeasilyusedtocreate3Dfeatures.Task2-2.Createacircularsketchtobeusedforthemainbodyofthemodel.StarttheSketchToolfromthefeaturetoolbar(rightofthescreen).SelectdatumplaneFRONTfromthemodel,andclickSketchfromtheSketchdialogbox.ClickClosefromtheReferencesdialogbox.ClickDatumPlanesfromthemaintoolbar(topofthescreen)todisabletheirdisplay.第五十頁(yè)，共99頁(yè)。CreatingSketchesTask2-2.Createacircularsketchtobeusedforthemainbodyofthemodel.5. Sketchacircleasshowninthefollowingfigure:ClickCirclefromthesketchertoolbar(rightofthescreen).Positionthecursortosnapattheintersectionofthedatumplanes.c Clickandreleasetoplacethecirclecenter,movethemouseoutward,thenclickandreleaseagain.d Noticethatadimensionisautomaticallycreated.e ClickSelect

Itemsfromthesketchertoolbar(rightofthescreen)toallowitemstobeselected.f Double-clickthediameterdimensionvalue,

type5,

andpressENTER.第五十一頁(yè)，共99頁(yè)。CreatingSketchescontinueTask2-2.Createacircularsketchtobeusedforthemainbodyofthemodel.6 ClickCompleteSketch

fromthesketchertoolbar(rightofthescreen).ClickSavedViewListfromthemaintoolbarandselectStandardOrientation.8 ClickDatumPlanesfromthemaintoolbartoenabletheirdisplay.第五十二頁(yè)，共99頁(yè)。UsingtheExtrudeToolTheExtrudetoolallowsyoutotakeasketchandlinearlyextrudeittocreateafeature.Youcanaddmaterial(protrusion)orremovematerial(cut)whenusingtheExtrudetool.Task2-4.CreatethePISTON.PRT,andcreatethefirstSketch..Withthesketchstillselected(highlightedinred),createanExtrudefeatureasshowninthefollowingfigure:StarttheExtrudeToolfromthefeaturetoolbar(rightofthescreen).Dragthedepthhandle(whitesquareontheyellowpreview)to4.Clickthe

blackarrowontheDepthOptions

Flyout

inthedashboard(bottomofthescreen)andselectBothSides.第五十三頁(yè)，共99頁(yè)。UsingtheExtrudeToolTask2-4.CreatethePISTON.PRT,andcreatethefirstSketch..Type20inthedashboardandforthedepthandpressENTER.e. ClickRefitfromthemaintoolbar(topofthescreen).f. ClickCompleteFeaturefromthedashboard(bottomofthescreen).ClickSavefromthemaintoolbarandclickOK.ClickFile>CloseWindow.第五十四頁(yè)，共99頁(yè)。CreatingthePISTONThePISTONalsostartsoffusingacircularsketch,butitisplacedonadifferentplane.Task2-4.CreatethePISTON.PRT,andcreatethefirstSketch.ClickNewfromthemaintoolbarandselectPartastheType.TypePISTONastheNameandpressENTER.Anewpartmodeliscreatedfromthedefaulttemplate.StarttheSketchToolfromthefeaturetoolbar(rightofthescreen).SelectdatumplaneTOPfromthemodel,andclickSketchfromtheSketchdialogbox.Sketchacircleasshowninthefollowingfigure:ClickClosefromtheReferencesdialogbox.ClickDatumPlanesfromthemaintoolbar(topofthescreen)todisabletheirdisplay.第五十五頁(yè)，共99頁(yè)。CreatingthePISTONTask2-4.CreatethePISTON.PRT,andcreatethefirstSketch.ClickCirclefromthesketchertoolbar(rightofthescreen).Clickandreleasetoplacethecirclecenter,movethemouseoutward,thenclickandreleaseagain.ClickSelect

Itemsfromthesketchertoolbartoallowitemstobeselected.Double-clickthediameterdimension,type21,andpressENTER.ClickCompleteSketch

fromthesketchertoolbar.ClickSavedViewListfromthemaintoolbarandselectStandardOrientation.ClickDatumPlanesfromthemaintoolbartoenabletheirdisplay.第五十六頁(yè)，共99頁(yè)。Task2-5.UsetheprevioussketchtocreatethefirstExtrudefeature.ChangingtheDepthDirectionYoucanflipthefeaturetothe

othersideofitssketchingplanebyusingtheChangeDepthDirectionoption.Withthesketchstillselected,createanExtrudefeatureasshowninthefollowingfigure:StarttheExtrudeToolfromthefeaturetoolbar(rightofthescreen).Double-clickonthedepthvalue,

type18.5,andpressENTER.ClickChangeDepthDirectioninthedashboard(bottomofthescreen)toflipthedirectionoffeaturecreationdownward.ClickCompleteFeaturefromthedashboard.Thesnappingintervalfordraghandlesiscurrentlysetto1mm.第五十七頁(yè)，共99頁(yè)。Task2-5.UsetheprevioussketchtocreatethefirstExtrudefeature.ChangingtheDepthDirection第五十八頁(yè)，共99頁(yè)。CreatingaGroupofFeaturesThenextsolidfeaturetobecreatedisanExtrudedCuttohollowoutthePISTON.

Inordertocapturethedesireddimensioningschemeforthecut,itssketchwillbeplacedonadatumplaneoffsetfromthetopsurfaceofthemodel.

WewillstarttheExtrudetoolandPauseit.

Wewillthencreatethe

datumplaneandthe

sketch.

WhentheExtrudetoolisResumedandcompleted,

thesystemautomaticallycreatesa

Groupinthemodeltree.

Agroupallowsustoeditandmanipulateseveralfeaturesasone.Task2-6.StarttheExtrudetoolandthencreateadatumplane.StarttheExtrudeToolfromthefeaturetoolbar(rightofthescreen).ClickPauseFeature

fromtherightofthedashboard.

(bottomofthescreen)

Noticethedashboardgrays-out,indicatingitispaused.StarttheDatumPlaneTool

fromthefeaturetoolbar(rightofthescreen)..第五十九頁(yè)，共99頁(yè)。CreatingaGroupofFeaturesTask2-6.StarttheExtrudetoolandthencreateadatumplane.SelectdatumplaneTOPfromthemodel,anddragtheoffsethandledownwardto2.ClickOKfromtheDatumPlanedialogbox.第六十頁(yè)，共99頁(yè)。UsingCenterlinesinaSketchCenterlinespromotesymmetrywhensketching.

Inthisexample,wewantarectangletobesketchedsymmetricallyabouttheverticalandhorizontalreferences.

Centerlinesdisplayasayellowdashedline.

Task2-7.Sketchonthepreviousdatumplane.

Beginbysketchingasymmetricrectangle.Withthedatumplanestillselected,starttheSketchToolfromthefeaturetoolbar.NoticethatdatumplaneDTM1isautomaticallyselectedastheSketchingPlane.ClickSketchfromtheSketchdialogbox.ClickClosefromtheReferencesdialogbox.ClickDatumPlanesfromthemaintoolbar(topofthescreen)todisabletheirdisplay.ClickNoHiddenfromthemaintoolbar.第六十一頁(yè)，共99頁(yè)。UsingCenterlinesinaSketchTask2-7.Sketchonthepreviousdatumplane.

Beginbysketchingasymmetricrectangle.f Noticethattherearetwotandashedlines,thesearesketcherreferences.

Sketchedgeometrywillsnaptothesereferences.Sketchcenterlinesandarectangleasshowninthefollowingfigure:Clickthe

blackarrowontheLineTypes

Flyout

inthesketchertoolbar

(rightofthescreen),andselect

Centerline.Clicktwolocationsontheverticalsketcherreference

tosketchaverticalcenterlineSketchanothercenterlineonthehorizontalsketcherreference,asshownontheleft.ClickRectanglefromthesketchertoolbar(rightofthescreen).第六十二頁(yè)，共99頁(yè)。UsingCenterlinesinaSketchTask2-7.Sketchonthepreviousdatumplane.

Beginbysketchingasymmetricrectangle.Clickandreleasetoselecta

locationfortheupperleftcorneroftherectangle.Allowingtherectangletosnaptosymmetry,clickandreleasetoselectaAlwaysusea'click-and-release‘,'click-and-release'techniquewhensketchinggeometry,asopposedtoholdingdowntheleftmousebuttonand'dragging'.第六十三頁(yè)，共99頁(yè)。ClickArcfromthesketchertoolbar(rightofthescreen).

Clickandreleaseontheupperrightvertexoftherectangletostartthearc.Movethecursorrightwardoutofthegreenquadrantsymbol

tocontinuethearc.Clickandreleaseonthelowerrightvertexoftherectangletocompletethearc.WithArcstilldepressed,sketchasimilararc

ontheleftoftherectangle

(thistime,movethecursorleftwardoutofthegreenquadrantsymbol).Task2-8.Continuethesketchtocreateanovalshape.

Beginbysketchingtangentarcsusingtherectangleasaguide.SketchingArcsTheArctoolcancreateboth3-pointandtangent-endarcs.

Inthistask,wewillbecreatingaTangentArc.第六十四頁(yè)，共99頁(yè)。SketchingArcsAlwaysusea'click-and-release',

'click-and-release'techniquewhensketchinggeometry,asopposedtoholdingdowntheleftmousebuttonand'dragging'.Task2-8.Continuethesketchtocreateanovalshape.

Beginbysketchingtangentarcsusingtherectangleasaguide.第六十五頁(yè)，共99頁(yè)。CreatingDimensionsManydifferentdimensiontypesarecreatedwiththeDimensiontool.

Tocreateadimension,selectitem(s)tobedimensionedandthenmiddle-clicktolocatethedimensionvalueTask2-9.Completetheoval-shapedsketchbycreatingdimensions.ClickDimensionfromthesketchertoolbar(rightofthescreen).Selecteacharc,positionthecursorabovethesketch,andmiddle-clicktoplacethedimension.SelectHorizfromtheDimOrientationdialogboxthatappearsandclickAccept.WithDimensionstilldepressed,selectthetopandbottomlines.Positionthecursortotherightofthesketch,andmiddle-clicktoplacethedimension.第六十六頁(yè)，共99頁(yè)。CreatingDimensionsTask2-9.Completetheoval-shapedsketchbycreatingdimensions.Middle-clicktostopsketchingandtoallowitemstobeselected.NoticethatSelect

Itemsisnowdepressed.Double-clickonthehorizontaldimension,type18,andpressENTER.Double-clickonthehorizontaldimension,type12.5,andpressENTER.第六十七頁(yè)，共99頁(yè)。Task2-9.Completetheoval-shapedsketchbycreatingdimensions.CreatingDimensionsClickCompleteSketchfromthesketchertoolbar.ClickSavedViewListfromthemaintoolbarandselectStandardOrientation.ClickDatumPlanesfromthemaintoolbartoenabletheirdisplay.ClickShading

fromthemaintoolbar.第六十八頁(yè)，共99頁(yè)。CompletingtheGroupoffeaturesNowthatthedatumplaneandsketchhavebeencreated,wewillResumeandcompletetheExtrudefeature,creatinganovalcutthathollowsoutthePISTON.Task2-10.CompletetheExtrudedcutusingtheprevioussketch.Withthesketchstillselected,completetheExtrudefeatureasshowninthefollowingfigure:ClickResumeFeaturefromthedashboard.Clicktheyellowdepthdirectionarrowonthemodeltoflipthedirectiondownward.Clickthe

blackarrowontheDepthOptions

Flyout

inthedashboard

andselect

ThroughAll.ClickRemoveMaterialfromthedashboard,andthenclick

CompleteFeature.Pressandholdthemiddlemousebutton

tospinthemodel,andviewthecutontheunderside.第六十九頁(yè)，共99頁(yè)。CompletingtheGroupoffeaturesTask2-10.CompletetheExtrudedcutusingtheprevioussketch.Manyfeatureoperationscanbedonebyrightclick