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ENGR 125COMPUTER-AIDED DESIGN ANDFABRICATIONWHY ARE YOU HERE?Required CourseInstructorCAD modeling is a means to an endEngineering graphics is a very useful skillScott Kessler, P.E., Ph.D., ASNT Level IIIemail: mesa.edu/ skesslerCAD AssistantTom Martensemail: tmartens@mavs.coloradomesa.eduMountain Bike Rear ShockMatt BuskerFall 2010CAD/FabTEXTBOOKSPERSONAL INFOConsulting Engineer for 25 years- Required text, tutorials and assignments:Howard, W.E. & Musto, J.C., Solid Modeling usingSolidWorks 2011, McGraw-Hill, 2011.Forensic Engineering (Failure Analysis)Finite Element AnalysisEngineering Design- Ebook for reading assignments and selectedhomework:Engineering Graphics, Selected chapters from Bertoline& Wiebe, Fundamentals of Graphics Communication, 5thEd., McGraw-Hill, 2007.Mechanical TestingNondestructive Testing3Course IntroductionCAD/FabCourse Introduction4 Available online (see web site for instructions)http://www.kestek.comCAD/FabCourse Introduction2SPRING 20121

COURSEWORKQUIZZESReading AssignmentsTutorials are your opportunity to learn by doingQuizzes are given at the instructors discretion to testknowledge of engineering graphics concepts, especiallyGD&TAssignments will be posted on the course web siteTutorial/Assignments to be posted on k: drive, account for50% of grade10% of your grade (all 10% will be awarded if quizzes are notgiven)Create CAD model of an assembly (40% of grade)Lecture slides posted on course web site: www.coloradomesa.edu/ skesslerPrint out and bring to class if desiredProvide big-picture conceptsUse of the 3D modeling conceptsMust be an assembly of at least three componentsDocumentation Design process, manufacturing processes, geometricdimensioning and tolerancing (GD&T), design formanufacturability, etc. 7Quiz hintsSolidWorks examples and tipsCourse IntroductionCourse IntroductionFINAL PROJECTLECTURESCAD/FabCAD/Fab6Course IntroductionCAD/FabPart drawingsAssembly drawingAnimation/Exploded View3 to 5 minute presentation required (i.e., don’tpresent, don’t pass the course)Course Introduction8CAD/Fab5Assignments will be given due dates. Late submissions will begiven partial credit of up to 50% one class period after due dateat the instructors discretion.2

LEARNING OBJECTIVESLEARNING OBJECTIVES (CONT)At the completion of this course students should:3. Be able to create multi-view, auxiliary and sectiondrawings from 3-D solid models2. Be able to construct 3-D solid models on a modern CAD systemCAD/FabCourse Introduction9 Create 3-D solid models of complex objects given a multi-viewrepresentation Create solid models of individual parts Create reference geometry features (planes, axes) Create solid features using sweeping and lofting operations Measure properties of 3-D CAD models Create assemblies of CAD parts with appropriate mating relationshipsCAD/FabCourse IntroductionLEARNING OBJECTIVES (CONT)LEARNING OBJECTIVES (CONT)4. Create dimensioned drawings from 3-D solid models6. Demonstrate a basic understanding of basicmanufacturing processes Understand the basic terminology associated with dimensioning practiceDemonstrate size, location, and coordinate dimensioningCreate dimensioned drawings from 3-D solid modelsCreate complete working drawings including assembly and detaileddrawings for a “real-life” object 5. Be able to apply geometric dimensioning and tolerancing (GD&T)CAD/FabCourse Introduction11 Understand the overall concept of GD&T Be able to recognize GD&T dimensioning on an engineering drawing Be able to determine maximum material condition (MMC) and itsimplications Calculate bonus tolerance allowances as features deviate from MMC Be able to recognize and specify GD&T datums Be able to visualize tolerance zones as specified in GD&T Be able to create GD&T control features on an engineering drawingDescribe basic machining processesDescribe casting and forming processesDescribe basic sheet metal operationsCreate a prototype using a contemporary rapid prototypingprocessCAD/FabCourse Introduction12 Generate hand-drawn multi-view technical sketches Create a multi-view sketch given an isometric pictorial and vice versa10 Know the principal planes of projection and the principalviews Be able to distinguish between first-angle and third-angleprojection Be able to create hidden lines, center lines, etc. based ongraphics conventions Create multi-view drawings from 3-D solid models on a CADsystem Be able to represent typical features: e.g. holes, threads,chamfers, and fillets Create multi-view drawings given isometric pictorials ofcomplex objects using 3-D solid models Create auxiliary views automatically from 3-D solid models Be able to generate appropriate section views1. Know elements of sketching and orthographic projection theory3

SAMPLE INDIVIDUAL PROJECTSSAMPLE INDIVIDUALPROJECTSClimbing CamChris CarterCVT TransmissionEric EasonSpinning Reel - Nick MarsigliaLightning SYXBrandon WheelerCAD/Fab14Electric GuitarSteve SzabadosCourse IntroductionGRAPHICS LANGUAGEACADEMIC HONESTYIt is expected that each student will do his/her own workGraphics is the language of designAcceptable: Collaboration for the purpose of learning theconcepts, SolidWorks, etc.It allows clear communication ofUnacceptable: Copying filesdesign intentACADEMIC DISHONESTY WILL BE DEALT WITH HARSHLYCourse IntroductionCAD/FabCourse Introduction16CAD/Fab15It fueled the industrial revolution4

TWO TYPES OF GRAPHICSCOURSE SKILLSThe old-fashioned wayHand drawing Sketching by hand All you need is a pencil and paper Ability to “read” engineering drawingsBasic knowledge of Geometric Dimensioning and Tolerancing(GD&T) Chalk and blackboard Marker and white boardComputer-aided design (CAD) Parts Assemblies DrawingsCourse IntroductionIntro to Simulation finite element analysis (FEA) computational fluid dynamics (CFD)CAD/FabHAND SKETCHING IS STILLIMPORTANT!18CAD/FabSolidWorks CAD iaSolidedgeand many others 17 Course IntroductionCOMPUTER-AIDED DESIGN PROCESSOptimizeCAD ModelDOCUMENTANALYSISStressMotionHeat TransferFluid FlowPhotoWorks RenderingCourse IntroductionCAD/FabCourse nishetcEngineering Drawing20CAD/Fab19MANUFACTUREMachiningRapid Prototyping: 3D printer Laser cutter Stereolithography5

SOLIDWORKS CHARACTERISTICSSOME SOLIDWORKS sedParametricHistory-basedCourse IntroductionSOME SOLIDWORKS FEATURESCourse IntroductionSOME SOLIDWORKS FEATURESExtrude trude cutExtrudeboss/baseCourse IntroductionCAD/FabCourse Introduction24CAD/Fab23Circularpattern6

SOME SOLIDWORKS FEATURESSOME SOLIDWORKS FEATURESFilletFilletExtrude cutExtrudeboss/baseExtrude cutExtrudeboss/baseChamferCourse IntroductionSOME SOLIDWORKS FEATURESDomeCourse IntroductionMORE SOLIDWORKS FEATURESFilletSweepExtrude 25CircularpatternProfileHelical sweep pathLoftChamferCourse IntroductionCAD/FabCourse Introduction28ShellCAD/Fab27Circularpattern7

PARAMETRICCONSTRAINT BASEDCONSTRAINT-BASEThese dimensions are allparameters that specifythe highlighted featuresLines constrainedto be verticalCenter of circle constrainedto mid-point of diagonalLines constrainedto be equal lengthChanging the value ofthe parameters willautomatically change themodelLines constrainedto be horizontalCourse IntroductionHISTORY-BASEDCAD/FabCourse Introduction30CAD/Fab29Design intent remains intactas the part is modifiedHISTORY-BASEDFeatureManagerDesign TreeCan “roll back” part’sdesign history tochange the order offeature creation, andhence the modelCourse IntroductionCAD/FabCourse Introduction32CAD/Fab31Hint: Rename featuresas you go to make themodel easier to “read”in the future!8

ASSOCIATIVESOLIDWORKS FILESModel 2Model m.edrwCAD/FabPART FILESCourse IntroductionASSEMBLIES – PARTS MATEDSolidWorks parts are solid objects, no matter how complexDisjoint parts are OKCAD/FabCourse IntroductionWireframe modelParts can be movedrelative to each otherSections add clarity35Shaded model34Course IntroductionClosedCAD/FabCourse IntroductionOpen36CAD/FabDrawing 233Drawing 19

Course IntroductionSolidWorks eDrawing Self-contained file Ability to zoom, pan, rotateCAD/FabCourse Introduction38CAD/Fab37SolidWorks drawing file10

CAD/Fab Course Introduction 33 Model 1 Model 2 Drawing 1 Drawing 2 SOLIDWORKS FILES CAD/Fab Course Introduction 34 Part .sldprt Assembly .sldasm Drawing .slddrw .eprt .easm .edrw CAD/Fab Course Introduction 35 Sections add clarity SolidWorks parts are solid objects, no matter how complex