cad vs mechanical drawing , cad cam
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CADCAD vsvs Mechanical DrawingMechanical Drawing
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ObjectivesObjectives
To understand engineering design processTo understand engineering design process
To understand the principles of computerTo understand the principles of computer--aidedaideddrafting (CAD)drafting (CAD)
To understand CAD componentsTo understand CAD components
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What is Modern Graphics Communication?
a universal language
– Standards organizations like ANSI (American NationalStandards Institute) and ISO (International Standards
Organization) publish standards detailing how drawingsshould be created so they can be interpreted universally.
the primary medium for communicating and
developing design concepts
mechanical engineering design is mostly
based on solid modeling.
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The Engineering Design Process
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Freehand Sketching
Freehand sketching is used in engineeringgraphics to quickly communicate your ideas or
designs.
Drawing instruments and CAD are not alwaysavailable, especially during field work
Freehand sketching is not sloppy sketching!Your sketches need to be interpreted by others
on your design team
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Example Freehand Sketch for Concept Development
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CAD/ CAM/ CAE etc.CAD/ CAM/ CAE etc.
CAD = ComputerCAD = Computer--
aided Design & aided Design &
DraftingDrafting
CAM = ComputerCAM = Computer--aidedaided
ManufacturingManufacturing
CAE = ComputerCAE = Computer --
assistedassisted
EngineeringEngineering
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CAD (cont.)CAD (cont.)
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CAD (cont.)CAD (cont.)
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Parts of a CAD SystemCPUCPU
InputInputOutputOutput
Operating SystemOperating SystemSoftwareSoftware
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CPUCentral Processing UnitCentral Processing Unit
receives data andreceives data andmanages and controlsmanages and controls
the functions of thethe functions of the
CAD system.CAD system.
It isIt is analagousanalagous to ato a
human’s brain, whichhuman’s brain, whichinterprets data andinterprets data and
controls motorcontrols motor
functions.functions.
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Input Devices
MouseMouse
DigitizerDigitizer
TrackballTrackball
Light PenLight Pen TouchTouch
ScreenScreen
KeyboardKeyboard
VoiceVoice
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CAD SystemCAD System – – Input DeviceInput Device --TabletTablet
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CAD SystemCAD System – – Input DeviceInput Device -- ScannerScanner
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CAD SystemCAD System – – Input DeviceInput Device – – Light penLight pen
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Output Devices
MonitorsMonitors
PrintersPrinters PlottersPlotters
Rapid PrototypingRapid Prototyping
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Output Devices - Plotter
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Output Devices - Plotter
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Output Devices - Printer
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Storage Devices Fixed disk drive or hardFixed disk drive or hard
drive (2drive (2--9 GB common)9 GB common) Floppy disk drive (1.44Floppy disk drive (1.44
MB)MB)
Zip drives (100 MB)Zip drives (100 MB)
CDCD--ROM drives (800ROM drives (800
MB)MB) Optical drives (1 GB)Optical drives (1 GB)
Magnetic tape (1+ GB)Magnetic tape (1+ GB)
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CADCAD SoftwaresSoftwares
Common basic features:Common basic features:
–– Commands to generate geometryCommands to generate geometry–– Functions for controlling viewsFunctions for controlling views
–– Modifiers for changing drawingModifiers for changing drawing
geometrygeometry
–– Annotation commands for addingAnnotation commands for adding
text, dimensions, and notestext, dimensions, and notesSelect a system that will meet yourSelect a system that will meet your
needs.needs.
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CADCAD SoftwaresSoftwares
SolidWorksSolidWorks
Ideas Master SeriesIdeas Master Series
Mechanical Desktop by AutoCADMechanical Desktop by AutoCAD
CAD/DAMCAD/DAM
ProPro--engineerengineer
CatiaCatia
etc.etc.
CAD A bl
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CAD AssemblyCAD Assembly
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Shapes of SolidShapes of Solid PrismPrism
PyramidPyramid
CylinderCylinder ConeCone
SphereSphere
TorusTorus
Oblate andOblate and prolateprolate ellipsoidellipsoid
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Shapes of SolidShapes of Solid – – (cont.)(cont.)
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Solid ModelingSolid Modeling
ExtrusionExtrusion
RevolutionRevolution
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ExampleExample