CAD vs Mechanical Drawing , cad cam

8/7/2019 CAD vs Mechanical Drawing , cad cam

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CADCAD vsvs Mechanical DrawingMechanical Drawing



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



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.



The Engineering Design Process



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



Example Freehand Sketch for Concept Development



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





CAD (cont.)CAD (cont.)



CAD (cont.)CAD (cont.)



Parts of a CAD SystemCPUCPU

InputInputOutputOutput

Operating SystemOperating SystemSoftwareSoftware



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.



Input Devices

MouseMouse

DigitizerDigitizer

TrackballTrackball

Light PenLight Pen TouchTouch

ScreenScreen

KeyboardKeyboard

VoiceVoice



CAD SystemCAD System – – Input DeviceInput Device --TabletTablet



CAD SystemCAD System – – Input DeviceInput Device -- ScannerScanner





CAD SystemCAD System – – Input DeviceInput Device – – Light penLight pen



Output Devices

MonitorsMonitors

PrintersPrinters PlottersPlotters

Rapid PrototypingRapid Prototyping



Output Devices - Plotter



Output Devices - Plotter



Output Devices - Printer



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)



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.



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



CAD AssemblyCAD Assembly



Shapes of SolidShapes of Solid PrismPrism

PyramidPyramid

CylinderCylinder ConeCone

SphereSphere

TorusTorus

Oblate andOblate and prolateprolate ellipsoidellipsoid



Shapes of SolidShapes of Solid – – (cont.)(cont.)



Solid ModelingSolid Modeling

ExtrusionExtrusion

RevolutionRevolution



ExampleExample

Documents

CAD vs Mechanical Drawing , cad cam