Computer-aided Design Slides Prepared by Junwei Zhang 8 May 2002.

Computer-aided DesignComputer-aided Design

Slides Prepared by Slides Prepared by

Junwei ZhangJunwei Zhang

8 May 20028 May 2002

OverviewOverview

• What is Computer-aided Design?What is Computer-aided Design?• Will CAD work for me?Will CAD work for me?• How does it work?How does it work?• Advantages and DisadvantagesAdvantages and Disadvantages• Future TrendsFuture Trends• Rollerblade Inc. Rollerblade Inc. • Six ways to choose the right CAD for youSix ways to choose the right CAD for you• SummarySummary

What Is Computer-aided What Is Computer-aided Design(CAD)Design(CAD)

• A software system that uses computer A software system that uses computer graphics to assist in the creation, graphics to assist in the creation, modification, and analysis of a design.modification, and analysis of a design.

What Is Computer-aided Design What Is Computer-aided Design (CAD Retrospective)(CAD Retrospective)

• 1982 Solid modeling has proliferated to CAD 1982 Solid modeling has proliferated to CAD systems systems

• 1983 3D developed in Sweden1983 3D developed in Sweden• 1986 Autodesk's AutoCAD is the most popular 1986 Autodesk's AutoCAD is the most popular

microcomputer design programmicrocomputer design program• 1989 NASA develops high-end data 1989 NASA develops high-end data

visualization programsvisualization programs


• 1990 Manufacturers take advantage of NC 1990 Manufacturers take advantage of NC simulation software to graphically depict tool simulation software to graphically depict tool paths to detect machining errors before actual paths to detect machining errors before actual metal cutting commencesmetal cutting commences

• 1998 Chrysler becomes the first automaker to 1998 Chrysler becomes the first automaker to adopt a fully digital, "Cyber-synthesis" process.adopt a fully digital, "Cyber-synthesis" process.


• 1998 Mechanical CAD vendors battle for a 1998 Mechanical CAD vendors battle for a share of the midrange marketshare of the midrange market

• 2000 Moving design engineering from the 2000 Moving design engineering from the desktop to the Webdesktop to the Web

• 2001 The same CAD data used to design cars 2001 The same CAD data used to design cars is also used to market themis also used to market them

Will CAD work for me?Will CAD work for me?

• Speeding up the prototype testing Speeding up the prototype testing process, and consequently, shortening process, and consequently, shortening the product design cycle significantly?the product design cycle significantly?

• Taking advantage of 3D modeling tools Taking advantage of 3D modeling tools to translate visions into realities?to translate visions into realities?

Will CAD work for me?Will CAD work for me?

• To best describe a product in order to To best describe a product in order to gain approval from marketing?gain approval from marketing?

• Provide instructions to manufacturing?Provide instructions to manufacturing?

How Does It Work?How Does It Work?

• Geometric modeling Geometric modeling • Automated drafting and documentationAutomated drafting and documentation• Engineering analysis and design analysis Engineering analysis and design analysis


• Geometric modelingGeometric modeling– Uses basic lines, curves, and shapes to Uses basic lines, curves, and shapes to

generate the geometry and topology of a generate the geometry and topology of a partpart

– 2D2DTechnical drawing Technical drawing General-Purpose drafting General-Purpose drafting

– 3D 3D Difficult to masterDifficult to masterFreely rotate and zoom a modelFreely rotate and zoom a model


• Automated drafting and documentationAutomated drafting and documentation– Produces engineering drawings directly from Produces engineering drawings directly from

the CAD databasethe CAD database– More advanced documentation merges text More advanced documentation merges text

and graphics to produce assembly drawings, and graphics to produce assembly drawings, bills of material, instruction manuals and bills of material, instruction manuals and reports, parts catalogs, and sales brochuresreports, parts catalogs, and sales brochures


• Engineering analysis and design Engineering analysis and design analysis analysis – Is also called computer-aided Is also called computer-aided

engineeringengineering– Tests and analyzes designs on the Tests and analyzes designs on the

computer screen computer screen

AdvantagesAdvantages

• Reduce the lead time for new product Reduce the lead time for new product introductionintroduction

• Products can be tested more quicklyProducts can be tested more quickly• Costly mistakes in design or production Costly mistakes in design or production

can be avoidedcan be avoided

AdvantagesAdvantages

• Time to manufacture can be reducedTime to manufacture can be reduced• Documentation can be printed in various Documentation can be printed in various

forms for multiple usersforms for multiple users• The quality of designs and the products The quality of designs and the products

manufactured from them is improvedmanufactured from them is improved

DisadvantagesDisadvantages

• IncompatibilityIncompatibility• Complex Surfaces Complex Surfaces

Future TrendsFuture Trends

• Design software is getting easier to Design software is getting easier to useuse

• National CAD standardNational CAD standard

Rollerblade Inc.Rollerblade Inc.

• BackgroundBackground– headquartered in headquartered in

Minnetonka, Minnetonka, MinnesotaMinnesota

– founder and founder and market leader of market leader of the in-line skating the in-line skating industryindustry

Rollerblade Inc. Rollerblade Inc.

• ImplementationImplementation– Software: Vellum, Alias Studio, Alias Software: Vellum, Alias Studio, Alias

StudioPaint 3D, Pro/Engineer StudioPaint 3D, Pro/Engineer – speed up the prototype testing stage of the speed up the prototype testing stage of the

design development processdesign development process– skate can be produced not only faster, but skate can be produced not only faster, but

more cheaply as well. more cheaply as well.

Six ways to choose the Six ways to choose the right CAD for youright CAD for you

• Check around to see what your co-workers are Check around to see what your co-workers are usingusing

• Do not buy based on priceDo not buy based on price• Define how often you will use the software. Define how often you will use the software. • Narrow software selectionsNarrow software selections• Check out vendor demosCheck out vendor demos• After the demonstrations, narrow the choice After the demonstrations, narrow the choice

down to two or threedown to two or three

ExerciseExercise

• Divide into groupsDivide into groups• List company designing problemsList company designing problems

– Compare to brainstorming questionsCompare to brainstorming questions• How are problems solved by CAD?How are problems solved by CAD?

SummarySummary

• Time-savingTime-saving• Efficient design toolEfficient design tool• Improve product qualityImprove product quality• Communicate through the webCommunicate through the web

BibliographyBibliography

1.1. Russell, Roberta Russell, Roberta Operations ManagementOperations Management

Prentice Hall, Inc. 2000Prentice Hall, Inc. 2000

2.2. Rowell, Amy “Designing To Win” Rowell, Amy “Designing To Win” Computer Graphics Computer Graphics WorldWorld March, 1997 March, 1997

3.3. Stevens, Tim “The cost of CAD Incompatibility” Stevens, Tim “The cost of CAD Incompatibility” www.IndustryWeek.com June 11, 2001www.IndustryWeek.com June 11, 2001

4.4. www.bdcmag.comwww.bdcmag.com

5.5. Meyer, Ann “TRW Faces CAD Translation Nightmares” Meyer, Ann “TRW Faces CAD Translation Nightmares” Computer Graphics WorldComputer Graphics World June, 1997 June, 1997

BibliographyBibliography6.6. Rowell, Amy “The Challenge of Cad Interoperability” Rowell, Amy “The Challenge of Cad Interoperability” Computer Graphics Computer Graphics

WorldWorld June, 1997 June, 19977.7. Smith, Susan “The Challenges of Complex Surfaces” Smith, Susan “The Challenges of Complex Surfaces” Computer Computer

Graphics WorldGraphics World November, 1996 November, 19968.8. Potter,Caren D. “Engineering on the Internet” Potter,Caren D. “Engineering on the Internet” Computer Graphics WorldComputer Graphics World

August, 1996August, 19969.9. Rowell, Amy “The 2D Cad Option” Rowell, Amy “The 2D Cad Option” Computer Graphics WorldComputer Graphics World August, August,

1996199610.10. Hudspeth, Michael “Planning the move to 3D design” Hudspeth, Michael “Planning the move to 3D design” Machine Design Machine Design

Oct 25, 2001Oct 25, 2001

Computer-aided Design Slides Prepared by Junwei Zhang 8 May 2002.

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