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CAD HARDWARE

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TYPES OF SYSTEMS

• (1) Mainframe Based Systems

 – A large central computer; processes most

commands and also stores; whereas dumb terminals or workstations are at the hands of

e es gners

 – Examples are systems provided by• c onne oug as n ormat on ystems roup

• Computervision Corporation

 – necessary

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.

•

 – Essentially the same mainframe-based,

 – Design and drafting terminals are also fewer

 system 

 – Vision Corp’s “Designer’s Series” and “CDS4000”.

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.

•

 – Nothing but PC based

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TYPES OF SYSTEMS (contd.)

 

 – or s a on o en as n x as .

 – CAD workstation is a computer system with its

software and visualization/display

 – From memory point of view, “work station”

attached to some mainframe or minicomputers stem for storin CAD models

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CAD HARDWARE SYSTEMS EVALUATION CRITERIA

• Criteria should be based on the followingrequirements

 – Cost matters

 – enc mar s c osen o es sys em per ormanceand capabilities

 – -computers

 – Pros ective de artments that lan to use the

system

 – Credibility of the CAD suppliers

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Normally Followed Criteria• System Considerations

 –  ar ware –  Software

• Geometric Modeling Considerations –  epresen a on ec n ques

 –  Coordinate Systems and Inputs –  Modeling Entities –    –  Graphics Standards Support

• Design Documentation –   

• Applications –  Assemblies or Model Merging –    –  Manufacturing Applications –  Programming Languages Supported

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INPUT DEVICES

• Keyboards

• Light-pens

• Digitizing tablets•

• Joysticks, Trackballs and Thumbwheels

Non mainstream devices:

• Touch devices

•

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OUTPUT DEVICES• rap cs sp ays

•

•

•

• AD D Ex h n F rm Fil

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Graphics Displays

• Electron Beam is used

• Most widely used; needs a lot of space

• ree types:

 –  Refresh Display

 –  Direct View Storage Tube (DVST)

 –  as er sp ay

» Pixel values and Look Up Table (LUT)

• Laser flat panel displays – a laser beam isused to trace the image on a film; compact

• Plasma based display - Liquid Crystal

are used to generate the images; compact

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•

• Electrostatic Plotters

• ar copy n ts

• Inkjet Plotters• Black and White Printers

•

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