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Advantages & Disadvantages of CAD




10/03/03       Designed by Barry Forbes
Computer Knowledge

   You will need to know about a number
    of things to do with computers:
     – Advantages & disadvantages of CAD
       (Computer Aided Drawing) and CAG
       (Computer Aided Graphics).
     – Input & Output devices and their uses.
     – Some commands and techniques of using
       2D & 3D CAD packages.

10/03/03          Designed by Barry Forbes
Advantages of CAD

   Reduced storage space required.
   Previously, paper drawings would have
    required whole rooms to store the
    drawings for a building.
   Now this information can be stored on a
    single disk.


10/03/03         Designed by Barry Forbes
Advantages of CAD

   Corrections can be made easily.
   Before, whole drawings may have had
    to be reproduced on paper if a mistake
    has been made.
   Now a single line is deleted and
    redrawn in the correct place.


10/03/03         Designed by Barry Forbes
Advantages of CAD

   Repetitive parts of the drawing can be
    saved and imported as part of a
    “drawing library”.
   Paper drawings require objects to be
    redrawn each time manually which is
    time consuming.
   Being able to call the parts in from a
    library saves the user time.
10/03/03         Designed by Barry Forbes
Advantages of CAD

   It takes less time to produce drawings
    using CAD systems than traditional
    manual drawing methods.




10/03/03         Designed by Barry Forbes
Advantages of CAD

   Drawings offices often produce their
    drawings using a standard layout so
    that people can immediately identify the
    drawings as belonging to that particular
    company.
   Templates can be set up on a computer
    to make this easier.

10/03/03         Designed by Barry Forbes
Advantages of CAD

   No matter what size of drawing is being
    produced CAD systems can be used to
    produce them accurately.
   Grid Snap, Zoom and Attach commands
    are 3 examples of methods of producing
    accurate drawings easily.


10/03/03        Designed by Barry Forbes
Advantages of CAD

   CAD systems can be linked with CAM
    machines to produce objects straight
    from the drawings.
   This is referred to as CAD/CAM
   CAM stands for Computer Aided
    Manufacture.
   This is a cheaper and quicker method of
    producing the final product.
10/03/03        Designed by Barry Forbes
Advantages of CAD

   Because 3D CAD designs are so realistic and
    can be made to look like the actual material
    they will be made from, clients can see
    exactly what is being made so a physical
    model is not required, reducing costs and the
    time it takes to design a new product.




10/03/03          Designed by Barry Forbes
Advantages of CAD
   Designers can use powerful CAD computer
    packages to make virtual reality simulations of
    the layout of their buildings.
 This means that the client can have a “look
    around” the building before it is built and changes
    can be made at this early stage.
 This results in a faster design of the building and
    a higher quality end product.
 It is also cheaper to make any changes at this
    stage rather than while the building is being
    constructed.
10/03/03              Designed by Barry Forbes
Advantages of CAD

   On an ever greater scale, the Internet can be
    used to share plans and designs with anyone
    in the world that also has an Internet
    connection.
   This means that specialised work can take
    place between different countries quickly and
    cheaply.



10/03/03           Designed by Barry Forbes
Disadvantages of CAD

   Initial costs of buying a computer system are
    high.
   As computer systems can be used to produce
    quicker CAD drawings less people need to be
    employed.
   CAD/CAM systems also means less people
    need to be employed.
   It takes a long time to make CAD drawings of
    the existing drawings a company already has.
10/03/03          Designed by Barry Forbes

				
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