N.N.V. Krishna kanth
• Design is the human power to conceive, plan,
and realize products that serve human beings
in the accomplishment of any individual or
What is Design?
• An electronic system using computers for
designing new parts or products or for
modifying existing ones.
• Computer-aided design (CAD) is the use of
computer systems to assist in the creation,
modification, analysis, or optimization of a
Introduction of CAD
• CAD consit’s of a powerful desktop computer
and graphics software that enables designer
to manipulate geometric shapes.
• It replaces the traditional drafting work done
by a draftsman on a drafting board.
Advantages of CAD
• Saves time and money.
• Eliminates prototype model building to prove the designs.
• Allows designers to determine costs and test such variables as
stress, tolerance, product variability, interchangeability and
• Low cost of design.
• Eliminates manual drafting completely.
• Easy to manipulate.
• Makes review of numerous options in designs possible before
final commitments are made.
• Faster development, better products and accurate flow of
information to other departments.
• Product cost can be determined at the design stage itself.
• Computer-aided manufacturing (CAM) is the
use of computer systems to plan, manage, and
control the operations of a manufacturing
plant through direct or indirect computer
interface with plant’s resources.
• When CAD information is translated into
instructions for CAM the result of these two
technologies is referred to as CAD/CAM
• NC – Numerical Control
• CNC – Computer Numerical control
Need for CAD/CAM
• To increase productivity of the designer
• To improve quality of the design
• To improve communications
• To create a manufacturing database
• To create and test tool paths and optimize them
• To help in production scheduling and MRP models
• To have effective shop floor control
• Computer Integrated Manufacturing is a
system which acts as a bridge or umbrella to
integrate product design and engineering,
process planning and manufacturing using
Automated Storage and
(ASRS) and Automated
Guided Vehicles (AGVs)
Tools of CAD/CAM
• AutoCAD (CAD)
– Computer Aided Design or Computer Aided Drafting
– For 2D and 3D design and drafting, developed and sold
by Autodesk, Inc. in 1982
– Earlier primitive entities used such as lines, poly lines,
circles, arcs, and text
– But now it has solid modeling and 3D tools
– Has supported custom objects through its C++ API
– Application Programming Interfaces (APIs) for
customization and automation
– Include AutoLISP, Visual LISP, VBA, .NET and ObjectARX
– Computer Aided Three-dimensional Interactive
– By the French company Dassault’s Systems
– Created in the late 1970s and early 1980s to
develop Dassault's Mirage fighter jet
– Adopted in the aerospace, automotive,
shipbuilding, and other industries
• Modules of CATIA
– Product Structure
– Part Design
– Assembly Design
– Drafting (Interactive and Generative)
– Wireframe and Surface
– Freestyle Shaper
– Digital Shape Editor
– Knowledge ware
– Photo Studio
– 4D Navigator (including kinematics)
– Finite Element Analysis