Computer Aided design can be defined as the use of computer to assist in creation , analysis or optimization of design .In total Computer integrated Manufacturing concept Cad is one of the core modules.Tool Designers use Cad system to perform two primary tasks

  1. To produce detailed drawing for their tool designs
  2. To carry out design analysis

There are several basic reason to use Cad systems.

  1. To increase the productivity and creativity of designers
  2. To improve the quality and accuracy of designs
  3. To improve the efficiency of communication
  4. To create a database for manufacturing and engineering
  5. To improve control of design changes.

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