Production Engineering:

• Bill of materials.
• Material needs.
• Manufacturing resource needs.
• Scheduling.

Inspection and Quality Control

• Program generation for inspection machines.
• Comparison of produced parts along with design.

Based upon the requirements of the user and the capabilities of CAD system, a geometric model constructs a product in one of 2-D, 2½-D and 3-D type models. A 2-D model represents a plane figure that means with length, breadth and '0' (zero) thickness.

A 2½-D model shows a component with length, breadth but constant thickness.

A 3-D model shows any generalized part shape with length, breadth and thickness as well.

Modern CAD systems described objects in 3-D. Therefore, the designer might construct 3-D model of objects conveniently and store the database of the model in the computer.

Geometric models may be classified into three types :

1.      Wire-frame model.

2.      Surface model.

3.      Solid model.