Drawing boards and manual drawing are not always precise
and rapid: traditional design is usually slow, especially in
its revision and modification. For this reason manufacturing
firms have replaced manual drawing with computer-aided
design (CAD) to carry out functions related to design and
production. This computer technology assists the designer in
the creation, modification and analysis of a physical object.
Nowadays computer software can easily provide a threedimensional
drawing, which allows engineering designers to
see how mechanical components may fit together without
making models thus saving a lot of time. CAD is much faster
and more accurate than manual drawing; designs can be
quickly modified, reproduced and transmitted electronically.
Computer simulated analysis of the model helps experts find
problems and defects without building prototypes, in this
way saving a lot of money and time. When the design is
ready, the CAD system can generate the detailed drawings
needed to start product manufacturing.