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Technology: Engineering Our World
The process of creating drawings to specify the exact size, shape, and
features of a design idea is called drafting. Drafting has always been
known as the “language of industry.” It prevents confusion about the
size and shape of an object or structure.
The three types of drawings are isometric, perspective, and
orthographic projection. These three types are summarized in Figure 3-8.
All three may be produced freehand. This is known as sketching. All three
may also be drawn using manual drafting equipment or computer-aided
drafting systems.
Freehand Sketching
Freehand sketching is an essential step when designing a product. g
First, it allows you to record your ideas rapidly so you don’t forget
them. Sketching is a way of talking to yourself. Second, it allows you to
share and discuss your ideas with other people. Third, it makes it easier
to develop ideas. Whether you set out to design a running shoe, a sofa,
or a boat, generating alternative ideas should start with small sketches.
For example, the designer of the riverboard explored his early ideas by
making the sketches shown in Figure 3-9.
gure 3-7. Several drawings will be needed to describe the parts of this flashlight so others
can make it.