164 Section 2 Drafting Techniques and Skills
If you are using a CAD system, choose the
most appropriate commands and functions
that are available to you. Also, use construction
methods that create the intended results accu-
rately and in the most efficient manner possible. fi
One of the primary benefits of CAD is improved fi
productivity. In many cases, objects should not
have to be drawn more than once. Objects that
are drawn should be used repeatedly, if possible.
In making geometric constructions, use tools
such as object snaps and editing functions such
as copying and trimming to maximize drawing
efficiency and accuracy. fi
Constructing Lines
There are a number of geometric construc-
tion procedures the drafter needs to perform
using straight lines. These include bisecting
lines, drawing parallel and perpendicular lines,
and dividing lines. These drawing procedures
are presented in the following sections.
Figure 6-1. Geometric construction is used in building highways and architectural structures.
(Left—US Department of Transportation)
Figure 6-2. Drawing a machine part may require the application of different geometric concepts. (Autodesk, Inc.)