Chapter 7 Computer-Aided Drafting and Design
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drawing plane into four quadrants. See
Figure 7-7. Coordinates are entered as positive
or negative, depending on the location from the
origin. Referring to Figure 7-7, the coordinate
(2,2) is located in the upper-right quadrant. This
quadrant has positive X coordinates and
positive Y coordinates. The coordinate (4,–3)
is located in the lower-right quadrant. This
quadrant has positive X coordinates and
negative Y coordinates. The coordinate (–6,8)
is located in the upper-left quadrant. This
quadrant has negative X coordinates and
positive Y coordinates. The coordinate (–3,–5)
is located in the lower-left quadrant. This quad-
rant has negative X coordinates and negative
Y coordinates.
Objects drawn with XY coordinates are
suffi cient for 2D drawings. A third coordinate
(–X,+Y)
(–6,8)
Y axis
(+X,+Y)
(2,2) X axis
(4,–3)
Origin
(0,0)
(–3,–5)
(–X,–Y) (+X,–Y)
Goodheart-Willcox Publisher
Figure 7-7. The XY axes of the Cartesian coordinate
system divide the drawing plane into four quadrants.
Coordinates have positive or negative X and Y values.
Drafting/CAD Teacher
What would I do if I were to become
a drafting/CAD teacher? Because I would
be a type of career and technical education
teacher, I would use many different methods of
presenting information and concepts relating
to drafting and computer-aided drafting (CAD)
in order to help students learn how to solve
design problems. I would assist students in
learning how to properly create drawings that
are used to manufacture or construct objects.
What would I need to know? I would need
to be able to properly organize a classroom and
know how to present the information, concepts,
and skills that I need to teach my students. I
would need to know how to use (and instruct
how to use) various manual drafting tools as
well as computers and CAD software. I would
need to be familiar with and competent using
a variety of tools, techniques, and procedures
as they relate to various specialized fields of
drafting—such as mechanical, architectural,
electrical, and civil drafting. I would need to
know how to work effectively with diverse ethnic
and socioeconomic groups of students. I would
also need to know how to design classroom
presentations; plan, evaluate, and assign
lessons; prepare, administer, and grade tests;
evaluate oral presentations; maintain classroom
order and discipline; effectively work with and
communicate with other staff and parents;
assist students in setting career goals; and help
with a wide variety of extracurricular activities.
Where would I work? I would spend a
majority of my time in a classroom environment
instructing students. However, my work could
take me out of the classroom for field trips and
other academic and extracurricular endeavors.
Many teachers also have home offices where
they spend many hours preparing for their
classes.
For whom would I work? I could work for
a public school district, usually at a secondary
level. I could also work for a public or private
technical school, trade school, college, or
university. Some drafting/CAD teachers also
work for large corporations to keep professional
staffs current with the latest technologies,
practices, and procedures.
What sort of education would I need?
While in high school, I would need to take
(Continued)
Careers in Drafting
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