PRIN. OF DRAFTING AND SHOP DRAWINGS - OD1641 - LESSON 1/TASK 1
g. Planes.
As the line projection theory was derived from the point projection
theory, so the plane projection theory follows directly from the line projection
theory. If we consider the following axiom:
To a draftsman, a plane
is
the
area
enclosed
within
a
series
of
lines
interconnected end to end.
This differs from the geometric concept of planes in that it considers a plane a
finite area, that is, an area with known boundaries. Figure 12 gives the front and
top views of plane 1-2-3-4 and asks for the right side view.
FIGURE 12.
PLANE PROJECTION PROBLEM.
Figure 13 (on the following page) shows the solution, which was derived at by the
following:
Step 1.
Identify the lines that define plane 1-2, 2-4, 4-3, and 3-1.
Step 2.
Project the individual points 1, 2, 3, and 4 into the right side view.
Step 3.
Draw in, with object lines, the lines that define the plane.
12
Previous Page
