Orthographic Projections, Continued
Position of the
When you see all six planes of projection with their respective images in
principal views
space, they form a transparent, box-like structure in which the object itself
appears suspended in air. In third-angle projection, as the box opens, all
views rotate toward the observer as though they were hinged.
The front view
always lies in the plane of the drawing surface and does not rotate.
Each
view has two of the three common space dimensions of height, length, and
depth and adjacent views supply the missing dimension. The relative
positions of the six principal views and their relationship to each other are
logically arranged on a drawing surface.
Figure 6-26 shows the revolution and eventual position of the six principal
views in third-angle projection.
Figure 6-26.—Revolution and position of the six principal views in third-
angle projection.
Continued on next page
6-31
