88 Chapter 5
thographic projection views. The resulting view then reflects the true shape of the oblique feature while
eliminating much time-consuming projection for the drafter.
Auxiliary views may be full or partial views. Rounded surfaces and circular holes, which are distorted
in the regular views and appear as ellipses, appear in their true sizes and shapes in an auxiliary view,
as can be seen in Figure 5.14B.
Auxiliary views are named according to the position from which the inclined face is seen. For exam-
ple, the auxiliary view may be a front, top, bottom, left, or right view (Figure 5.15). In drawings of com-
plex parts involving compound angles, one auxiliary view may be developed from another auxiliary view.
The first auxiliary view is called the primary view, and the views developed from it are called secondary
auxiliary views.
5.6 AXONOMETRIC PROJECTION.
Axonometric projection is a technique used in orthographic pictorials. Within orthographic projection, ax-
onometric projection shows an image of an object as viewed from a skew direction in order to reveal
more than one side in the same picture, unlike other orthographic projections, which show multiple views
of the same object along different axes. Because with axonometric projections the scale of distant fea-
tures is the same as for near features, such pictures will look distorted, especially if the object is mostly
composed of rectangular features. The technique, however, is well suited for illustration purposes.
Figure 5.14A,B Two examples of auxiliary-view projections. The illustrations show that the auxiliary views
are not one of the primary views of the orthographic projection.