Figure 3-27 is an isometric drawing of the base
pivot shown orthographically in figure 3-28. You may
think the drawing is complicated, but it really is not.
It does, however, have more symbols and abbrevia-
tions than this book has shown you so far.
Various views and section drawings are often
necessary in machine drawings because of compli-
cated parts or components. It is almost impossible to
read the multiple hidden lines necessary to show the
object in a regular orthographic print. For this reason
machine drawings have one more view that shows the
interior of the object by cutting away a portion of the
part. You can see this procedure in the upper portion
of the view on the left of figure 3-28.
Figure 3-27.Isometric drawing of a base pivot.