(1) Full-sections. When the cutting plane
view [1] (fig 1-20). The cutting plane is usually
is a single continuous plane passing entirely through
taken straight through on the main axis or center line.
the object, the resulting view is called a full-section
Figure 1-20. Full and half-sectional views.
(2) Half-sections. The cutting plane will
view, and the top views show the offset cutting plane
not always be taken completely through the object.
line. Notice that there is no line on the section view
[2] Figure 1-20 shows a half section. The cutting
at the point where the cutting plane goes straight
plane passes only half way through the object. This
back.
is common practice for symmetrical objects. In the
case illustrated, the top half, if sectioned, would be
To eliminate
(4) Revolved section.
identical to the bottom half, providing no additional
drawing extra views of rolled shapes, ribs, and
information. The half-section permits both the
similar forms, a revolved section is used. It is a
internal and external features to be shown and their
drawing within a drawing, and it clearly describes the
relationship to one another.
object's shape at a certain cross-section station or
point. The sectional view of the rib in figure 1-22
(3) Offset section. A section view which
has been revolved so that you can look at it head-on.
has the cutting plane changing direction backward
and forward (zig-zag), so as to pass through features
that are important to show, is known as an offset
section. The offset cutting plane in figure 1-21 is
arranged so that the hole on the right side will be
shown in section. The sectional view is the front
Figure 1-22. Revolved section.
(5) Removed section. Removed sections
are normally used to illustrate particular parts of an
object (fig 1-23). They are drawn like the removed
section, except that they are placed at one side to
bring out important details. They are often drawn to
a larger scale than the view on which they are
indicated.
(6) Broken-out section. A broken-out
section is a partial section used on an exterior view to
Figure 1-21. Offset section.
show some interior detail without
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