Figure 1-25. Alined section.
Figure 1-23. Removed section.
drawing a complete full or half section. The limit of
the broken-out section is indicated with an irregular
break line. In figure 1-24, the inside of the fitting is
better illustrated because of the broken-out section.
Figure 1-26 Phantom view.
e. Development. A development is a drawing
which is used for objects which are made from flat
Figure 1-24. Broken-out section.
materials by bending and joining, such as ducts. The
development (also called a stretch-out or pattern
(7) Alined section. Look at the front view
drawing) shows the shape of the material before it is
of the handwheel in figure 145 and notice the cutting
formed into the assembled object (fig 1-27).
plane line AA. When a true sectional view might be
misleading, parts such as ribs or spokes are drawn as
f. Exploded Views. Exploded views are used
if they are rotated into or out of the cutting plane.
to illustrate the assembly or disassembly of a unit
Notice that the spokes in the section at A-A are not
which has several removable parts. It is basically a
sectioned. In some cases, though not in this figure, if
pictorial view of each of the parts to the same scale,
the spokes were sectioned, the first impression would
with the parts arranged in a relationship which
be that the wheel had a solid web rather than spokes.
corresponds to their relationship when assembled (fig
1-28).
d. Phantom Views. Phantom views are
used to indicate the alternate position and path of
1-6.
DIMENSIONS
motion of parts, repeated details, or the relative
position of an absent part. Figure 1-26 shows the
a. The item you will be most concerned with
alternate position of a part as a phantom view (the
when reading prints is the dimensions. As previously
part of the left side).
stated, dimensions on architectural drawings are
usually given in feet,
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