Sectioning Flashcards
When a cutting plane line passes
entirely through an object, the
resulting section is called a full
section.
FULL SECTIONS
If the cutting plane is passed halfway through an
object, and one-quarter of the object is removed, the
resulting section is a half section. A half section has
the advantage of showing both inside and outside
configurations.
HALF SECTIONS
In many cases only a small part of a view
needs to be sectioned in order to show some
internal detail. In the figure below, the broken
out section is removed by a freehand break
line. A cutting plane line does not need to be
shown, since the location of the cut is obvious.
BROKEN OUT SECTIONS
shows the shape of an object by rotating a section 90 degrees to face the
viewer. The three revolved sections illustrated in the spear-like object show the changes that take
place in its shape.
REVOLVED SECTIONS
is means of including in a
single section several features of an object that
are not in a straight line. To do this, the cutting
plane line is bent, or “OFFSET” to pass through
the features of the part.
OFFSET SECTIONS
A section removed from its
normal projected position in the
standard arrangement of views is
called a “removed” section. Such
sections are labeled SECTION AA, SECTION B-B, etc.,
corresponding to the letter
designation at the ends of the
cutting plane line. Removed
sections may be partial sections
and are often drawn to a different
scale.
REMOVED
SECTIONS
WHAT ARE THE IMPORTANCE OF SECTIONING?
- Clarification of Internal Details
- Easy Visualization
- Saving Time and Money
- Compliance with Standards
- Communication
is represented on a
drawing by a cutting plane line.
This is a heavy long-short-shortlong kind of line terminated with
arrows. The arrows in show the
direction of view
CUTTING PLANE
LINE
A surface cut by the saw in the
drawing above is a cutting plane.
Actually, it is an imaginary cutting
plane taken through the object,
since the object is imagined as
being cut through at a desired
location.
CUTTING PLANE
