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CONVENTIONAL PRACTICE
There are some exceptions to the general rules of sectioning:
Webs, ribs, lugs, spokes,
Shafts, rods, spindles,
Bolts, nuts and thin washers.
Rivets, dowels, pins and cotters.
CONVENTIONAL PRACTICEThe cross-section is technically correct.
Convention Rotation
NOT RECOMMENDED
The convention in a drawing is to show the preferred method for sectioning this type of object.
CORRECT
TERMINOLOGY
Rib and Web are thin, flat feature of an object that
acts as a structural support.
Rib Rib
Rim
Spoke is the rod radiating from the hub to the rim
of a wheel.
Spoke
Spoke
Rim
Hub
TERMINOLOGY
Hub
CONVENTIONAL PRACTICE
Rib, Web and Lug, if the cutting plane is
passed flatwise through.
Omit the section lines on the section view of
Spoke, if the cutting plane
is passed longwise
through.
CONVENTIONAL PRACTICE
When the cutting plane
passes through the rib
transversely it should be
sectioned
EXAMPLE : WEB : flatwise cut
Normal multiview drawing
Normal section view
Section view drawing with convention
DEFINITION
Aligned section is used when features are
located on radial lines
Aligned section is a section view that is drawn
by imaginary rotating the object’s features
appeared in a principal view about symmetry
axis
CONVENTIONAL PRACTICE
For long objects that have to draw in a small
scale to fit them on the paper, it is recommended
to remove its long portion (which contains no
important information) and draw the break lines
at the broken ends.
STANDARD BREAK LINES
Rectangularcross section
Wood
Metal
Cylindricalcross section
Tubularcross section