WHAT ARE THEY ?
SEE SOME EXAMPLES
HOW DO YOU DO IT ?
EXERCISES
WHAT ARE THEY ?
They are used on drawings to allow you to see the
inside detail of an object more clearly than hidden
detail can.
Sectional views show the internal construction
details which may not be as obvious from a
normal drawing.
SOME EXAMPLES OF SECTIONAL
VIEWS
HOW DO YOU
DO
IT
?
CUTTING PLANES.
The cutting plane shows where the
object is sliced through. It is shown
as a dashed line with thick ends.
The cutting plane has arrows to
show the direction of viewing and
letters to distinguish it from other
cutting planes.
A
A
The cutting plane shows where the
object is sliced. The direction of the
viewing is indicated by the arrows.
The part of the object BEHIND the
arrows is removed and the
sectional view is left.
To show the surface that has been
cut the section is cross hatched.
This means that lines at 45º
approximately 5mm apart are
drawn on the cut surface.
Webs.
Hatching rules.
A web is used to strengthen or
support various engineering
components.
Hatching rules.
Webs are never hatched when they
are sectioned length ways.
A
A
Hatching rules.
A
A
Sectional A-A demonstrates that you DO NOT
cross hatch a web that is sectioned along its
length.
Hatching rules.
B
B
Sectional B-B demonstrates that you DO cross
hatch a web that is sectioned across its length.
Hatching rules.
Hidden detail is never shown on a
sectional view.
You do not show sectional views
through nuts, bolts, washers,
screws and shafts.
Note no hidden
detail is shown.
Ø5
•Redraw the elevation and plan of the
toggle used at the end of a pull cord switch.
Ø 10 •Draw the sectional end elevation on X-X.
Ø 29
•Leave 50mm in between views.
Ø 39
PLAN
90
20
X
X
SECTIOAL END ELEVATION
ON X-X
ELEVATION
•Redraw the elevation and plan of a CD
spindle.
R50
R40
•Draw the sectional end elevation on X-X.
•Leave 50mm in between views.
R30
X
X
X
45
X
10
65
R10
Hatching rules.
Sectioned areas that are adjacent
to each other should be cross
hatched in different directions, still
at 45 º.
A
A