oblique drawing
DESCRIPTION
an obliqueTRANSCRIPT
Compiled by:
DZULKIFLI AWANG, PHD
CHARACTERISTIC
TYPES
EXCERCISES
CONSTRUCTION
CONCEPT OBLIQUE
DRAWING
ORIENTATION
Oblique Views
Oblique views are a type of pictorial view.
They show an object from the front with all
depths at an angle of 45°.
These depths are also drawn at half their
actual size.
CONCEPT Oblique Axis
CONCEPT Oblique Axis
Horizontal Axis
CONCEPT Oblique Axis
Horizontal Axis
Vertical Axis
CONCEPT Oblique Axis
Horizontal Axis
Vertical Axis
Receding Axis
(any convenient
angle 30°, 45° & 60°)
Receding Axis
300
600
450
Oblique Line
Charateristics
of Oblique
Non Oblique
Line
Angle in Oblique
Arc in Oblique
Circle in Oblique
A
C B
E
D
G
F
H
I
+
45o
The oblique lines are lines
that are parallel to any
oblique axis.
A
C B
E
D
G
F
H
I
+
60o
60o
An angle on an object surface that is
parallel to the front projection plane
or receding plane
+
45o
B
A
C
D
E
H
I G
F
Any object lines that is not
parallel to any oblique axis.
45o
B
A
C
D
E
H
I G
F
A circle that is parallel to the
front projection plane is a
circle of actual size while on
a receding plane would
appear is an ellipse.
A
B C
D
E
H
I
An arc which is parallel to
the projection plane shows
its true size.
TYPES OF OBLIQUE
DRAWING
CAVALIER OBLIQUE ( D )
CABINET OBLIQUE ( 1/2 D )
COMMON OBLIQUE ( 3/4 D )
100 50 75
D = Depth
Cavalier Projection
When the receding
lines are true
length, and the
projectors are at
45 degrees to the
plane of projection,
the oblique
drawing is called
cavalier projection
Cabinet Projection
When the
receding lines
are drawn to half
size, the drawing
is known as a
cabinet
projection
Common Projection
When the
receding lines
are drawn to 3/4
size, the drawing
is known as a
common
projection
ORIENTATION OF
OBLIQUE DRAWING
1. Circle Orientation
2. Arc Orientation
3. Curve Orientation
Circle Orientation
Arc Orientation
Curve Orientation
Offset Measurements
Circles, circular arcs, and other curved
surfaces are drawn using offset
measurements
Angles in Oblique Projection
When an angle is specified in degrees in a
receding plane, convert the angle into
linear measurements to draw the angle in
an oblique drawing
Angles in Oblique Projection
Oblique Dimensioning
Oblique drawings are dimensioned in a
similar fashion as isometric drawings
Screw Threads in Oblique
Partial circles spaced equally show
symbolic thread pitch
CONSTRUCTION OF OBLIQUE DRAWING BY BOX METHOD
450
Top View
Front View
Figure shows that the top and front views of objects. Draw this
objects in cavalier oblique drawing. Use 10 mm x 10 mm grid.
EXERCISE
ANSWER
Redraw this object in cavalier and in cabinet oblique
drawings.
EXERCISE
Oblique Views - EXAMPLE
An oblique view of
a shape is shown
below.
The next few slides
will show you how
to draw it.
Oblique Views
Elevation End Elevation
Plan
Here the orthographic views
of the object are shown. D
Oblique Views
Start the oblique drawing by
redrawing the elevation full size.
Oblique Views
Now draw in the construction for the depths of the object.
All depths
are drawn at
45°.
Oblique Views
Now mark on the sizes of the depths of the object.
All depths are
dimensioned
1/2
actual size-
Cabinet
oblique.
1/2 D
Oblique Views
Now we will get rid of the projection lines to see the
drawing more easily.
The depths for the square
boxes have been drawn but
now we need to add the
front depth.
Oblique Views
If you haven’t done so already, draw the centrelines for the
circle on your drawing.
Oblique Views
Use your 45° set square again and project a line forward.
Oblique Views
Mark on the depth at 1/2 the length as before.
Oblique Views
Draw centrelines at this point.
Oblique Views
Using a compass draw the circle from this new centrepoint.
Oblique Views
Now join the outsides of the two circles to complete this
part.
Oblique Views
Rub out any lines you would not see.
Oblique Views
This is the final shape you are left with.