This document discusses oblique drawings and related concepts. It defines oblique lines as lines parallel to any oblique axis. It explains that objects not parallel to an oblique axis are non-oblique lines. Angles on object surfaces parallel to the front projection plane or receding plane are considered oblique angles. Circles parallel to the front projection plane appear at actual size, while on a receding plane they appear as ellipses. Arcs parallel to the projection plane show their true size. The document provides examples of constructing oblique drawings using the box method and exercises readers to redraw objects in cavalier and cabinet oblique drawings.

1. CHARACTERISTIC
TYPES
EXCERCISES
CONSTRUCTION
CONCEPT OBLIQUE
DRAWING
ORIENTATION

2. CONCEPT
Oblique Axis

3. CONCEPT
Oblique Axis
Horizontal Axis

4. CONCEPT
Oblique Axis
Vertical Axis
Horizontal Axis

5. CONCEPT
Oblique Axis
Horizontal Axis
Vertical Axis
Receding Axis
(any convenient
angle 30°, 45° & 60°)

6. Receding Axis
300
600
450

7. Charateristics
of Oblique
Oblique Line
Non Oblique
Line
Angle in
Oblique
Circle in
Oblique
Arc in
Oblique

8. A
CB
E
D
G
F
H
I
+
45o
The oblique lines are lines
that are parallel to any
oblique axis.

9. +
45o
B
A
C
D
E
H
I G
F
Any object lines that is not
parallel to any oblique axis.

10. A
CB
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

11. +
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.

12. A
B C
D
E
H
I
An arc which is parallel to
the projection plane shows
its true size.

13. CAVALIER
OBLIQUE ( D )
CABINET OBLIQUE
( 1/2 D )
COMMON OBLIQUE
( 3/4 D )
100
50 75

15. Circle Orientation

16. Arc Orientation

17. Curve Orientation

18. CONSTRUCTION OF OBLIQUE DRAWING BY BOX METHOD
450
Top View
Front View

19. Example 1

20. 45˚

21. 45˚

23. 45˚

24. 45˚

26. ⁰
45˚
A
B
C
D

27. 45˚

28. Redraw this object in cavalier in cabinet oblique drawings.
EXERCISE

29. Figure shows that the top and font views of objects. Draw this
objects in cavalier oblique drawing. Use 10 mm x 10 mm grid.
EXERCISE