oblique drawing

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.