oblique drawing

46
Compiled by: DZULKIFLI AWANG, PHD

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an oblique

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Page 1: Oblique Drawing

Compiled by:

DZULKIFLI AWANG, PHD

Page 2: Oblique Drawing

CHARACTERISTIC

TYPES

EXCERCISES

CONSTRUCTION

CONCEPT OBLIQUE

DRAWING

ORIENTATION

Page 3: Oblique Drawing

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.

Page 4: Oblique Drawing

CONCEPT Oblique Axis

Page 5: Oblique Drawing

CONCEPT Oblique Axis

Horizontal Axis

Page 6: Oblique Drawing

CONCEPT Oblique Axis

Horizontal Axis

Vertical Axis

Page 7: Oblique Drawing

CONCEPT Oblique Axis

Horizontal Axis

Vertical Axis

Receding Axis

(any convenient

angle 30°, 45° & 60°)

Page 8: Oblique Drawing

Receding Axis

300

600

450

Page 9: Oblique Drawing

Oblique Line

Charateristics

of Oblique

Non Oblique

Line

Angle in Oblique

Arc in Oblique

Circle in Oblique

Page 10: Oblique Drawing

A

C B

E

D

G

F

H

I

+

45o

The oblique lines are lines

that are parallel to any

oblique axis.

Page 11: Oblique Drawing

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

Page 12: Oblique Drawing

+

45o

B

A

C

D

E

H

I G

F

Any object lines that is not

parallel to any oblique axis.

Page 13: Oblique Drawing

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.

Page 14: Oblique Drawing

A

B C

D

E

H

I

An arc which is parallel to

the projection plane shows

its true size.

Page 15: Oblique Drawing

TYPES OF OBLIQUE

DRAWING

CAVALIER OBLIQUE ( D )

CABINET OBLIQUE ( 1/2 D )

COMMON OBLIQUE ( 3/4 D )

100 50 75

D = Depth

Page 16: Oblique Drawing

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

Page 17: Oblique Drawing

Cabinet Projection

When the

receding lines

are drawn to half

size, the drawing

is known as a

cabinet

projection

Page 18: Oblique Drawing

Common Projection

When the

receding lines

are drawn to 3/4

size, the drawing

is known as a

common

projection

Page 19: Oblique Drawing

ORIENTATION OF

OBLIQUE DRAWING

1. Circle Orientation

2. Arc Orientation

3. Curve Orientation

Page 20: Oblique Drawing

Circle Orientation

Page 21: Oblique Drawing

Arc Orientation

Page 22: Oblique Drawing

Curve Orientation

Page 23: Oblique Drawing

Offset Measurements

Circles, circular arcs, and other curved

surfaces are drawn using offset

measurements

Page 24: Oblique Drawing

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

Page 25: Oblique Drawing

Angles in Oblique Projection

Page 26: Oblique Drawing

Oblique Dimensioning

Oblique drawings are dimensioned in a

similar fashion as isometric drawings

Page 27: Oblique Drawing

Screw Threads in Oblique

Partial circles spaced equally show

symbolic thread pitch

Page 28: Oblique Drawing

CONSTRUCTION OF OBLIQUE DRAWING BY BOX METHOD

450

Top View

Front View

Page 29: Oblique Drawing

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

Page 30: Oblique Drawing

ANSWER

Page 31: Oblique Drawing

Redraw this object in cavalier and in cabinet oblique

drawings.

EXERCISE

Page 32: Oblique Drawing

Oblique Views - EXAMPLE

An oblique view of

a shape is shown

below.

The next few slides

will show you how

to draw it.

Page 33: Oblique Drawing

Oblique Views

Elevation End Elevation

Plan

Here the orthographic views

of the object are shown. D

Page 34: Oblique Drawing

Oblique Views

Start the oblique drawing by

redrawing the elevation full size.

Page 35: Oblique Drawing

Oblique Views

Now draw in the construction for the depths of the object.

All depths

are drawn at

45°.

Page 36: Oblique Drawing

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

Page 37: Oblique Drawing

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.

Page 38: Oblique Drawing

Oblique Views

If you haven’t done so already, draw the centrelines for the

circle on your drawing.

Page 39: Oblique Drawing

Oblique Views

Use your 45° set square again and project a line forward.

Page 40: Oblique Drawing

Oblique Views

Mark on the depth at 1/2 the length as before.

Page 41: Oblique Drawing

Oblique Views

Draw centrelines at this point.

Page 42: Oblique Drawing

Oblique Views

Using a compass draw the circle from this new centrepoint.

Page 43: Oblique Drawing

Oblique Views

Now join the outsides of the two circles to complete this

part.

Page 44: Oblique Drawing

Oblique Views

Rub out any lines you would not see.

Page 45: Oblique Drawing

Oblique Views

This is the final shape you are left with.

Page 46: Oblique Drawing