OBLIQUE DRAWING

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At the end of this unit, you will be able to :

i. Describe the concept of oblique drawing.

ii. Determine types of oblique drawing.

iii. Select the best orientation of oblique drawing.

iv. Construct oblique drawings.

v. Dimensioning of oblique drawings.

vi. Apply oblique drawing in engineering fields.

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EXERCISES

UNIT 9 : OBLIQUE DRAWING

9.1 Concepts of Oblique Drawing

9.2 Types of Oblique Drawing

9.3 Oblique Drawing Orientation

9.4 Constructions of Oblique Drawing

9.5 Dimensioning of Oblique Drawing

9.6 Application of Oblique Drawing

in Engineering

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9.1 CONCEPTS OF OBLIQUE DRAWING

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Concept of Projection in Oblique Drawing

Figure : Comparison between orthographic and oblique projection

Orthographic projection

Oblique projection

Object

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Oblique Axis

Vertical axis

Horizontal axis

Receding axis

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Wide receding angle axis Narrow receding angle axis

Figure : Receding axis angle

Receding Angle

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Positions of Receding Axis

Figure : Different positions of the receding axis affect the object shape

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Concept of Circles, Arcs and Curve in Oblique Drawing

The shape seen from the front view are drawn in full scale and constitute the actual surfaces in an oblique projection. While the side and top views are drawn based on the receding axis position.

The circles, arcs and curves which are parallel to the oblique projection are considered the actual object shapes and sizes. These shape can be drawn directly using compass and other drawing tools.

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Concept of Circles, Arcs and Curve in Oblique Drawing

The circles, arcs and curves can be shown in their actual shapes in oblique drawing when they are parallel to the front surface.

A circle on a receding plane appears to look like an ellipse and its construction is made by using the coordinate or four-centre method.

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Identifying Characteristics of Oblique Drawing

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DE• The Oblique line are line that are parallel to any oblique axis. Examples of oblique line AB, BC and BH are shown in Figure.

a) Oblique Lines

a) Non Oblique Lines

• Any line that is not parallel to any oblique line. GF and HI are examples of non-oblique line.

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Identifying Characteristics of Oblique Drawing

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• An angle on an object that parallel to front projection plane is true angle.

(i).Angle is parallel to the front projection plane.(ii). Angle is parallel to the receding projection

plane.

c) Angle in Oblique

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Identifying Characteristics of Oblique Drawing

d) Circle in Oblique

• A circle that is parallel to the front projection plane is a circle of actual size while a circle on a receding plane wound appear as an ellipse.

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Identifying Characteristics of Oblique Drawing

e) Arcs in Oblique

• An arc which is parallel to the projection plane shows its true size

• Figure shows an arch are not parallel to the projection plane but parallel to the receding plane

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9.2 TYPES OF OBLIQUE DRAWING

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Type Of Oblique Drawing

i) Cavalier Oblique

ii) Cabinet Oblique (1/2D)

iii) Common Oblique (3/4D)

a) Orthographic view

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9.3 OBLIQUE DRAWING ORIENTATION

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Oblique Drawing Orientation

Orientation Selection Selecting the best orientation is important in

construction oblique drawing. The best orientation for drawing circles, arcs and curves are shown in figure below.

(a) Circle orientation (b) Arc orientation (c) Curve orientation

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Oblique Drawing Orientation

These shapes are placed parallel to the surface of front projection plane so that the actual shape can be drawn directly using a compass.

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There are two method :i. Box Method

ii. Frame Methoda. Four-centre Method

b. Coordinate Method

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This method can be used to all types of oblique drawings.

Lets learn steps in constructing an oblique drawing using box

method…

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Box Method

This method can be used to all types of oblique drawings.

Lets learn steps in constructing an oblique drawing using box method…

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Given orthographic drawing

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Frame Method

This method is used to construct object with circular or arced surfaces.

The shape is constructed based on the circle centre.

The object position is set so that the circular surface always face the front and parallel to the projection plane.

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Given orthographic drawing

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Construction of Circle on Oblique Axis

Circle and arcs located to the parallel to the front surfaces will show the real object shape and may be drawn directly using a compass

A circle or an arc that is not parallel to the front surface will appear like an ellipse

There are two method : Four Center Method Coordinate Method

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Four Centre Method

• This method is used to construct cavalier oblique drawing only.

• The construction is based on a full scales rhombus on the receding axis

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Coordinate Method

The coordinate method is a method of drawing circles or arcs on the receding axis

When the size of the receding axis is smaller, the size of the corresponding circle or arcs will also be smaller

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The method in constructing circles on a cube in a cabinet oblique drawing and a cavalier oblique drawing is shown below.

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Divide the circle into eight equal parts.

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Draw straight lines intersecting the arc.

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Cabinet Oblique

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Cavaliar oblique

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The method in dimensioning oblique drawings is the same as in isometric drawing.

The general dimensioning practice such as dimension and direction lines, arrow pointer and additional line must be

adhered.

Examples of a cavalier oblique drawing dimensioning in aligned system and oblique cabinet drawing in unidirectional

system are shown .

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Cavalier Oblique In Aligned System

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Cabinet Oblique In Unidirectional System

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Machine BladeMachine Blade

Machine Component

Double SwitchDouble Switch

Shoes Rack

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EXCERCISE QUESTION 1 QUESTION 2 QUESTION 3 QUESTION 4 QUESTION 5

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The oblique drawing can be divided into 3 types.

i) Cavalier Obliqueii) Cabinet Obliqueiii) Common Obliqueiv) Normal Oblique

QUESTION 1

Choose the correct answers.

A. i and iiB. ii,iii and ivC. i,ii and iiiD. i.ii,ii and iv

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QUESTION 2Oblique drawings have several important characteristics as follows:

A. Oblique LinesB. Non-Oblique LinesC. Angles in ObliqueD. Circle in ObliqueE. Arcs in ObliqueF. Rectangular in Oblique

Based on the statement above, which characteristic is NOTINCLUDE in characteristics of oblique drawings. Please choose theanswer correctly.

A) B) C) D) E) F)

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QUESTION 3Selecting the best object orientation is important in constructing oblique drawing. The best orientation for drawing as follows:

i) Circle Orientationii) Straight Orientationiii) Arc Orientationiv) Curve Orientation

Choose the correct answers.

A. i and iiB. ii and iiiC. i,iii and ivD. i.ii,ii and iv

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QUESTION 4

Based on picture above, what (i), (ii) and (iii) stand for what? Choose the correct answer.

A. Vertical axis, Horizontal axis and Receding axis.B. Horizontal axis, Vertical axis and Receding axis.C. Vertical axis, Receding axis and Horizontal axis.D. Horizontal axis, Receding axis and Vertical axis.

(i)

(ii)

(iii)

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QUESTION 5

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Base on the picture above, which lines are show non-oblique lines.

A. GF and HIB. BC,ID and EFC. AB,BC and BHD. FI, ED, GH and AB

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