Week 6_MIET2093_Perspective and Auxiliary Views_v1(1)

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MIET2012 
1 
Lecture 6: Perspective and Auxiliary 
Views 
MIET2093 
Computer Aided Design 
 
by: 
Dr. Toh Yen Pang 
tohyen.pang@rmit.edu.au 
9925 6128 
B251.3.22 
School of Aerospace, Mechanical & Manufacturing Engineering 2 RMIT University©2015 
Teaching 
Week 
Lecture Topics Tutorial Topics Assessments/
Tasks 
Week 5 Isometric Views Part Design 
(emphasise on multi-
views and projection)
Week 6 Auxiliary Views 3D modelling 
(emphasise on 
isometric views)
Quiz 2 (labs)
Test 1 (1.5hr)
Saturday, 18th April
10:00-12:30pm
Building 56, level 4 
PC labs
Week 7 Section Views 3D modelling 
(emphasise on 
Section views)
Teaching Schedule 
School of Aerospace, Mechanical & Manufacturing Engineering 3 RMIT University©2015 
Quiz 2 
1 2 3 5 64 7 A3
1 2 3 4 5 6 7 8
A
B
C
D
E
F
A
B
C
D
E
F
Week 8 - Quizz 2
DESIGNED BY:
Thierry Perret-Ellena
DATE:
2014-04-28
QUANTITY:
1 Off
CHECKED BY:
TPE
DATE:
THIRD ANGLE PROJECTION SCALE:
3:4 1/1
SHEET:
DOCUMENT TITLE:GENERAL TOLERANCE
ISO 2768 - mK
LINEAR DIMENSIONS
0.5<t 3 0.1
3<t 6 0.1
6<t 30 0.2
30<t 120 0.3
120<t 400 0.5
ANGULAR DIMENSIONS
t 10 1°
10<t 50 ±30'
50<t 120 ±20'
120<t 400 ±10'
400<t ±5'
This drawing is our property; it can't be reproduced or communicated without our written agreement.
NEXT ASSY:
SIGNATURE:
FINISH:
DOCUMENT TYPE:
Part Drawing
400<t 1000 0.8
1000<t 2000 1.2
DRAWING NUMBER:REVISION:
001
PROJECT:
MIET 2093
1414
12
5R2x 
Tritangent Fillet
A
A
D
1
1
1
4
2
4
3
1
Section view A-A
E
9
5
78
1
4
0
11
5
62
B
B
C
72
6R2x 
124x x1.75 THRU
43
16 1
2
48
Auxiliary view B
9R
20R
Detail C
Scale: 3:2
50R2x 
Detail D
Scale: 3:1
11
17
21
2R
4 25
1
.
5
4
5
Detail E
Scale: 3:2
MIET2012 
MIET 2093 
Computer Aided Design 
Revision for mid semester test 
School of Aerospace, Mechanical & Manufacturing Engineering 5 RMIT University©2015 
Part A- multiple choice 
A1 
_________ is a step in the engineering design process that involves 
reassessing the design specifications, implementing modifications, and 
updating drawings. 
A.  Conceptualization 
B.  Optimization 
C.  Refinement/Analysis 
D.  Development and implementation 
E.  Documentation 
School of Aerospace, Mechanical & Manufacturing Engineering 6 RMIT University©2015 
A2 
An advantage of this type of view is that each view shows the 
object all the way through as if it were transparent: 
A.  Planar 
B.  Horizonal 
C.  Auxiliary 
D.  Orthographic 
A3 
Which type of line is part of a dimension? 
A.  break lines 
B.  phantom lines 
C.  extension lines 
D.  cutting plane lines 
 
School of Aerospace, Mechanical & Manufacturing Engineering 7 RMIT University©2015 
A4 
Which of the following views would be needed to show the actual 
shape and size of an inclined surface? 
A.  Auxiliary view 
B.  Isometric view 
C.  Section view 
D.  Orthographic view 
A5 
What is the minimum amount of information needed to define a 3-D 
model? 
A.  vertex list 
B.  vertex list and edge list 
C.  vertex list, edge list, and face list 
D.  point list, vertex list, edge list, and face list 
School of Aerospace, Mechanical & Manufacturing Engineering 8 RMIT University©2015 
B1. Describe how coordinate space relates to engineering design. (1 
mark) 
 
B2. What kinds of graphics are used in the ideation phase (1 mark)? 
Part B- short question answer 
School of Aerospace, Mechanical & Manufacturing Engineering 9 RMIT University©2015 
B3. What is the relationship between orthographic projection and a 
multiview drawing? (1 mark) 
B4. What are the three regular views on a multiview drawing? (1 mark) 
School of Aerospace, Mechanical & Manufacturing Engineering 10 RMIT University©2015 
Part C1- sketch 
Given the isometric pictorial drawing of an object, sketch or draw the 
missing orthographic top, front and right side views of the object. (2 marks) 
School of Aerospace, Mechanical & Manufacturing Engineering 11 RMIT University©2015 
Part C2- sketch 
Given the three view mulitiview drawing of an object, sketch or draw 
the missing isometric pictorial view of the object. (2marks) 
School of Aerospace, Mechanical & Manufacturing Engineering 12 RMIT University©2015 
Mid Semester Test 
1 2 3 5 64 7 A3
1 2 3 4 5 6 7 8
A
B
C
D
E
F
A
B
C
D
E
F
DESIGNED BY:
Thierry Perret Ellena
DATE:
QUANTITY:
1 Off
CHECKED BY:
TPE
DATE:
THIRD ANGLE PROJECTION SCALE:
1/1
SHEET:
DOCUMENT TITLE:GENERAL TOLERANCE
ISO 2768 - mK
LINEAR DIMENSIONS
0.5<t 3 0.1
3<t 6 0.1
6<t 30 0.2
30<t 120 0.3
120<t 400 0.5
ANGULAR DIMENSIONS
t 10 1°
10<t 50 ±30'
50<t 120 ±20'
120<t 400 ±10'
400<t ±5'
This drawing is our property; it can't be reproduced or communicated without our written agreement.
NEXT ASSY:
DRAWING REVISION
DESCRIPTION DATE APPROVAL
01 1
ITEM REF QTY DESCRIPTION MATERIAL/DRAWING NO. REMARKS/SUPPLIER/CATALOG NO.
SIGNATURE:
FINISH:
DOCUMENT TYPE:
Part Drawing
400<t 1000 0.8
1000<t 2000 1.2
DRAWING NUMBER:REVISION:
001
PROJECT:
Aluminium Block
(NOT FOR MANUFACTURE (EDUCATIONAL ONLY)
AB-P001 1:2
2013-04-22
AERO 2430
32
1
2
5
125
3
4
5
B
B
Section view B-B
50
40
25
6
9
8
8
D
40
2
5
90 17.5
1
2
.
5
1
2
5
C
C
Section view C-C
35
1
0
2
x
 
 
x
1
.
5
3 52x 
282x 
Detail D
Scale: 1:1
2R
3
4
5
School of Aerospace, Mechanical & Manufacturing Engineering 13 RMIT University©2015 
Objectives 
•  Orthographic projection
•  Auxiliary views
Definitions
Projection theory
Draw viewing-plane lines
School of Aerospace, Mechanical & Manufacturing Engineering 14 RMIT University©2015 
Example 1 (1/3) 
1 
1 
1 
2 
2 
2 
1 
2 
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Example 1 (2/3) 
3 
3 
3 3 3 
4 
4 
4 
3 
4 
School of Aerospace, Mechanical & Manufacturing Engineering 16 RMIT University©2015 
Example 1 (3/3) 
5 
5 
5 
5 
Final shape 
of an object 
School of Aerospace, Mechanical & Manufacturing Engineering 17 RMIT University©2015 
Example 2 (1/3) 
1 
1 
2 
2 
1 
2 
1 
2 
School of Aerospace, Mechanical & Manufacturing Engineering 18 RMIT University©2015 
Example 2 (2/3) 
4 
3 
4 
3 
3 
4 
3 
4 
School of Aerospace, Mechanical & Manufacturing Engineering 19 RMIT University©2015 
Example 2 (3/3) 
Final shape 
of an object 
School of Aerospace, Mechanical & Manufacturing Engineering 20 RMIT University©2015 
Example 3 (1/4) 
1 
2 1 2 1 
1 
2 
2 
School of Aerospace, Mechanical & Manufacturing Engineering 21 RMIT University©2015 
Example 3 (2/4) 
3 
4 
4 
3 
3 3 
4 
4 
School of Aerospace, Mechanical & Manufacturing Engineering 22 RMIT University©2015 
Example 3 (3/4) 
5 
5 
6 
5 5 
6 
6 6 
7 
7 
7 7 
8 
8 
8 
8 
School of Aerospace, Mechanical & Manufacturing Engineering 23 RMIT University©2015 
Example 3 (4/4) 
Final shape 
of an object 
School of Aerospace, Mechanical & Manufacturing Engineering 24 RMIT University©2015 
Isometric Drawing
3-minute discussion 
School of Aerospace, Mechanical & ManufacturingEngineering 25 RMIT University©2015 
School of Aerospace, Mechanical & Manufacturing Engineering 26 RMIT University©2015 
Practice yourself: 
Sketch an isometric view of the cut block 
MIET2012 
Primary 
auxiliary view 
School of Aerospace, Mechanical & Manufacturing Engineering 28 RMIT University©2015 
Auxiliary View Projection Theory (1/2)
An auxiliary view is an orthographic view which is projected 
onto any plane other than the frontal, horizontal, or profile 
plane. 
A primary auxiliary view is projected onto a plane that is 
perpendicular to one of the principal pane of projection and is 
included to the other two.
School of Aerospace, Mechanical & Manufacturing Engineering 29 RMIT University©2015 
Auxiliary View Projection Theory (2/2)
Two methods of creating auxiliary views are:
1. fold-line method 
2. reference plane method
School of Aerospace, Mechanical & Manufacturing Engineering 30 RMIT University©2015 
fold-line method 
The object is suspended in a glass box to show the six principal 
views
Surface ABCD never appear true size and shape
School of Aerospace, Mechanical & Manufacturing Engineering 31 RMIT University©2015 
reference plane method
The reference plane method is a technique that locates a plane 
relative to the object
School of Aerospace, Mechanical & Manufacturing Engineering 32 RMIT University©2015 
Reasons for Auxiliary Views 
The purpose of auxiliary views are to: 
find the true size and shape of an inclined surface 
find the true length of an oblique line 
find the point view of an inclined line 
 look at the object in a different plane that is not one of the principle plane 
School of Aerospace, Mechanical & Manufacturing Engineering 33 RMIT University©2015 
Necessity
Auxiliary view is needed when it is desirable to show the true 
size and shape of a surface that is not parallel to
anyone of the principal planes of projection.
True size can not be observed
from these principal views.
School of Aerospace, Mechanical & Manufacturing Engineering 34 RMIT University©2015 
Use of auxiliary view
In practice, an auxiliary view is usually a partial view
showing only the desired information.
Example 
d 
d 
d 
d 
Complete view Partial view 
School of Aerospace, Mechanical & Manufacturing Engineering 35 RMIT University©2015 
Given
Class activity : 
Sketch a complete auxiliary view of the given object 
School of Aerospace, Mechanical & Manufacturing Engineering 36 RMIT University©2015 
Given
Practice yourself: 
Sketch a complete auxiliary view of the given object 
School of Aerospace, Mechanical & Manufacturing Engineering 37 RMIT University©2015 
School of Aerospace, Mechanical & Manufacturing Engineering 38 RMIT University©2015 
Fold-line Method
The object is suspended in a glass box, which has a special or 
auxiliary plane that is parallel to include surface 
Example 
A 
B 
D 
C 
Auxiliary 
View 
A B 
D C 
Fold 
Lines 
School of Aerospace, Mechanical & Manufacturing Engineering 39 RMIT University©2015 
Auxiliary 
plane 
Reference Plane Method
Is a technique that locates a plane relative to the object instead of 
suspending the object in a glass box. 
School of Aerospace, Mechanical & Manufacturing Engineering 40 RMIT University©2015 
Types of a Primary Auxiliary view
Primary auxiliary views may be classified into 3 types
by their relative to the principal views.
1. Adjacent to front view
2. Adjacent to top view
3. Adjacent to side view
School of Aerospace, Mechanical & Manufacturing Engineering 41 RMIT University©2015 
Width & Height 
& 
True length 
of edge view 
Width 
& 
Depth 
Height 
& 
Depth 
Auxiliary view adjacent to front view
Glass box and revolution View arrangement
True size 
of an inclined plane 
School of Aerospace, Mechanical & Manufacturing Engineering 42 RMIT University©2015 
Example 1 
Do you remember? 
Depth dimension of the auxiliary view 
can be read from top view or side view. 
Auxiliary 
plane 
School of Aerospace, Mechanical & Manufacturing Engineering 43 RMIT University©2015 
Hidden lines of the holes 
are omitted for clarity. 
Start 
Reference 
line 
A C 
D B 
Prefer 
distance 
A 
B 
C 
D 
Example 2 
School of Aerospace, Mechanical & Manufacturing Engineering 44 RMIT University©2015 
Width 
& 
Height 
Height 
& 
Depth 
Auxiliary view adjacent to top view
Glass box and revolution
Width & Depth 
& 
True length 
of edge view 
True size 
of an inclined plane 
View arrangement
School of Aerospace, Mechanical & Manufacturing Engineering 45 RMIT University©2015 
Example 
School of Aerospace, Mechanical & Manufacturing Engineering 46 RMIT University©2015 
Width 
& 
Height 
Auxiliary view adjacent to side view
Glass box and revolution
Width 
& 
Depth 
True size 
of an 
 inclined plane 
View arrangement
Height & Depth 
& 
True length 
of edge view 
School of Aerospace, Mechanical & Manufacturing Engineering 47 RMIT University©2015 
Example 
Reference 
line 
Start 
Prefer 
distance 
A 
B 
C 
A 
B 
C 
School of Aerospace, Mechanical & Manufacturing Engineering 48 RMIT University©2015 
Given
Practice yourself: 
Sketch a complete auxiliary view of the given object 
School of Aerospace, Mechanical & Manufacturing Engineering 49 RMIT University©2015 
Given
Practice yourself: 
Sketch a complete auxiliary view of the given object 
School of Aerospace, Mechanical & Manufacturing Engineering 50 RMIT University©2015 
School of Aerospace, Mechanical & Manufacturing Engineering 51 RMIT University©2015 1 2 3 5 64 7 A3
1 2 3 4 5 6 7 8
A
B
C
D
E
F
A
B
C
D
E
F
DESIGNED BY:
Thierry Perret-Ellena
DATE:
2014-04-28
QUANTITY:
1 Off
CHECKED BY:
TPE
DATE:
THIRD ANGLE PROJECTION SCALE:
3:4 1/1
SHEET:
DOCUMENT TITLE:GENERAL TOLERANCE
ISO 2768 - mK
LINEAR DIMENSIONS
0.5<t 3 0.1
3<t 6 0.1
6<t 30 0.2
30<t 120 0.3
120<t 400 0.5
ANGULAR DIMENSIONS
t 10 1°
10<t 50 ±30'
50<t 120 ±20'
120<t 400 ±10'
400<t ±5'
This drawing is our property; it can't be reproduced or communicated without our written agreement.
NEXT ASSY:
SIGNATURE:
FINISH:
DOCUMENT TYPE:
Part Drawing
400<t 1000 0.8
1000<t 2000 1.2
DRAWING NUMBER:REVISION:
001
PROJECT:
MIET 2093
Week 8 - Quizz 4
6
Tritangent Fillet
6
5R2x 
6
A
A
D
3
2
3
9
Section view A-A
1
8
1
4
E
11
93
8
4
1
4
0
75
4
B
B
C
8R2x 
124x x1.75 THRU
50
Auxiliary view B 5
7
14
.5
28
16.5
9R
20R
Detail C
Scale: 3:2
Detail D
Scale: 3:1
75R2x 
Detail E
Scale: 3:2
29
2R
4 25
23
15
1
.
5
4
5
School of Aerospace, Mechanical & Manufacturing Engineering 52 RMIT University©2015 
Given
Practice yourself: 
Sketch a complete auxiliary view of the given object