This document provides information about a Mechanical Working Drawing course, including: - The instructors, textbook, and intended learning outcomes which are to understand machine assembly drawings, distinguish between working and assembly drawings, and professionally create drawings according to standards. - The course outline covers topics like reading drawings, freehand sketching, assembly drawings, fits and tolerances, and threaded joints over 14 weeks. - Assessment includes measuring achieved objectives, identifying areas for improvement, and completing term projects and problem sheets.

1. Siddhant College of Engineering Diploma
Sudumbare, Pune -412109
Instructors: Mr. Nitin B. Watode
e-mail: watodenitin1@gmail.com
Textbook and Reference Materials:
 K.L. Narayana, P. Kannaiah, and K. Venkata Reddy, "Machine Drawing", Third Edition, NEW
AGE INTERNATIONAL (P) Ltd., New Delhi - 110002, 2006.
Class notes handouts
Mechanical Working Drawing
(22341)

2. Intended Outcomes
Knowledge and Understanding:
You will learn how to;
 Understand the basic methods for machine assembly
 Distinguish between the data and instructions used for both working and assembly drawings
 Professionally deduce and sketches both working and assembly drawings according to the
international standards
Intellectual
You will learn how to;
 Motivate your intellectual abilities to imagine and deduce machine parts and a whole machine
from the drawings views.
 Motivate your imagination for producing new ideas and methods in machine drawings.
 Create new concepts for the design of machine components and also for assembly of them.
Professional Skills
You will learn how to;
 Practice the standard drawing methods to generate both working and assembly mechanical
drawings.
 Write and specify correctly and according to standards the instructions and machining marks
and the dimensions on mechanical drawings.
General
You will learn how to;
 Cooperate to work in groups through small scale projects
 Work coherently and successfully as a part of a team.

3. Course Outline
Topic Weeks
1. Revision Chapters (1-4) 1
2. Reading A Drawing Chapter (17) 1
3. Free Hand Sketching Chapter (13) 1
4. Assembly Drawings Chapter (18) 1
5. Fits and Dimensional Tolerances Chapter (15) 1
6. Geometrical Tolerances Chapter (20) 2
7. Engineering Materials Collections 1
8. Working Drawings Chapter (19-20) 1
9. Mechanical Joints (1- Threaded Joints) Chapter (5) 3
10. Machine Parts Collections 2
Total 14
 Problems Sheets will be handed in the class after discussed in the lecture
 An extra class will be given to students with Mark “C” every next Saturday
 A term project will be given by Dr. Wael and will be submitted at the end of
the term

4. Course Assessment and Evaluation
 Why do we learn?
 To gain knowledge
 To achieve objectives
 To build career
 Why do we need assessment and evaluation?
 To measure the achieved objectives
 To point out what in need for improvements
We shouldn’t learn to get marks
We shouldn’t learn to get certificates
We shouldn’t learn to get titles

5. Revision

6. How to Keep Your Drawing Clean
Do Don’t

7. Drawing Sheet Size
Assembly Drawing
Working Drawing

8. Types of lines and their applications

9. Types of lines and their applications

10. Types of lines and their applications

11. PROJECTION SYSTEMS

12. PROJECTION SYSTEMS
1. First angle system
2. Third angle system
First Quadrant
Third
Quadrant
- European country
- ISO standard
- Canada, USA,
Japan, Thailand

13. ORTHOGRAPHIC PROJECTION
1st angle system 3rd angle system

14. ORTHOGRAPHIC VIEWS
1st angle system 3rd angle system
Folding
line
Folding
line
Folding
line
Folding
line

15. ORTHOGRAPHIC VIEWS
1st angle system 3rd angle system
Front View
Front View
Right Side View
Right Side View
Top View
Top View

16. First angle system Third angle system
PROJECTION SYMBOLS

17. Quick Quiz

18. 3. Which is in correct first angle projection ? (180 sec)
a) b)
c) d)
45 90 135 180
0

19. 4. Which is in correct third angle projection ? (180 sec)
a) b)
c) d)
45 90 135 180
0

20. 5. Which is a wrong 3rd angle orthographic views ?
(180 sec)
45 90 135 180
0
a) b)
c) d)

21. VIEW SELECTION STEPS
1. Orient the object to the best position
relative to a glass box.
2. Select the front view.
3. Select adjacent views.

22. STEP 1 : Orient the Object
The object should be placed in its natural position.
NO !
The object should presents its features in actual
size and shape in orthographic views.
GOOD

23. STEP 2 : Select a Front View
The object’s longest dimension should be
presented as a width.
Inappropriate
First choice
GOOD
Second choice
Waste more space

24. Inappropriate
The adjacent views that are projected from the
selected front view should appear in its natural
position.
STEP 2 : Select a Front View

25. STEP 2 : Select a Front View
Choose the view that have the fewest number of
hidden lines.
GOOD Inappropriate

26. STEP 3 : Select an Adjacent View
GOOD
Inappropriate
Inappropriate
GOOD
Choose the view that have the fewest number of
hidden lines.

27. Choose the minimum number of views that can
represent the major features of the object.
STEP 3 : Select an Adjacent View
Necessary
Necessary
Hole’s location can be
specified on the same view.
Difficult to interprete.
Easy to understand

28. Choose the views that are suitable to a drawing
space.
STEP 3 : Select an Adjacent View
POOR
Not enough space
for dimensioning.

29. Choose the views that are suitable to a drawing
space.
STEP 3 : Select an Adjacent View
GOOD

30. Example : View selection
Shape description
Size description
F.V.
W D

W
H

D
mislead to…




F.V. & T.V. Three views F.V. & R.S.V.
H

31. ONE-VIEW DRAWING
Flat part having a uniform thickness.
Unnecessary These 2 views provide only information
about the part thickness !
1 Thick

32. ONE-VIEW DRAWING
Cylindrical-shaped part.
Unnecessary
Repeat !
Infer from CL
Unnecessary

33. TWO-VIEW DRAWING
There exists an identical view.
Repeat !
Unnecessary

34. The 3rd view has no significant contours of the object.
TWO-VIEW DRAWING
Unnecessary

35. TWO-VIEW DRAWING
Unnecessary
The 3rd view has no significant contours of the object.

36. Quick Quiz

37. 1. Which should be the natural position of the light
bulb ? (20 sec)
c)
b)
a
d)
5 10 15 20
0

38. A
B
C
D E
F
2. Which are the necessary views ? (60 sec)
a) A-C-E
b) E-B-D
c) E-A
d) E-C
15 30 45 60
0

39. Projection

40. Projection

41. Projection

42. Quick Quiz

43. Projection
A(FV)
B(FV) C(FV)
D(FV)
A(TV)
B(SV)
C(SV)
D(SV)

44. Drawing Reading

45. Drawing Reading
Rear tool post is generally used on capstan lathes, mainly for parting-off operations. It is fixed
on the cross-slide in the slots, provided at the rear side of the lathe