The document provides information about a Machine Construction course (MD 121) including:
- Details about the course such as instructors, office hours, textbooks, and intended learning outcomes. Students will learn machine assembly methods, working and assembly drawings, tolerances, and more.
- The 14-week course outline covering topics such as reading drawings, sketching, fits and tolerances, and mechanical joints.
- Assessment details including assignments, quizzes, exams, and grading breakdown.
1. MD 121
Machine Construction
Saturdays, 10:00 am– 12:00 am @ Room 420
Instructors: Dr. Khaled Ahmed, Assistant Professor
Dr. Wael Khair, Assistant Professor
Office Hours: Saturdays 2-3;
Tel: 1058;
e-mail: dr.kh.ahmed@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.
K. Venkata Reddy, “Text Book of Engineering Drawing", Second edition, BS Publications,
Hyderabad - 500 095 - A.P, 2008.
Colin H Simmons, and Dennis E Maguire, "Manual of Engineering Drawing", Second edition,
Elsevier Newnes, Burlington MA 01803, 2004.
Class notes handouts
2. Intended Learning Outcomes (ILO’s)
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
Class Work …………………………………………………….. 10%
Extra Class Work (Mark “C” students will get bonus) …….. 10%
Course Project ………………….……………………………… 10%
Lecture Quizzes ……………..………………………………… 5%
Mid Term (November 27th 2010)…………………………… 10%
Final Exam (Sit in Exam)……………………………………… 65%
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
12. PROJECTION SYSTEMS
1. First angle system
2. Third angle system
First Quadrant
Third
Quadrant
- European country
- ISO standard
- Canada, USA,
Japan, Thailand
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
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