mech 211 - lecture 1
TRANSCRIPT
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Lecture 1
Introduction
Time: M _ W _ _ 10:15 - 11:30
Credits: 3.5 Session: Fall 2013
MECH 211, MechanicalEngineering Drawing
WELCOME TO
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Whatever area you will
choose…
This course is fundamental.
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A bit of history• The objective need to communicate
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A bit of history
• The time line
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History in images
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“Paper could take about
anything”
Observe the waythe posts are crossing
Have you ever seen
such a construction?
Artistic Drawing
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The fundamental difference ?
Artistic Drawing Mechanical/Technical drawing
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Introduction to graphic language and design — means and
techniques. The third and the first angle projections.
Orthographic projection of points, lines, planes and solids.
Principal and auxiliary views. Views in a given direction.
Sectional views. Intersection of lines, planes and solids.
Development of surfaces. Drafting practices. Dimensioning,
fits and tolerancing. Computer-aided drawing and solidmodelling. Working drawings — detail and assembly
drawing. Design practice. Machine elements representation.
Case Study
Content of the Course
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A, B, C, D ARE POINTS
B
D
C
A
Content of the Course
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AB, BC, CD, DA, CA ARE LINES
A, B, C, D ARE POINTS
B
D
C
A
Content of the Course
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ABC, CDA ARE PLANES
AB, BC, CD, DA, CA ARE LINES
A, B, C, D ARE POINTS
B
D
C
A
Content of the Course
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ABCD IS A SOLID
ABC, CDA ARE PLANES
AB, BC, CD, DA, CA ARE LINES
A, B, C, D ARE POINTS
B
D
C
A
Content of the Course
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ABCD IS A SOLID
ABC, CDA ARE PLANES
AB, BC, CD, DA, CA ARE LINES
A, B, C, D ARE POINTS
B
D
C
A
CASE
STUDY
INTERSECTION
ISOMETRICPERSPECTIVE
D E V
E L O P
M E N
T
P A R A
L L E L
P R O J E C T I O N
T E C H N I
C A L
A R T I S T I C
EXPLAIN
WITH TEXT
COMMUNI
CATION GRAPHICS
Content of the Course
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• Enables the students to learn the techniques andstandard practices of technical graphics
• At the end of the lectures, one would be able to:
– Read a working or assembly drawing (blueprint)
– Represent mechanical components in multiview orthographic
representation
– Create conceptual design sketches
– Create assembly drawings (limited)
– Capability to use AutoCAD for 2-D representations
* The amount of acquired skills will be proportional to the capabilities, will and effort of the individuals
Mission of the Course
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• To acquire essential skills that are part of the mechanical
engineering practice
• To be able to communicate with other mechanical
engineering professionals regardless their spoken
language
• To be able to communicate with manufacturers ofmechanical systems
Main Objective of the Course
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• 3 teaching hours/week M-W-- 10:15 –11:30
• 12 weeks and one Review week
• 2 hour of tutorial – following the class
• 4 hours of laboratory – every 4 Weeks
• 3 parallel sections
Class Logistics
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Required textbook Recommended textbook
Class Materials
http://users.encs.concordia.ca/~nrskumar
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• Tutorial materials – handed in during tutorial periods, also available
on the web. Tutorials will be held in AUTOCAD labs and set of
practicing drawings available on the web site to learn AUTOCAD
• Assignments: 8 – available on the internet
• Solutions to the assignments will be with PODs after assignment
due date
• RECOMMENDATION: Attend the classes!
Class Materials
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Class MaterialsLect
#
Textbook
Chapter
Description
1 1, 6 Introduction to graphic language and design, means and techniques, views of ageometric object, multiview projections, applications and examples -,
2 2, 3, 4 Instruments, geometric constructions, CAD tools, demonstration examples -,
3 5, 7, 8, 10 Sketching and shape description, shape generation, sectional and auxiliary views,examples and applications -,
4 19 Descriptive Geometry – Points and lines, examples - 5 19 Descriptive Geometry – Points and lines, examples -,
6 20 Descriptive Geometry – Parallelism & perpendicularity – examples -,
7 21 Descriptive Geometry – Solids in space and Intersections – examples -,
8* 21, 22 Descriptive Geometry – Intersections, examples, ,
9 22 Descriptive Geometry – Developments, examples, -,
10 11, 12 Dimensioning and tolerancing, examples and applications -, 11 13 Threads, fasteners, springs, gears, examples -,
12 14 Design and working drawings – examples, Design case study -,
13 ---- Makeup class, Review – ,
* During the tutorial period of week # 8, the midterm test will be carried
- PowerPoint presentation, - Material available on course website, Lecture to be done on board/screen
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Class Instructor and Contacts
Instructor: Dr. S. Narayanswamy
Office: EV Building
Room: 004 –124
Phone: 848-2424 (7923)
Office Hours: _ _ _ J _ 10:00 –12:00 or by appointment
e-mail: [email protected]
Course Web Site: http://users.encs.concordia.ca/~nrskumar /
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What you have to do
• Attend the lectures, laboratories and tutorials – try to understand theobjectives as well as the procedures
• Use time at home to read and study the chapters in the book – use
the material posted on the internet
• Do your home-work by yourself – consult only your colleagues, tutor,
lab instructor or class instructor
• Submit on time your assignments
• Write the midterm test – this is a good measurement means for your
performance in the class
• Write the final exam with confidence that you will do very well
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Midterm Exams
• Scheduled for October 28th, 2013 and it will be
conducted during the tutorial period.
• The midterm test is not mandatory but is
recommended
• If the midterm result is better than the final, it will
be counted for 10% towards final grade.
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• There is lab component to this course
• You will be learning about few machineries
• There are four of them done in H-1067once 4 weeks (4 hours a week).
• Safety is important and the details are
available in the course outline.
Laboratory
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Content of the first lecture
• Graphics as communication means• A bit of history
• Multiview representation and orthographic
projections
• Technical procedures
• How to generate multi-view orthographic
projection
• Representation rules
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Mechanical components
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• http://www.webshots.com/g/55.html
In Nature
In Human Need
is a fundamental thing!
Geometry
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Introduction
• Why graphics is necessary?
– Communicate information that would not be possible to exchange
in writing
• Why not use pictures to communicate visual information?
– Usually, a drawing represents something that exists just at
conceptual level
• Why not use pictorial representation?
– The information contained in a drawing must be used to build an
accurate component/system.
to Graphic Language and Design
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• Drawing is a graphic representation of a real
thing, an idea, or a proposed design
• Why graphic representation?• Graphic method of representation is a basic
natural form of communication of ideas that is
universal and timeless.
• It is impossible to explain things through text.
What is Drawing?
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• How hard todefine in words?
• Try to describe in words the
following representation: A
MECHANISM
A simple component!
Graphic Language
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Graphic Language
• Graphics language is universal
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Graphic Language
• The information can be conveyed regardless the
spoken language
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3. ®@µ¶œƒ/ 6. € ¶¸¹ì±®wd]Ê !;8 9. €ßu $*” éÐÐ
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Graphic Language
• When spoken language is known, the information is moreaccurate
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Essentials of a good drawing
• Should represent the concept/idea/geometry
clearly
• Should be able to communicate with others without doubt
• Should respect the manufacturing feasibility
• Should favor a lot standardization
Let’s see how to make a good mechanical drawing!
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Views
• An object could be represented in more ways:
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Projections/ Drawing Basics
• The way one is visualizing an object
(Simple and sufficient)
• Two basic projection types – use parallel
projection
Perspective Parallel
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• Representation of objects based on the rule of distance: 2identical object are seen different from different distances
– shape is deformed too
• This type of representation is not used for technical
purposes in Mechanical Engineering
What is perspective representation
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What should be drawn?
• What is seen – follow certain rules
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Project the visible and hiddenedges/corners
Views - Multi-view representation
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Views - Multi-view representation
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Multi-views
• A part is represented in multiple views (a single part is
seen as more than one part)
• The representation makes the user to fully understand
the shape of the part, to perceive the relative proportions
of the geometric features and to position the features one
with respect to another
• The parallel projection principle and the alignment of the
features is used in the representation
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Type of Projections
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Projection planes
• The component is aligned withrespect to the principal projection
planes
– Top (T) or Horizontal (H)
– Front (F) or Vertical (V)
– Side (S) or Profile (P)
• The projection is carried such that
each feature parallel to the
projection planes to be seen as true
length
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Object orientation
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Projection principles
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R l i i i f h i
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Relative position of the views
• All views must be aligned with respect toeach other – feature to feature
D fti t t i (3 i )
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Drafting strategies (3 view)
T h i l d
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Technical procedures
• When representing the third view, scale, divider of
miter line is used to ensure the alignment of the
three views
E l
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Example
• Represent the shown component using multipleview representation
E l
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Example
• Start with the front view
• The edge C cannot be seen but is
represented by a dashed line (hidden
feature)
C
E l
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Example
C
• Align the top view with respect to thefront view
E l
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Example
• Complete the representation• Later, dimensioning and comments will
be added to the drawing
Th i i l j ti l
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The principal projection planes
• The object should
be aligned withrespect to the
projection planes
Th i i l j ti l
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The principal projection planes
• Notice the relationship
between the features
• The depth – distance
from the front to the
object is measured in
the Horizontal and
Profile
- unfolded
M lti i P j ti D i
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Multi-view Projection Drawing
• Assume the given part as
shown besides.
• Position the part in a
convenient way, to simplify
the representation as much
as possible
How to generate
M lti i P j ti D i
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• Select the position of theprojection planes
• Start with one of the
projections – usually the front
view
• Each edge is represented
based on the principle of the
parallel projection
Multi-view Projection Drawing
How to generate
M lti i P j ti D i
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• Complete the first view.
• Use the basic representation
Principles:
• visible edge is seen as a full
line
• non-visible feature is
represented by a dash-line
• axes of symmetric features
are represented by dash-dot
lines
Multi-view Projection Drawing
How to generate
M lti ie Projection Dra ing
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• Continue with the second view • Make sure that you have
accurately align the two views.
• Use the same rules for
representation.
• The alignment lines must be
perpendicular to the edge of
the projection planes
• (The lines of sight are always
perpendicular to the fold line).
Multi-view Projection Drawing
How to generate
Multi view Projection Drawing
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• Continue with the third view
• Make sure that you have
accurately align all views.
• Use the same rules for
representation.
• The alignment lines must be
perpendicular to the edges of
the projection planes
• (The lines of sight are always
perpendicular to the
corresponding fold lines).
Multi-view Projection Drawing
How to generate
Multi view Projection Drawing
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• Complete the representation
• Separate the top from the
profile view along the edge
(fold line)
• Unfold the three views to lay
them on the same plane
Multi-view Projection Drawing
How to generate
Multi view Projection Drawing
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• This is the 3-view
orthographic representation
of the selected part(FLANGE)
• * Do not erase any of the
lines when writing a test
Multi-view Projection Drawing
How to generate
Orthographic multi view
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Orthographic multi-view
• The above part will be projected on all 6
projection planes
Orthographic multi view
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Orthographic multi-view
Orthographic multi view
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Orthographic multi-view
Orthographic multi view
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Orthographic multi-view
Orthographic multi view
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Orthographic multi-view
Orthographic multi view
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Solid models
Orthographic multi-view
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Centerline
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Centerline
• Axi-symmetric features are indicated with adash-point line - CENTERLINE
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Hints on understanding shapes
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Hints on understanding shapes
• Complex shapes could be generated using Boolean
operations
Pay attention to edges
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Pay attention to edges
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Projections and views (brief)
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Projections and views (brief)
Where drawing is used?
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Where drawing is used?
• It is important to know the rationale ofdrawing
• Drawing is an international communication
language
• Fast way to convey certain type of
information
• Limited number of concepts are betterrepresented by drawing, but not all
The design process
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The design process
• Drawings are created to represent partsthat do not exist yet
• The designed parts are intended to be
manufactured
• The drawings must carry all the necessary
information that enables the fabrication of
the part
The design process
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The design process
• Design involves constrained creation• Constraints:
• Technology limits
• Human and environment concerns
• Durability and reliability
• Cost
• Market requirements
• Etc.
The design process
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The design process
• REPRESENTATION
• PERCEPTION
• KNOWLEDGE
• INTUITION
• CONCEPT
• PURE CONCEPT
• EMPIRICAL CONCEPT
• NOTION
• IDEA
Basic requirements to be able to perform a design
All the above interacts in your judgment even if you are notaware of it
You have to train your judgment
to be able to perform solution-solving based thinking
The graphic helps you to do so
The design process
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The design process
• A design is created after analysis, fullunderstanding of requirements and
constraints and synthesis
• Two individuals may not come with the
same solution to the same problem• Example: Connect two straight pipes ND 4” to avoid
leaking of the gas and to permit easy maintenance
of the segment
Solutions to the problem
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Solutions to the problem
• Multiple: flanges, clips, clamps, seals, etc.
The design process
1 Problem Defn
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Concurrent engineeringapproach
The design process2 Concept and
ideas
3 Solutions
4 Models/Prototype
5 Production and
working drawings
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The design process
Th d i
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The design process
Drawings in productd l
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development
Mechanical
Engineer
Vendors/
Customers
Quality
Assurance
Production
Shops
Assembly
Designer
Sketches F u n c t i o n a l
D r a w i n g s
P r o d .
d r a w i n g s
Assembly
Drawings
Assembly
Drawings
Drawings in productd l t
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development
A Component !
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A Component !