Lesson Plan
Course Title: Manufacturing Engineering
Session Title: Introduction to Computer-Aided Design (CAD)
Performance Objective:
After completing this lesson, students will be able to demonstrate they have a basic understanding
of computer-aided design software programs used in Manufacturing Engineering and how to
create basic computer-aided design images that match the criteria in the Quiz Project (CAD
Automobile) Rubric.
Specific Objectives:
 Discuss the purpose of computer-aided design software programs.
 Identify the control commands in a computer-aided design software program.
 Discuss basic terms and definitions that are used in a typical computer-aided design
software program.
 Construct basic computer-aided design images using a typical computer-aided design
software program.
Preparation
TEKS Correlations:
This lesson, as published, correlates to the following TEKS. Any changes/alterations to the
activities may result in the elimination of any or all of the TEKS listed.
Manufacturing Engineering:

130.329(c)(3)(A)
...use computer-aided design software to complete a project;
Interdisciplinary Correlations:
Physics:

112.39(c)(2)(A)(B)(C)(D)
...know the definition of science and understand that it has limitations, as specified in
subsection (b)(2) of this section;
...know that scientific hypotheses are tentative and testable statements that must be
capable of being supported or not supported by observational evidence. Hypotheses of
durable explanatory power which have been tested over a wide variety of conditions are
incorporated into theories;
...know that scientific theories are based on natural and physical phenomena and are
capable of being tested by multiple independent researchers. Unlike hypotheses,
Copyright © Texas Education Agency, 2012. All rights reserved.
1 scientific theories are well-established and highly-reliable explanations, but may be
subject to change as new areas of science and new technologies are developed;
...distinguish between scientific hypotheses and scientific theories;

112.39(c)(3)(D)
...explain the impacts of the scientific contributions of a variety of historical and
contemporary scientists on scientific thought and society;
English Language Arts and Reading, English I:

110.31(b)(1)(E)
… use a dictionary, a glossary, or a thesaurus (printed or electronic) to determine or
confirm the meanings of words and phrases, including their connotations and denotations,
and their etymology,

110.31(b)(12) - Reading/Media Literacy. Students use comprehension skills to analyze
how words, images, graphics, and sounds work together in various forms to impact
meaning.

110.31(b)(19) - Oral and Written Conventions/Spelling. Students spell correctly.
Students are expected to spell correctly, including using various resources to determine
and check correct spellings.

110.31(b)(24)(A) - Listening and Speaking/Listening. Students will use comprehension
skills to listen attentively to others in formal and informal settings...
…listen responsively to a speaker by taking notes that summarize, synthesize, or highlight
the speaker's ideas for critical reflection and by asking questions related to the content for
clarification and elaboration;

110.31(b)(25) - Listening and Speaking/Speaking. Students speak clearly and to the
point, using the conventions of language... Students are expected to give presentations
using informal, formal, and technical language effectively to meet the needs of audience...;
Occupational Correlation: (reference: O*Net – www.onetonline.org)
Mechanical Engineers 17-2141.00
Similar Job Titles: Fuel Cell Engineers, Automotive Engineers
Tasks:
 Read and interpret blueprints, technical drawings, schematics, or computer-generated
reports
 Assist drafters in developing the structural design of products using drafting tools or
computer-assisted design (CAD) or drafting equipment and software
Soft Skills: Critical Thinking; Problem Solving; Operations Analysis
Copyright © Texas Education Agency, 2012. All rights reserved.
2 Teacher Preparation:
Teachers should review the Matching Definitions handout and Introduction to Computer-aided
Design (CAD) presentation and notes. Teachers are also encouraged to conduct their own
research on lesson material. The teacher will need to select the computer-aided design software
to be used in this lesson, and show videos or photos of computer-aided design images
of finished products like automobiles, buildings and mechanical parts.
References:
1. Occupational Network, General Domains,
http://www.onetonline.org/link/summary/17-2141.00 (2011)
Instructional Aids:
1. Introduction to Computer-aided Design (CAD) presentation and notes
2. Matching Definitions handout and answer key
3. Warm-up Activity (slide 3)
4. Practice Project (CAD Shape) handout
5. Quiz Project (CAD Automobile) handout
6. Quiz Project (CAD Automobile) Rubric
Materials Needed:
1. Matching Definitions handout for each student
2. Practice Project (CAD Shape) handout for each student
3. Quiz Project (CAD Automobile) handout for each student
4. Quiz Project (CAD Automobile) Rubric for each student
5. Pen or pencil
6. Paper
Equipment Needed:
1. Computer with CAD software program installed
2. Internet access (optional)
3. Overhead projector
Learner Preparation:
Students must have basic computer skills and be familiar with a Windows operating environment.
Introduction
Introduction (LSI Quadrant I):
SAY: Having a basic understanding of computer-aided design software will contribute to your
career success.
ASK: How many of you like to draw with pencil and paper or on a computer?
SHOW: Videos or photos of computer-aided design images.
SAY: Computer-aided design software programs give you the ability to create precise,
Copyright © Texas Education Agency, 2012. All rights reserved.
3 2 dimensional and 3 dimensional digital images.
ASK: How beneficial will it be for you to have the ability to create a digital portfolio of
your work to email to potential employers or upload to your own website?
SHOW: Photos of 2 dimensional and 3 dimensional computer-aided design images and finished
products like automobiles, buildings and mechanical parts.
Outline
Outline (LSI Quadrant II):
Instructors can use the presentation, slides, handouts, and note pages in conjunction with the
following outline.
MI
Outline
Notes to Instructor
I.
Introduction
A. Introduction to computer-aided
design
B. Bell Work Activity
C. Warm-up Activity
Begin Introduction to
Computer-aided Design
presentation.
Bell Work Activity - Slide 2:
have students work on the Bell
Work Activity.
Warm-up Activity - Slide 3:
Using the Matching Definitions
handout, students will pairshare and teach each other
the terms and definitions. They
may do computer-based
research to look up the
meaning.
.
II.
Computer-aided design overview
A. Historical overview
B. Technical drawings
Discuss the historical
importance having written
drawings for building, bridge
construction, etc.
Slides 4-5
III.
Computer-aided design software
A. Software program
B. Software installation/ download
Discuss the evolution of
technical drawings into
computer-aided design;
and the impact of digital
computer-aided design
software on the drafting
industry. Discuss various
computer-aided design
software programs available
for purchase or download.
Slide 6
Copyright © Texas Education Agency, 2012. All rights reserved.
4 Verbal
Linguistic
IV.
Computer-aided design software
program operational principles
A. Sample pages
B. Software command buttons
Each slide is meant to be
discussed. Study the
computer-aided design
software program. Have some
background knowledge, and
challenge the students to make
contributions to the discussion.
Slides 6-9
V.
Computer-aided design software
program projects
A. Practice Project (CAD Shape)
B. Quiz Project (CAD Automobile)
Discuss the location and use of
command button.
Demonstrate the use of each
button to the class.
Slides 10-11
Distribute Practice Project
(CAD Shape) and
Quiz Project (CAD Automobile)
handouts for each student.
Have each student complete
the assigned projects.
VI.
Complete Quiz Project (CAD
Automobile) based on the criteria in
the rubric
Slide 11
Using a computer-aided
design software
program, students will
complete the Quiz Project
(CAD Automobile) and include
the line type, colors, and text
as shown on the example,
matching the criteria in the
Quiz Project (CAD
Automobile) Rubric.
Logical
Mathematical
Visual
Spatial
Musical
Rhythmic
Bodily
Kinestheti
Intrapersonal
Interpersonal
Naturalist
Existentialist
Application
Guided Practice (LSI Quadrant III):
The teacher will guide the discussion when presenting the Introduction to Computer-aided Design
Copyright © Texas Education Agency, 2012. All rights reserved.
5 (CAD) presentation. Using Matching Definitions handout, the teacher will allow the students to
pair-share and teach each other the terms and definitions. They may do computer-based research
to look up the meaning.
Independent Practice (LSI Quadrant III):
Students will complete Bell Work Activity and Warm-up Activity, doing computer-based research
to look up and match the meaning of words on the handout, writing out definitions on a sheet of
paper. Students will complete the Practice Project (CAD Shape) and the Quiz Project (CAD
Automobile) matching the criteria in the Quiz Project (CAD Automobile) Rubric.
Summary
Review (LSI Quadrants I and IV):
Question: Why is it necessary to create technical drawings before creating structures and
products?
Answer: Technical drawing allows for precise measurements and consistent sizes.
Question: What are 2 advantages of computer-aided design drawings versus hand drawings?
Answer: The ability to store and share drawings digitally and low cost.
Question: Do you have to have knowledge of computer programming to use computer-aided
design software programs?
Answer: No, most computer-aided design software programs are very user friendly.
Evaluation
Informal Assessment (LSI Quadrant III):
Oral question/answer. Students will complete definitions teacher has on the board from terms in
the definitions handout.
Formal Assessment (LSI Quadrant III, IV):
Students will complete Matching Definitions handout and Quiz Project using CAD software
program, matching the criteria in the Quiz Project (CAD Automobile) Rubric.
Extension
Extension/Enrichment (LSI Quadrant IV):
1. Students can work in groups to brainstorm an idea for a new product and use the
computer-aided design software program to create a drawing of it.
2. Students can conduct research and gather data on 3 computer-aided design programs
currently used in industry, then create a report to discuss the strengths and weaknesses
of each program to present during class.
Copyright © Texas Education Agency, 2012. All rights reserved.
6 Name: ________________________________Date: ________________Class:______
Manufacturing Engineering
Introduction to Computer-aided Design (CAD)
Matching Definitions Directions: Match the terms in Section 1 with the definitions in Section 2. Section 1: A. File Menu: B. Draw Menu: C. Edit Menu: D. Help Option: Draw Options E. F. ‐ Circle Command: G. ‐ Ellipse (Oval): H. ‐ Line: ‐ Arc Commands: I. ‐ Polyline: J. ‐ Arrow: K. ‐ Rectangle: L. ‐ B‐Spline: Copyright © Texas Education Agency, 2012. All rights reserved.
7 Edit Options M. ‐ Copy: N. ‐ Text: O. ‐ Delete: P. ‐ Move: Window Options Q. ‐ Zoom all: R. ‐ Zoom in / out: Settings S. ‐ Default Layer Copyright © Texas Education Agency, 2012. All rights reserved.
8 Section 2: 1. _______allows you to create arcs by any three points. 2. _______gives the user the ability to create line arrows to point out details for call outs or labeling. 3. _______gives the user the ability to create single line inputs. 4. _______contains a variety of edit options to copy, delete, move, rotate or add text to images. 5.________contains a list, images and explanations of all standard software program commands. 6. _______allows you to create circles by any two points. 7. _______contains commands to: open, create, print, save or exit a new drawing. 8. _______allows you to create an ellipse by any three points. 9. _______provides pull‐down access to all drawing commands to create shapes and images on the screen. 10. _______allows you to create a multiple sided (poly) line. 11. _______gives the user the ability to move elements from one point in 2D space to another. Copyright © Texas Education Agency, 2012. All rights reserved.
9 12. _______an extension of the line command that allows you to draw boxes while only entering two points. 13. _______lets you select the color layer (for line colors) on your page. 14_______lets you copy elements from one point in 2D space to another. 15. _______lets you delete one or many elements from your page. 16. _______lets you zoom out to view the entire paper limits. 17. _______zooms closer to / farther from, the center of the display. 18. _______allows you to input a series of points that create a continuous line with curves and arcs. 19. _______gives the user the ability to create and insert text at any angle. Copyright © Texas Education Agency, 2012. All rights reserved.
10 Manufacturing Engineering
Introduction to Computer-aided Design (CAD)
Matching Definitions Key 1. E. ‐ Arc Commands: allows you to create arcs by any three points. 2. J. ‐ Arrow: gives the user the ability to create line arrows to point out details for call outs or labeling. 3. H. ‐ Line: gives the user the ability to create single line inputs. 4. C. Edit Menu: contains a variety of edit options to copy, delete, move, rotate or add text to images. 5. D. Help Option: contains a list, images and explanations of all standard software program commands. 6. F. ‐ Circle Command: allows you to create circles by any two points. 7. A. File Menu: contains commands to: open, create, print, save or exit a new drawing. 8. G. ‐ Ellipse (Oval) ‐ allows you to create an ellipse by any three points. 9. B. Draw Menu: Provides pull‐down access to all drawing commands to create shapes and images on the screen. 10. I. ‐ Polyline: allows you to create a multiple sided (poly) line. Copyright © Texas Education Agency, 2012. All rights reserved.
11 11. P. ‐ Move: gives the user the ability to move elements from one point in 2D space to another. 12. K. ‐ Rectangle: an extension of the line command that allows you to draw boxes while only entering two points. 13. S. ‐ Default Layer: lets you select the color layer (for line colors) on your page. 14. M. ‐ Copy: lets you copy elements from one point in 2D space to another. 15. O. ‐ Delete: lets you delete one or many elements from your page. 16. Q. ‐ Zoom all: Lets you zoom out to view the entire paper limits. 17. R. display. ‐ Zoom in / out: zooms closer to / farther from, the center of the 18. L. ‐ B‐Spline: allows you to input a series of points that create a continuous line with curves and arcs. 19. N. ‐ Text: gives the user the ability to create and insert text at any angle. Copyright © Texas Education Agency, 2012. All rights reserved.
12 Name: ________________________________Date: ________________Class:______
Manufacturing Engineering
Introduction to Computer-aided Design (CAD)
Practice Project (CAD Shape) Directions: Using a computer‐aided design software program, draw the following shapes, and include the line type, colors and text shown below. Copyright © Texas Education Agency, 2012. All rights reserved.
13 Name: ________________________________Date: ________________Class:______
Manufacturing Engineering
Introduction to Computer-aided Design (CAD)
QUIZ Project (CAD Automobile) Directions: Using a computer‐aided design software program, complete the following automobile project, and include the line type, colors and text shown below. Copyright © Texas Education Agency, 2012. All rights reserved.
14 Quiz Project (CAD Automobile) Rubric
Task Statement: Construct a 2 Dimensional Drawing.
Task Assignment: Construct a 2 Dimensional Drawing that accurately and neatly meets the specifications in the CAD Automobile Drawing Project in this lesson
by using pencil and then CAD.
Concepts/Skills to be Assessed
Lay out overall shape, length, and
height in pencil then CAD
Novice
1
Pencil sketch started
Criteria Categories
(Novice to Exemplary)
Developing
Accomplished
2
3
Pencil Sketch completed
Pencil and CAD lines
going in the right direction
(Possible 15 points)
Lay out overall shape to
dimensions in pencil then CAD
(1-4 points)
Pencil sketch started
(4-8 points)
Pencil Sketch completed
(8-10 points)
Pencil and CAD lines
going in the right direction
(Possible 15 points)
Dimension length of line segment
in pencil then CAD
(1-4 points)
Line segments not
connected, double lines,
over run corners
(4-8 points)
Less line segments not
connected, less double
lines, less over run
corners
(8-10 points)
Lines and shapes are
proportional, connected,
sharp, and intersect
(Possible 15 points)
Dimension height of line segment
in pencil then CAD
(1-4 points)
Line segments not
connected, double lines,
over run corners
(4-8 points)
Less line segments not
connected, less double
lines, less over run
corners
(8-10 points)
Lines and shapes are
proportional, connected,
sharp, and intersect
(10-15 points)
Dark, sharp lines with
100% accuracy and color
(Possible 15 points)
Finish drawing, as shown, in
pencil then CAD
(1-4 points)
Pencil sketch started
(4-8 points)
Pencil Sketch completed
(8-10 points)
Pencil and CAD the
component names with
indicating arrows on the
drawing
(10-15 points)
Pencil and CAD are 100%
accurate within
specifications given
(Possible 25 points)
Neatness
(1-10 points)
Smudges, double lines,
light and fuzzy lines
(14 to 16 points)
No smudges, lines
intersect and are dark and
sharp
(8-10 points)
(16 to 25 points)
Dark, sharp, accurate lines
(10 to 14 points)
Less smudges, few
double lines, less over
run
(Possible 15 points)
(1-4 points)
(4-8 points)
A = 66-100 points; B = 54-66 points; C = 30-54 points; D = 6-30 points
Copyright © Texas Education Agency, 2012. All rights reserved.
Exemplary
4
Pencil and CAD are
accurate within 1/16 of an
inch
(10-15 points)
Pencil and CAD are
accurate within 1/16 of an
inch
(10-15 points)
Dark, sharp lines with
100% accuracy and color
(10-15 points)
15 Points
Earned
Total Points: ________ 1
Discuss the importance of consistent precision measurement, drawings and
plans in the production and manufacturing process.
2
Definitions make a great warm up activity. Have
the class complete the Matching Definitions handout.
3
NOTES:
Drafting Methods
Sketching: A freehand drawing, not to be used as finished work. It gives an architect
a way to record an idea for use in the future.
Manual or Instrument: Using instruments like a drawing board and drafting paper,
a technical pen, a T-Square (straight edge), a compass, stencils, drafting templates
and various other tools to create the shapes and images required to communicate
the specifications needed for the project.
Computer-aided Design (CAD): Using computer software to replace the manual
instruments so the drawing can be created in a 2 or 3 dimensional digital format.
CAD allows the drawing to be created faster and used on the internet. CAD programs
are user friendly and have drastically reduced the need for the use of manual
Draftsmen.
4
NOTES:
CAD is used in the modern design of tools, machinery and in the drafting and design
of all types of buildings, from residential (houses) to large commercial and industrial
structures (hospitals and factories).
CAD is mainly used for detailed engineering of three dimension (3D) models or
two dimension (2D) drawings of physical components, but it is also used throughout
the engineering process from conceptual design and layout of products, through
strength and dynamic analysis of assemblies to definition of manufacturing methods
of components. It is also used to design objects and household products.
5
6
7
This is the layout of a typical CAD Screen. Use it to get familiar with the basic program
commands. The commands use the standard click and draw format used in most Windows
applications. Use the Help function to gain a better understanding of the program commands.
Typical CAD Command Terms
(From the Help Tab)
NOTE: File, Draw, and Edit options available on the pull down menu on
the top, left side of the screen are also available as File, Draw and Edit options on the right
side of the screen as well.
A. File Menu: Contains commands to: open, create, print, save or exit a new drawing
B. Draw Menu: Provides pull-down access to all drawing commands to create
shapes and images on the screen.
C. Edit Menu: Contains a variety of edit options to copy, delete, move, rotate or
add text to images.
D. Select Menu: Gives the user the ability to select all or individual images
(entity) on the screen.
E. Undo Option: Gives the user the ability to undo the previous command.
F. Help Option: Contains a list, images and explanations of all standard program
commands.
(Notes continue on slide 9)
8
Draw Options: (Cont’d from slide 8)
G. Arc Commands: Allows you to create arcs by any three points
H. Circle Command: Allows you to create circles by any two points
I. Ellipse (Oval): Allows you to create an ellipse by any three points
J. Line: Gives the user the ability to create single line inputs
K. Polyline: Allows you to create a multiple sided (poly) line
L. Arrow: Gives the user the ability to create line arrows to point out details
for call outs or labeling
M. Rectangle: An extension of the line command that allows you to draw
boxes while only entering two points.
N. B-Spline: Allows you to input a series of points that create a continuous
line with curves and arcs.
Edit Options:
O. Copy: Lets you copy elements from one point in 2D space to another
P. Text: Gives the user the ability to create and insert text at any angle
Q. Delete: Lets you delete one or many elements from your page
R. Move: Gives the user the ability move elements from one point in 2D
space to another
Window Options:
S. Zoom all: Lets you zoom out to view the entire paper limits
T. Zoom in / out: Zooms closer to / farther from, the center of the
display.
Settings:
U. Default Layer: Lets you select the color layer (for line
9
colors) on your page
9
Review the information below with your class. Afterwards have them complete
images on the Shape Practice Project page above. Use the Help function to gain a better
understanding of the program commands. Have your class practice using the command
buttons to draw images. Some of the command buttons have unique functions. You must
practice them to become more familiar with their specific uses. Study the help menu to
increase your understanding. I will explain several unique functions below:
1.
Left Click the Rectangle, draw an image on the screen; Click the Undo button to remove it .
2.
Draw the rectangle again, Click the Select menu (at top of page), click on entity, then click
on the rectangle you’ve just created (the rectangle changes color to show that it is selected);
click the move button, left click and draw a line from the selected rectangle to another
location on the page and left click (the image should move to that location.)
3.
Draw a circle, select it, click on the copy button, left click and draw a line from the
selected circle to another location on the screen and left click (a new copy of the circle
should appear in the location.)
4.
To draw an Ellipse(Oval), you must left click on the button, left click to draw it, release
the left click and left click again to create the oval shape.
5.
You must select an image to copy, move, delete, rotate, etc.
6.
To change the line colors for your images, you must select a color from the layers
setting before drawing the image.
7.
To change the Line type (dashes, dots, straight line, etc.) select the line type from the
10
Line Type menu (top left side of the page), then choose the desired button form the
drawings option menu.
8.
Text: to insert text data, left click on the text button, select the desired size (1-5);
Enter text in the command line, click OK, double click on the screen in the area you
would like the text placed.
10
NOTES:
After reviewing and completing the information from the Practice Project (CAD
Shape) page, have your class complete the Quiz Project (CAD Automobile) above.
Use the Help function to gain a better understanding of the program commands.
11