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Computarized Engineering Graphics ENGR 2220. Professor: Dr. Omar E. Meza Castillo [email protected] http://facultad.bayamon.inter.edu/omeza Department of Mechanical Engineering Inter American University of Puerto Rico Bayamon Campus. Syllabus.

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Computarized engineering graphics engr 2220

Computarized Engineering Graphics ENGR 2220

Professor: Dr. Omar E. Meza Castillo

[email protected]

http://facultad.bayamon.inter.edu/omeza

Department of Mechanical Engineering

Inter American University of Puerto Rico

Bayamon Campus


Syllabus
Syllabus

  • Catalog Description: Graphic terminology. Analysis and solutions of spatial problems. Symbols and standards as applied to engineering. Introduction to computer graphics: hardware and software. Mathematical elements in two or three dimensions for computer graphics. Object visibility. Use of programs for computer-aided design in engineering.

  • Prerequisites: GEIC 1000 – Information and Computer Literacy and GEMA 1200 – Fundamentals of Algebra .

  • Course Text: Bertoline, G R, Wiebe, E, Miller, C. Fundamentals of Graphics Communications. 5th, Mc Graw-Hill. 2006 .


Syllabus1
Syllabus

  • Absences: On those days when you will be absent, find a friend or an acquaintance to take notes for you or visit the web page. Do not call or send an e-mail the instructor and ask what went on in class, and what the homework assignment is.

  • Homework assignments: Homework will be collected when due, with your name written legibly on the front of the title page. It is graded on a 0 to 100 points scale. Late homework (any reason) will not be accepted.

  • Quiz : There are several quizzes during the semester.

  • Partial Exams and Final Exam: There are three partial exams during the semester, and a final exam at the end of the semester.


Course grading
Course Grading

  • The total course grade is comprised as follows:

    • Sketching Assignments 10%

    • Quiz 10%

    • Computer Projects 30%

    • Exam 1, Exam 2 and Exam 3 30%

    • Final Exam 20%

    • 100%

  • Cheating: You are allowed to cooperate on homework by sharing ideas and methods. Copying will not be tolerated. Submitted work copied from others will be considered academic misconduct and will get no points.


Course materials
Course Materials

  • Most Course Material (Power Point Lectures and homework) will posted every week or two on Web Page of the course ENGR 2220:

    http://facultad.bayamon.inter.edu/omeza/

  • Office Hours: Tuesday and Thursday @ 5:50 to 7:20 PM, at G-235

  • Contact Email: [email protected]

  • Materials:

    • Architectural scale, Compass, Triangles Rules, Stainless Steel Ruler, Protractor, Pencils HB-2H-2B and Isometric paper.


Course objectives
Course Objectives

  • Upon successful completion of the course, the student will be able to:

    • Identify types of software and hardware used for computer-aided design.

    • Clearly represent and control mental images.

    • Graphically represent technical designs, using accepted standard practices.

    • Use plane and solid geometric forms to create and communicate design solutions.

    • Describe the engineering design process.

    • Understand concepts and applications of 3-D modeling.

    • Understand the theory, techniques and standards of multiviews.

    • Apply the concept of cutting planes to create section views and sectioned 3-D .CAD models.

    • Apply the standard dimensioning practicing for mechanical drawings.

    • Apply tolerances to dimensions



Reference
Reference

  • Bethune, James. Engineering Graphics with AutoCAD 2009, Prentice Hall, 2009.

  • Earle James. Engineering Design Graphics, 11th Ed., Pearson Prentice Hall. 2005.


Graphics communication

"Lo peor es educar por métodos basados en el temor, la fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Einstein Albert

Chapter 1: Introduction

Graphics Communication


Development of engineering graphics
Development of Engineering Graphics fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Multiview Drawings

Francesca (1420-92)

Cartesian Coordinates

Descartes (1596-1650).


Engineering is 92 graphically based
Engineering is 92% graphically based. fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”


Engineering drawing
Engineering Drawing fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

The engineering drawings are used to communicate and document the design process.


What you will learn
What you will learn fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

  • Visualization

  • Graphics Theory

  • Standards

  • Conventions

  • Tools

  • Applications


The language
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Lines may be defined as…….

  • A series of points in space organized in a rational order

  • 2. The shortest distance between two points

  • 3. The geometry created by the intersection of two planes or surfaces

  • 4. A set of points organized that have length and direction, but no thickness


The language1
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Lines come in all types and shapes:

Parallel lines will always maintain the same distance from each other throughout their entire length, and NEVER touch!


The language2
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Lines come in all types and shapes:

Non-parallel lines do not maintain the same distance from each other throughout their entire length, and may either touch, or eventually cross each other.


The language3
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Lines come in all types and shapes:

Perpendicular lines are at 90 degrees to one another.


The language4
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Lines come in all types and shapes:

Intersecting lines cross each other at any angle.


The language5
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Lines come in all types and shapes:

Tangent lines are created when:

1. A curved and straight line meet, and….

2. The two lines intersect at only one point, and….

3. A smooth transition into one line can be generated.


The language6
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Lines come in all types and shapes:

Lines will appear as edges when there is an intersection of two planes or surfaces.


The language7
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Lines come in all types and shapes:

Tangent conditions may appear in both 2D and 3D geometry….

Figure A shows a tangent being created at Point C

Figure B shows Tangent F being identified as the intersection point between the 2 circles.


The language8
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Lines come in all types and shapes:

Here we can see that Line VT is lying tangent to the cone.


The language9
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Lines come in all types and shapes:

Can you explain why Example A is tangent, but Example B is not??


The language10
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Circles are considered the most perfect form geometric shape. All circles are made up of many parts…


The language11
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

A parabola’s shape can be generated from a 3D cone and 2D plane…

Notice that the parabola’s shape is symmetrical (mirror image of itself), and that it has a focus point inside the arc of the line. The cutting plane is always parallel to the slope of the cone.


The language12
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Parabolas have many engineering uses and shapes…

As the shape of the curve of the parabola changes, it allows for more diverse applications.


The language13
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

The ellipse is generated in much the same way as the parabola…

Notice that the ellipse’s shape is symmetrical (mirror image of itself), like the parabola.

However, the ellipse has no focus point identified inside the arc of the line, and the cutting plane is NOTparallel to the slope of the cone.


The language14
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

A circle may appear as an ellipse when the object is not perpendicular to the line of sight.

While the circle’s geometry remains true shape and size, our view of its shape appears more oval as the object is rotated from its 90 degree position.


The language15
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Lines can be set at angles to points or other lines…

Lines set at angles help us understand the relationship of other lines, or the geometry’s position in space.


The language16
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Quadrilaterals have two main characteristics:

  • They are CLOSEDentities,

  • 2. They have 4 sides.


The language17
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Polygon means “many sided”:

Most polygons have names based on the number of sides they have.


The language18
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

2D and 3D Space:

Let’s take a few minutes to see how lines and points are used to organize space…..


The language19
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

If we take the centre of the universe as our home position (X=0 and Y=0) , we are able to map out the coordinate vertices of any object from that point and assign them addresses so they may be easily located.


The language20
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

However, as the universe is not 2-dimensional, we must take into consideration a 3rd axis (Z) that represents its volume.


The language21
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

However, as the universe is not 2-dimensional, we must take into consideration a 3rd axis (Z) that represents its volume.


The language22
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Since the computer ALWAYS remembers that its home is (0,0,0), we may locate any point in space, or on a 3D model, by referencing home.


The language23
The “Language” fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Each point on a 3D model has its own address in space that is designated by an X, Y, & Z value.

Here we can see the address of each vertex.

Example: (4, 3, 0)


Ansi standard sheet sizes
ANSI Standard Sheet Sizes fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”


Ansi standard sheet sizes1
ANSI Standard Sheet Sizes fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”


Mechanical pencils
Mechanical Pencils fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”


Pencil grades
Pencil Grades fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”


Pencil grades1
Pencil Grades fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”


Isometric paper
Isometric Paper fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”


Triangle rulers
Triangle Rulers fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”


Architect s scales
Architect’s Scales fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”


Isometric drawing
Isometric Drawing fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Isometric drawing is made up of a series of parallel vertical lines and parallel 30 degree lines.


Isometric crating
Isometric Crating fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”

Crating is a term used for cutting away from a shape. The easiest shape to draw is a block and this can serve as a guide and will give the overall size of the object to be drawn. Below is an example of a step shape being drawn in a guide block.


Can you accurately draw the shapes below in isometric
Can you accurately draw the shapes below in isometric? fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión”


Homework1 fuerza, la autoridad, porque se destruye la sinceridad y la confianza, y sólo se consigue una falsa sumisión” WebPage

Due, Thursday, February 02, 2012

Omar E. Meza Castillo Ph.D.


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