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CE En 112 Engineering Drawing with CAD Application Chapter 1: Introduction to Graphics Communication Lecture Outline Introduction (1.1 – 1.5, 1.7) What will you learn? (1.9) Drawing tools (1.8) Media (1.8.2) Alphabet of lines (1.6) Scales (1.8.3 – 1.8.5) Next class

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ce en 112 engineering drawing with cad application

CE En 112 Engineering Drawing with CAD Application

Chapter 1: Introduction to Graphics Communication

lecture outline
Lecture Outline
  • Introduction (1.1 – 1.5, 1.7)
  • What will you learn? (1.9)
  • Drawing tools (1.8)
  • Media (1.8.2)
  • Alphabet of lines (1.6)
  • Scales (1.8.3 – 1.8.5)
  • Next class

Section numbers shown here apply to Chapter 1 of Textbook (B) from Bertoline-Wiebe-Miller “Fundamentals of Graphics Communication, 3/e)

introduction 1 1 1 5 1 7
Introduction (1.1-1.5, 1-7)
  • Engineers: People who use technical means to solve problems. They design products, systems, devices, and structures to improve our living conditions
  • Technical Drawings: a clear, precise language used in the design process for communicating, solving problems, quickly and accurately visualizing objects, and conducting analyses
  • A graphical representation of objects and structures is done using freehand, mechanical, or computer methods
introduction con t
Introduction (con’t)
  • 92% of the design process is graphical
  • The remaining 8% is mathematics and written communication

Breakdown of Engineer’s time

Who uses engineering graphics?

All aspects include graphics communication

Fig. 1.1

introduction con t5
Introduction (con’t)
  • Practice Exercise 1.1
    • Attempt to describe the part shown in this figure verbally to the person seatednext to you

Fig. 1.89

  • How easy is it to describe a part such as this without the use of graphics?
introduction con t6
Introduction (con’t)

An evolving design process:

  • Traditional: A linear, segmented activity involving problem identification, preliminary ideas, design refinements, analysis, optimization, and documentation
  • Concurrent: A team activity involving coordination of the technical and non-technical functions of design and manufacturing within a business

The CAD database becomes a communication medium.

Fig. 1.12

Fig. 1.14

Fig. 1.15

what will you learn 1 9
What Will You Learn? (1.9)

CE En 112

Manual Drafting

what will you learn con t
What Will You Learn? (con’t)

Artistic drawing vs. Technical drawing

What’s the difference?

what will you learn con t10
What Will You Learn? (con’t)

Multiview vs. Isometric

Cavalier vs. Cabinet oblique

Perspective vs. Oblique

what will you learn con t11
What Will You Learn? (con’t)

Drawing Conventions: commonly accepted practices, rules, or methods (e.g., dashed line for hidden feature)

Standards: set of rules that govern how technical drawings are represented (e.g., ANSI standards)

drawing tools con t
Drawing Tools (con’t)

The use of drafting tools

media 1 8 2
Media (1.8.2)
  • Media: surfaces upon which an engineer or technologist communicates graphical information. Different types include:
    • Tracing paper (a thin, translucent paper used for detail drawings)
    • Vellum (tracing paper chemically treated to improve translucency)
    • Polyester film (transparent, waterproof, and difficult to tear, “Mylar”)
  • The American National Standard Institute (ANSI) has established standard sheet sizes and title blocks for media used in technical drawings
alphabet of lines 1 6
Alphabet of Lines (1.6)
  • Pencil Grades
  • Line Weight

Remember that Accuracy, Neatness, and Speed count in technical drawing

alphabet of lines con t19
Alphabet of lines (con’t)
  • AutoCAD®Linetypes

ACAD ISO series lines are very large.

For this class, use standard line types starting from BORDER to PHANTOM lines.

scales 1 8 3 1 8 5
Scales (1.8.3 – 1.8.5)
  • Civil Engineering Scale
scales con t
Scales (con’t)
  • Reading a civil engineer’s scale

Refer to the Chapter 1 Supplement for other types of scales.

next monday lecture
Next Monday Lecture
  • Purchase drafting tools needed for manual drafting portion of class if you have not done so
  • Read Chapter 2 in the graphics communication book