CE En 112 Engineering Drawing with CAD Application

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CE En 112 Engineering Drawing with CAD Application

• Chapter 1 Introduction to Graphics Communication

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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)
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After completing this chapter, you will be able
to

• Describe why the use of graphics is an effective
  means of communicating when designing
• Define standards and conventions as applied to
  technical drawings
• Describe the design process
• Identify the important traditional tools used to
  create technical drawings
• Use sketching to draw lines, circles, arcs, and
  curves
• Read and use scales
• Identify the types and thickness of the various
  lines in the alphabet of lines
• Create a design sketch using pencil
• Identify and use sketching tools
• Follow good hand-lettering practice

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Introduction (1.1-1.5, 1-7)

• Engineers Creative people who use technical
  means to solve problems. They design products,
  systems, devices, and structures to improve our
  living conditions. (p.4)
• Technical Drawings a clear, precise language
  (non-verbal) 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

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Introduction (cont)

• 92 of the design process is graphical
• The remaining 8 is mathematics and written
  communication

Breakdown of Engineers time
Who uses engineering graphics?
All aspects include graphics communication
Fig. 1.1
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Introduction (cont)

• 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?

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Introduction (cont)
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
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What Will You Learn? (1.9)
CE En 112 Manual Drafting
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What Will You Learn? (cont)
Artistic drawing vs. Technical drawing Whats the
difference?
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What Will You Learn? (cont)
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What Will You Learn? (cont)
Multiview vs. Isometric
Cavalier vs. Cabinet oblique
Perspective vs. Oblique
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What Will You Learn? (cont)
Drawing Conventions (1.5) commonly accepted
practices, rules, or methods (e.g., dashed line
for hidden feature)
Standards (1.5) set of rules that govern how
technical drawings are represented (e.g., ANSI
standards)
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Drawing Tools (1.8)
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Drawing Tools (cont)
The use of drafting tools
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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

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Media (cont)
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Alphabet of Lines (1.6)

• Pencil Grades
• Line Weight

Remember that Accuracy, Neatness, and Speed count
in technical drawing
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Alphabet of lines (cont)
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Alphabet of lines (cont)
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Alphabet of lines (cont)

• AutoCADLinetypes

ACAD ISO series lines are very large. For this
class, use standard line types starting from
BORDER to PHANTOM lines.
We will see these line types in AutoCAD.
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Scales (1.8.3 1.8.5)

• Civil Engineering Scale

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Scales (cont)

• Reading a civil engineers scale

Refer to the Chapter 1 Supplement for other types
of scales.
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Next Manual Drafting Lecture (Jan 29)

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