Introduction to Engineering Graphics

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Introduction to Engineering Graphics

• Importance of technical graphics
• Traditional engineering design Changes in the
  engineering design process
• Technical drawing tools
• Standards
• ANSI standard sheet sizes
• Basics Line weight pencil grades
• Alphabet of lines

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Importance of technical graphics
" the engineer, scientist, or technician who is
ignorant of or deficient in the principal mode of
expression (that is, the universal graphic
language) in his or her technical field is
professionally illiterate."     - Page 8.
Principles of Technical Drawing
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Importance of technical graphics

• Technical drawings A language used in the
  design process for communicating, solving
  problems, quickly and accurately visualizing
  objects, and conducting analysis
• A graphical representation of objects and
  structures and is done using freehand,
  mechanical, or computer methods

Users of engineering and technical graphics in
industry
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From traditional linear design process to
newconcurrent 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.
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Samples of drawing conventions and standards
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Architectural Drawing
Lewis Park (Second Floor) downstairs of 2, 3 and
4 bedroom
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Manual drafting tools for technical drawing
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Use of drafting tools a few examples
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Standards

• Organizations involved in developing the
  standards for
• technical drawings
• ANSI (American National Standards Institute)
• ASEE (American Society for Engineering Education)
• SAE (Society of Automotive Engineers)
• ASME (American Society of Mechanical Engineers)
• ISO (International Standards Organization)
• American National Standard Drafting Manual

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Some Important ANSI standards

• ANSI Y14.1 (1980) Drawing Sheet Size and Format.
• ANSI Y14.2M (1979) Line Conventions and
  Lettering.
• ANSI Y14.3 (1975) Multiview and Sectional View
  Drawings
• ANSI Y14.5M (1982-1994) Dimensioning and
  Tolerancing.
• ANSI Y14.6 (1978) Screw Thread Representation
• ANSI Y14.6aM (1981) Screw Thread Representation
  (Metric Supplement)
• ANSI Y14.7.1 Y14.7.2 (1978) Gear Drawing
  Standards

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ANSI Standard Sheet Sizes typical title block
layouts
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Pencil grades and Line weight
Remember that Accuracy, Neatness, and Speed count
in technical drawing
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Alphabet of lines (1)
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Alphabet of lines (2)