Ch.1 Introduction to Graphics Communication
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Transcript of Ch.1 Introduction to Graphics Communication
Ch.1 Introduction to Graphics Communication
Importance of technical graphics Traditional engineering design & Changes
in the engineering design process What you will learn the manual drafting
portion of CE En 112 Technical drawing tools that you need ANSI standard sheet sizes Basics: Line weight & pencil grades Alphabet of lines Scales
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
From traditional “linear” design process to new“concurrent” 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.
What you will learn in the manual drafting portion of CE112
Visualization
Learn to mentally control visual information
Graphics theory
Learn to construct engineering geometry and master basic project techniques
Standards Learn a set of rules that govern how parts are made and technical drawings are represented
Conventions
Master commonly accepted practices and methods used for technical drawings
Tools Learn how to use drafting tools, both hand-held and computer tools
Applications
Learn how technical graphics are used in engineering design
What’s the difference between artistic drawing and technical drawing?
Artistic drawing vs. Technical drawing
Projection techniques we learnParallel projection Orthographic Axonometric
(Isometric)
Multiview (& auxiliary)
Oblique Cabinet
CavalierPerspective projection
Linear One-point
Two-point
Projection types
Multiview vs. Isometric
Cavalier vs. Cabinet oblique
Perspective vs. Oblique
Samples of drawing conventions and standards
Manual drafting tools for technical drawing
Two mechanical pencils: 0.7 and 0.5 mm, or 0.5 and 0.3 mm combinations; Pencil grades – HB and H, or F and 2H combinations)
One compass and one dividerOne set of 45- and 30/60-degree trianglesTwo scales (one English unit and one Metric unit)One irregular curve (French curve)One protractor
One good eraser (and if you can afford, one erasing shield)
Use of drafting tools – a few examples
ANSI Standard Sheet Sizes & typical title block layouts
Pencil grades and Line weight
Remember that Accuracy, Neatness, and Speed count in technical drawing
Alphabet of lines (1)
Alphabet of lines (2)
Civil engineering scale: English unit and Metric unit
See Fig 1.50 through 1.60.
Reading a civil engineer’s scale
See fig 1.50 through 1.60 for other types of scales.