university of puerto rico at humaco department of physics engineering graphics i traditional tools...
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UNIVERSITY OF PUERTO RICO AT HUMACO
DEPARTMENT OF PHYSICS
ENGINEERING GRAPHICS I
Traditional tools
Dr. Walter López Moreno
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
" 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
Importance of technical graphics
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
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.
Samples of drawing conventions and standards
Lewis Park (Second Floor) downstairs of 2, 3 and 4 bedroom
Architectural Drawing
Manual drafting tools for technical drawing
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)
Compass and one divider
One set of 45- and 30/60-degree triangles
Scales (one English unit and one Metric unit)
Irregular curve (French curve)
Protractor
One good eraser
Use of drafting tools – a few examples
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
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 DrawingsANSI Y14.5M (1982-1994) Dimensioning and Tolerancing.ANSI Y14.6 (1978) Screw Thread RepresentationANSI Y14.6aM (1981) Screw Thread Representation (Metric Supplement)ANSI Y14.7.1 & Y14.7.2 (1978) Gear Drawing Standards
Internet Explorer.lnk
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)