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Ahmed Kovacevic, City University London
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Introduction to Engineering Drawing
Prof Ahmed Kovacevic
School of Engineering and Mathematical SciencesRoom C130, Phone: 8780, E-Mail: a.kovacevic@city.ac.uk
www.staff.city.ac.uk/~ra600/intro.htm
Engineering Drawing and Design - Lecture 2
ME 1110 – Engineering Practice 1
Ahmed Kovacevic, City University London
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Objectives for today
� Communication modes in engineering design
� Types of drawings
� Technical (engineering) drawing standards
� Orthographic projections
� 3rd and 1st Angle Projection
Ahmed Kovacevic, City University London
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Introduction to Drawing
� Communicating» engineer to engineer
» engineer to non-engineer
» non-engineer to engineer
» more than words
Ahmed Kovacevic, City University London
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Types of engineering communication
» Drawings and sketches– Traditional techniques– CAD
» Graphical communication– Technical illustrations, diagrams …
» Written communication
» Oral communication
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� Model» Physical or computer generated
� Technical illustration» Representation of part for non-technical person
� Technical sketch» Expression of ideas and preliminary designs
Engineering Graphics
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3D Model
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Technical Illustration
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Technical Sketching
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Technical Drawing
There are various types of technical drawing
� Design Sketches» Initial Ideas and Requirements» Calculations and Concepts
� Layout Drawings» development of initial design» used to create detailed or assembly drawings
Ahmed Kovacevic, City University London
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Technical Drawing - cont
� Assembly Drawings» parts +/or sub-assemblies = component / machine
� Detail Drawings» information to make or purchase» Include shape, dimensions, tolerances, surface
finish...
Ahmed Kovacevic, City University London
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Assembly
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Detailed
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Sketching
� Communication among engineers� Three types of sketches
» Pictorial– Technical Illustration
» Multiview– Engineering Drawing
» Diagrammatic– System Illustration
Ahmed Kovacevic, City University London
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Pictorial
Multiview
Diagrammatic
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Communicate carrefully
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ISO International Standards Organization
Standard Code
ANSI American National Standard InstituteUSA
JIS Japanese Industrial StandardJapan
BS British StandardUK
AS Australian StandardAustralia
Deutsches Institut für NormungDINGermany
Country Code Full name
มอก. สาํนักงานมาตรฐานผลิตภณัฑอ์ุตสาหกรรมThailand
Ahmed Kovacevic, City University London
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Drawing Layout
BS8888 British standard for Engineering drawings
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Elements of the Title Block
Text should not be smaller than 3mm.
Title block text 4-6 mm
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Lines
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Human vision
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Features of Solid Objects
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How to create an Object
Join, Subtract, Intersect, Cut
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How to represent an object
Perspective
ParallelAhmed Kovacevic, City University London
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Multiview - Orthogonal
Development
Projection
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Image orientation – normal faces
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Camera metaphor
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The six principal views
Orthographic projections
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Orthographic projections
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3rd and 1st angle projection
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Normal views and face projection
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Normal and inclined face projections
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View alignment and features
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Exercise DrE-1b
Top
Side
Front
Draw the views shown in 3rd Angle Projection
Side
Top
Front
Draw the views shown in 1st Angle Projection
State whether the views shown are in 1st or 3rd angle.Draw the top view in an appropriate position.
State whether the views shown are in 1st or 3rd angle.Draw the top view in an appropriate position.
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