Ahmed Kovacevic, City University London
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Introduction to Engineering Drawing
Prof Ahmed Kovacevic
School of Engineering and Mathematical Sciences
Room CG25, Phone: 8780, E-Mail: [email protected]
www.staff.city.ac.uk/~ra600/intro.htm
Engineering Drawing and Design - Lecture 2
ME 1110 – Engineering Practice 1
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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
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Introduction to Drawing
Communicating
» engineer to engineer
» engineer to non-engineer
» non-engineer to engineer
» more than words
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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
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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...
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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
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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. ส ำนักงำนมำตรฐำนผลิตภณัฑอ์ตุสำหกรรมThailand
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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
Parallel
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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
Draw the views
shown in 3rd Angle
Projection
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.