design web me 1110 – engineering practice 1 objectives for

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: [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. สาํนักงานมาตรฐานผลิตภณัฑอ์ุตสาหกรรมThailand


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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.

design web me 1110 – engineering practice 1 objectives for

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