VISION and PRECISION. Engineering Graphics Drawing and sketching Geometric modelling. Written and oral communication. Professor Malcolm Good

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1 Twin rotor turbopump GL1: Engineering Communications Professor Malcolm Good Department of Mechanical and Manufacturing Engineering Engineering Graphics Drawing and sketching Geometric modelling Written and oral communication VISION and PRECISION

2 GL1:2 Subject organisation The subject is in two parts: Written and oral communications 10 1-h workshops (WO1 - W10) Engineering graphics 17 1-h lectures 7 1-h tutorials 4 2-h drawing office labs (D1 - D4) 3 2-h computer labs (C1 - C3) Assessment Lab assignments (20%) Workshops (15%) Examination (65%) Revision quiz on the Web (0%)

3 ENGINEERING GRAPHICS GL1:3 Why engineering? Engineering is a creative profession: scientists explore what is engineers create what has never been Why graphics? a universal language used in creation and communication

4 A universal graphic language? GL1:4 Egyptian hieroglyphs were based on recognisable graphic symbols

5 Chinese characters became much more abstract GL1:5

6 GL1:6 Many Western languages use standard symbols, but not in a universal way Hello Bon Jour Guten Tag G day...

7 GL1:7 But graphic images from 15,000-18,000 BC communicate very effectively today Red ochre cave painting Vallon-Pont-d'Arc, France

8 With a well-defined vocabulary syntax, and grammar GL1:8 for engineering graphics, we can represent objects in a universally understandable way, and without ambiguity.

9 What and why do we want to communicate? GL1:9 A model of the engineering design process Recognise a need Create a design Prepare a model Test & evaluate Communicate the design Iteration Improve the design A flow chart Engineering graphics are used in: development of ideas analysis of performance communication of concepts and detail

10 GL1:10 Engineers design three-dimensional devices of endless geometric diversity... an automobile part

11 GL1:11 Imagine trying to describe this printer, precisely, using verbal communication a printer

12 GL1:12 graphical methods used for working out impeller geometry a centrifugal fan

13 a rotary destacker GL1:13 many parts must fit together properly when assembled

14 GL1:14 cross-sectional views aid understanding an ore crusher

15 a vehicle GL1:15 complex surface geometry

16 an indulgence... GL1:16

17 GL1:17

18 GL1:18 Engineering graphics is involved at every stage of the design process Recognise Create a Prepare Test & Communicate a need design a model evaluate the design Iteration Improve the design Let s look at some different types of engineering drawing...

19 Engineering drawing GL1:19 Pictorial Diagrams, charts, graphical computations Perspective (converging lines of sight) Orthographic projection (parallel lines of sight) Wiring & circuit diagrams One-point (parallel) Two-point (angular) Three-point (oblique) Orthogonal 3rd-angle 1st-angle Axonometric Flow & organisation charts Graphs Graphical mathematics Isometric Dimetric Trimetric Vector analysis Nomographs Oblique Cavalier Cabinet General Classification of engineering drawings (EDH)

20 Some examples... GL1:20 Sketches (free-hand drawings) Used to develop and communicate ideas pictorial view, oblique projection

21 GL1:21 Sketches Leonardo da Vinci ( ) Parallel projection Perspective projection We will study orthographic projection systems in detail

22 Sketches Used to support analysis load P GL1:22 bending moment M shear force V Free-body diagram of loaded cantilever beam

23 Some examples... GL1:23 Layout drawings (overall design concept) orthogonal projection

24 Space (spatial relationships) for space (exploration)! GL1:24 Multiple Mirror Telescope (6.5 m diameter)

25 Locations of mirror supports and load spreaders for the 6.5 m MMT GL1:25

26 2-axis actuator used for load spreading GL1:26

27 Assembly drawing: identify components and how they fit together GL1:27

28 Detail drawings: specify for manufacture GL1:28 Right side view Top view (plan) Multiview drawing in 3rd-angle orthographic projection Front view Isometric pictorial view

29 Circuit diagrams: specify relationships GL1:29

30 Objectives for this subject: GL1:30 Proficiency in: Geometric modelling

31 Objectives for this subject: GL1:31 Proficiency in: Geometric modelling Graphic communication

32 Objectives for this subject: GL1:32 Proficiency in: Geometric modelling Graphic communication Graphic aids to ideation Thomas Edison: sketch of original phonograph 1877

33 Objectives for this subject: Proficiency in: Geometric modelling Graphic communication Graphic aids to ideation Visualisation in 3-D Watson & Crick double helix structure of DNA 1953 GL1:33

34 GL1:34 What you need Technical Graphics Communication, 2nd edn (Bertoline, Wiebe, et al. 1997) - $75* Essential Printed notes, tutorial and lab assignments - $7.25* Essential (Bookroom or from Web) Engineering Drawing Handbook (IEAust, Standards Australia 1993) - $45 Recommended: Australian standards Drawing instruments (see handout list) - $45 - $100 Highly desirable: some essential An ECR account (see Duty Programmer) - Free! Essential * less 10% discount

35 GL1:35 Eng Com on the Web or, navigate from University home page Department of Mech. & Manuf. Eng. Undergraduate Affairs Engineering Communications Lecture presentations Lab work, tutorial solutions,...

36 GL1:36 Follow up Read Bertoline: Ch 1: Introduction to Graphics Communication Ch 2: The Engineering Design Process Ch 3: Technical Drawing Tools Do problems from Bertoline: Probs 1.6, 1.7, 1.8 Check the EngCom web site Senior tutor: Gavin Dober (tutes/labs)