Unit 4 Engineering Design Working with Drawings Dr

Unit 4: Engineering Design Working with Drawings Dr. Hatem Elaydi Engineering Technical English Islamic University of Gaza March 9, 2016

Unit 4 Outlines: a) Working with Drawings b) Discussing Dimensions and Precision c) Describing Design Phases and Procedures d) Resolving Design Problems Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305 2

What is meant by design? Design = the collective word for all the information that’s given in order to produce or build something) Drawing = a type of picture that has been drawn in order to present design information. In engineering, most designs consist of a set of several drawings. Design is also used in an artistic sense, for example fashion design and interior design. In engineering, the term has a technical meaning, for example design engineer, design calculations, design team, design phase, design fault. Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305 3

I. Working with Drawings Language note You will find the following vocabulary useful in this section. drawing, cross-section / section, elevation, exploded view, note, plan, schematic, specification dimension, scale, to scale (drawn to a scale), scale off (measure from), full-scale, (one) to (five) Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305 4

Q 2 a. 4. 1 Joe, a technician at a shipyard, is talking to Linda, one of his engineering colleagues in the design office. He is asking about some information which he can't find on any of the drawings. Listen to the conversation and answer the following questions. 1. What area of the ship are they discussing? 2. What does the technician need to know? Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305 5

4. 1 Joe: I have a question about the panels on Staircase 3. You know those glass panels around the opening, through Deck C? Linda: Um, yes. I know where you mean, yeah. Joe: Well, I've been looking for a cross-section through the deck, at the stair opening. But I can't find one anywhere. Linda: Isn't there a note on the general arrangement drawing, with a reference to a section on another drawing? Joe: I couldn't find one. Linda: I've got the deck plans out, somewhere on here. What's this? Air conditioning schematic, that's no good. Ah here we are. Deck plan. Um, no, you're right. There's no section mentioned. Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305 6

Joe: I mean. in actual fact. what I need is an elevation, showing all the panels from the front. I thought that might be referenced on the main section through the stairs. Linda: There is a full set of drawings for all the internal panelling, with details showing exploded view so f all the fixing details, and sections through the panel joints. Do you have those? Joe: Not as far as I know. Linda: And there's a written specification for the panels, as part of the main spec. That might specify the sizes. Joe: Those are obviously what I need, then. I want to see how many there are, and what size they are. Have those drawings been issued Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305 7

Q 2 a 1. What area of the ship are they discussing? 2. What does the technician need to know? Answers 1. Part of a staircase (Staircase 3, Deck C) 2. The number of panels, and their size Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305 8

Q 2 b: Complete the following definitions using the types of drawing in the box. cross-section, elevation, exploded view, note, plan, schematic, specification 1. 2. 3. 4. 5. 6. A plan gives a view of the whole deck, from above. _____ gives a view of all the panels, from the front. _____ gives a deconstructed view of how the panels are fixed together. _____ gives a cutaway view of the joint between two panels. Answers _____ gives a simplified representation of a network of air ducts. 2 elevation 3 exploded view _____ gives a brief description or a reference to another related 4 cross-section 5 schematic drawing. 6 note 7. _____ gives detailed written technical descriptions of the panels. 7 specification Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305 9

I. Working with Drawings 2 c. Which two types of drawing in Exercise 2 b are examples of general arrangement drawings, and which two are examples of detail drawings? Answers general arrangement: plan, elevation detail: exploded view, cross-section Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305 10

Language note general arrangement drawing = shows the layout of a whole assembly or structure, but does not give details of smaller individual components detail drawing = shows one or more smaller components in detail Usually, general arrangement drawings have notes on them which give references to related detail drawings. For every general arrangement drawing, there are usually several related detail drawings. Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305 11

Working drawing Sketch Exploded view Design brief Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305 12

Cross section Schematic Specification Uneven Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305 13

I. Working with Drawings 3 a. What is meant by scale on a drawing? ln pairs, explain how a scale rule, like the one shown in the picture, is used. Answers The scale is the ratio between the size of items shown on a drawing, and their actual size (in reality). A scale rule has several scales, allowing dimensions to be measured on a drawing, to determine the actual size Do 3 b, and 3 c Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305 14

HW: Unit 4 a 1. Do Q 3 b & c 2. Do Q 4 & Q 5 Due date: March 16 Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305 15