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

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

3. 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

4. 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

5. Q 2a.
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.
What area of the ship are they discussing?
What does the technician need to know?
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

6. Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305
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

7. Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305
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

8. Q2a Answers Part of a staircase (Staircase 3, Deck C)
What area of the ship are they discussing?
What does the technician need to know?
Answers
Part of a staircase (Staircase 3, Deck C)
The number of panels, and their size
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

9. Q2b: Complete the following definitions using the types of drawing in the box.
cross-section, elevation, exploded view, note, plan, schematic, specification
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.
_____ gives a simplified representation of a network of air ducts.
_____ gives a brief description or a reference to another related drawing.
_____ gives detailed written technical descriptions of the panels.
Answers
2 elevation
3 exploded view
4 cross-section
5 schematic
6 note
7 specification
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

10. I. Working with Drawings
2c. Which two types of drawing in Exercise 2b 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

11. 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

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

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

14. I. Working with Drawings
3a. 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 3b, and 3c
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305

15. HW: Unit 4a Do Q3b & c Do Q4 & Q5 Due date: March 16
Dr. Hatem Elaydi, IUG, Spring 2016, ENGG 1305