1. ENGN103 Engineering Drawing
Lecture 1

2. Structure of Presentation
Introduction
Tools for Drawing
Paper sizes
Title Block
Dimensioning
Lettering
Lines

3. Drawing
Artistic Drawing Technical Drawing

4. Why Engineering Drawing?
A drawing is a graphic representation of an object, or a part of it, and is the result of creative thought by an engineer or technician.
Engineering Drawing is a formal and precise way of communicating information about the shape, size, features and precision of physical objects.
Drawing is the universal language of engineering.
Introduction: Overview
Engineering drawing ENGN103

5. Drawing Tools To prepare a drawing, one can use:
Manual drafting instruments
Computer-aided drafting or design, or CAD.
The basic drawing standards and conventions are the same regardless of what design tool you use to make the drawings.
In learning drafting, we will approach it from the perspective of manual drafting.
If the drawing is made without either instruments or CAD, it is called a freehand sketch.
Introduction: Apparatus
Engineering drawing ENGN103

6. Manual drafting Table/Board
The basic mechanics of drafting is to place a piece of paper (or other material) on a smooth surface with right-angle corners and straight sides - typically a drafting table. A sliding straightedge known as a t-square is then placed on one of the sides, allowing it to be slid across the side of the table, and over the surface of the paper …
Parallel lines can be drawn simply by moving the t-square and running a pencil or technical pen along the t-square's edge, but more typically the t-square is used as a tool to hold other devices such as set squares or triangles. In this case the draftsman places one or more triangles of known angles on the t-square - which is itself at right angles to the edge of the table - and can then draw lines at any chosen angle to others on the page. Modern drafting tables come equipped with a parallel rule that is supported on both sides of the table to slide over a large piece of paper. Because it is secured on both sides, lines drawn along the edge are guaranteed to be parallel.
Introduction: Apparatus
Engineering drawing ENGN103

7. Introduction: Apparatus
Engineering drawing ENGN103

8. Introduction: Apparatus
Engineering drawing ENGN103

9. Introduction: Pencils
Engineering drawing ENGN103

10. Introduction: Paper Size
Engineering drawing ENGN103

11. Introduction: Paper Size
Engineering drawing ENGN103

12. Introduction: Title Block
Engineering drawing ENGN103

13. T I T L E
COURSE
DATE
ID. NO:
NAME
SCALE NO
90 mm
30 mm
10 mm
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
a b c d e f g h i j k l m n o p q r s t u v w x y z
A B C D E F G H I J K L M N O P
Q R S T U V W X Y Z
20 mm
15 mm
Introduction: Assignment 1
Engineering drawing ENGN103

14. Introduction: Overview
Engineering drawing ENGN103

15. In order to get the feel of what dimensioning is all about, we can start with a simple rectangular block. With this simple object, only three dimensions are needed to describe it completely (figure 26). There is little choice on where to put its dimensions.
Figure 26 - Simple Object
Engineering drawing ENGN103

16. Thicker than dimension line 2 mm height 6 mm length
Thin and Continuous
ARROWHEAD
Thicker than dimension line
2 mm height
6 mm length
Engineering drawing ENGN103

18. Introduction: Lettering
Engineering drawing ENGN103

19. 10 mm
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
10 mm
10 mm
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
a b c d e f g h i j k l m n o p q r s t u v w x y z
10 mm
a b c d e f g h i j k l m n o p q r s t u v w x y z
a b c d e f g h i j k l m n o p q r s t u v w x y z
A B C D E F G H I J K L M N O P
Q R S T U V W X Y Z
15 mm
10 mm
A B C D E F G H I J K L M N O P
Q R S T U V W X Y Z
10 mm
30 mm
90 mm
90 mm
30 mm
COURSE
NAME
10 mm
T I T L E NO
SCALE
20 mm
30 mm
DATE
ID. NO:
10 mm
Introduction: Assignment 1
Engineering drawing ENGN103

20. Thick- HB grade pencil Medium- H Grade pencil Thin- 4H grade pencil
Introduction: Lines-Home Work
Engineering drawing ENGN103

21. Thick- HB grade pencil Medium- H Grade pencil Thin- 4H grade pencil
Introduction: Lines-Home Work
Engineering drawing ENGN103