ENGN103 Engineering Drawing Lecture 1

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

Drawing Artistic Drawing Technical Drawing

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

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

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

Introduction: Apparatus Engineering drawing ENGN103

Introduction: Apparatus Engineering drawing ENGN103

Introduction: Pencils Engineering drawing ENGN103

Introduction: Paper Size Engineering drawing ENGN103

Introduction: Paper Size Engineering drawing ENGN103

Introduction: Title Block Engineering drawing ENGN103

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 1 2 3 4 5 6 7 8 9 0 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 1 2 3 4 5 6 7 8 9 0 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 1 2 3 4 5 6 7 8 9 0 20 mm 15 mm Introduction: Assignment 1 Engineering drawing ENGN103

Introduction: Overview Engineering drawing ENGN103

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

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

Introduction: Lettering Engineering drawing ENGN103

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 1 2 3 4 5 6 7 8 9 0 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 1 2 3 4 5 6 7 8 9 0 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 1 2 3 4 5 6 7 8 9 0 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 1 2 3 4 5 6 7 8 9 0 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 1 2 3 4 5 6 7 8 9 0 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 1 2 3 4 5 6 7 8 9 0 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 1 2 3 4 5 6 7 8 9 0 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 1 2 3 4 5 6 7 8 9 0 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

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

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