INTRODUCTION TO DRAUGHTING

This course will introduce you to the fundamentals of draughting, draughting tools, and various draughting disciplines.

When you complete this learning unit, you as a learner should be able to:

- Identify and describe the important functions of engineering drawings.
- Describe the purpose of engineering drawings in the industry.
- Identify and correctly use the alphabet of lines used on an engineering drawing.
- Identify and correctly use freehand printing of letters and numbers according to the SABS code of practice for engineering drawing.
- Identify and correctly use the drawing instruments and equipment required for creating engineering drawing.
- Know how to take care of drawing instruments and equipment.

**Course Duration:** 9 Months

**Time: **Self-Study (on your own time)

**Entrance requirements:**

- Knowledge assumed to be in place before starting this unit.
- Basic communication skills

COURSE LAYOUT

**Basic Principles of Engineering Drawing**

- Introduction
- The History of Engineering Drawing
- What is Engineering Drawing?
- Engineering Drawing as a means of communication
- Important functions of Engineering Drawing
- The uses of Engineering Drawing
- The purpose of Engineering Drawing as a subject
- The drawing office
- Drawing equipment and instruments
- Drawing paper sizes
- The application of drawing instruments
- The alphabet of Engineering Drawing
- Printing letters and figures
- Examples of vertical capital letters and figures
- Dimensions

**Free Hand Drawing**

- Introduction
- Instruments used for freehand drawing
- Aspects of freehand drawing
- Freehand drawing of complex shapes
- Drawing horizontal lines
- Drawing vertical lines
- Drawing diagonal lines
- Freehand drawing of circles and arcs
- Freehand drawing using square grid paper

**Geometrical Constructions**

- Introduction
- Instrument requirements
- Construction to bisect a straight-line segment
- Construction to bisect a 45° angle
- Construction of a 60° angle
- Construction to bisect a 60° angle
- Construction to bisect a 30° angle
- Construction of a 75° angle
- Construction of a perpendicular line from a given point on a line
- Construction of a perpendicular line from a given point outside a given line

- Construction of a perpendicular line at the end of a given line segment
- Construction of a parallel to another line at a given distance
- Dividing a given line segment into any number of equal parts
- Construction of an arc of a circle to lines forming a right angle
- Construction of an arc of a circle to lines forming an acute angle
- Construction of an arc of a circle to lines forming an obtuse angle
- Construction of an arc of a circle to a line and an arc or circle
- Construction of an arc of a circle to two arcs or circles
- Drawing a circle to pass through any points A, B and C
- Construction of an equilateral triangle
- Construction of a square: the inscribed-circle method
- Construction of a square: the circumscribed-circle method
- Construction of a hexagon: the across flats method
- Construction of a hexagon: the across-corners method
- Construction of a octagon: the across flats method
- Construction of an octagon: the across-corners method
- Construction of an ellipse

**First-Angle Orthographic Projection**

- Introduction
- Visualisation
- What makes an orthographic view?
- Principles of first-angle orthographic projection
- Projection system symbol for first angle orthographic projection
- Projection methods for first angle for first-angle orthographic projection
- Reading an engineering drawing
- Setting up an orthographic projection drawing