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

CAD – 2D CORRESPONDENCE

 

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