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    By: Siyavula

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The basics of sketching

Module by: Siyavula Uploaders. E-mail the author

TECHNOLOGY

Grade 8

STRUCTURES

Module 4

THE BASICS OF SKETCHING

Activity 1

The basics of sketching

Focus task 1

Although we quite readily use the excuse that we “cannot draw”, it is useful to remember that sketches were used in prehistoric times, even before people learnt how to write. It may be true that some people have greater artistic ability than others when it comes to drawing, but even the greatest artists did not just begin to make art. You are also able to develop your drawing skill and it is important to do this by practising methods that will help you to make good sketches. Bear in mind that sketches are free-hand drawings.

Some guidelines:

  • Use a soft pencil, e.g. HB
  • Grasp the pencil between your fingers, about 20 mm from its tip.
  • Do not rest your hand on the paper while you draw (do free-hand drawing)
  • Hold the pencil at an angle so that you are able to see its point.
  • Be relaxed about what you are doing.

Try the following steps:

  1. Draw a number of parallel lines, vertically, horizontally and diagonally. Try to focus on the point towards which you are drawing the lines, and keep your wrist from bending.
Figure 1
Figure 1 (Picture 1.png)
Figure 2
Figure 2 (Picture 2.png)
Figure 3
Figure 3 (Picture 3.png)
  1. Once you feel at ease with drawing parallel lines, you may start drawing horizontal and vertical lines to form right angles (90 degree angles).
Figure 4
Figure 4 (Picture 4.png)
  1. When you are able to draw these right angles confidently, you are ready for the next step: drawing squares. Squares and rectangles are commonly used to frame other objects that are sketched.
Figure 5
Figure 5 (Picture 5.png)
  1. If you have to draw a circle, it may be useful to sketch a square – lightly. The sides should be equal to the diameter of the circle that is required. By marking the centres of the four sides you will identify the points of contact of the circle.
Figure 6
Figure 6 (Picture 6.png)
  1. When you need to draw an elliptical shape, you may start by drawing a rectangle to guide you.

Figure 7
Figure 7 (Picture 7.png)

Table 1
         
  LO 2.1      
         

Assessment

Table 2
LO 2
TECHNOLOGICAL KNOWLEDGE AND UNDERSTANDINGThe learner will be able to understand and apply relevant technological knowledge ethically and responsibly.
This is demonstrated when the learner:
structures:2.1 demonstrate knowledge and understanding of frame structures:
  • the use and application of basic structural components (columns, beams, arches, buttresses, struts, stays, guys, ties);
  • reinforcing techniques for frame structures (triangulation, webs and fillets, orientation and cross-sectional area and members);
  • how frame structures can be made strong (e.g. relationship between the size and the shape of the base, the centre of gravity and stability;
processing:2.2 demonstrates a knowledge and understanding of how materials can be processed to change or improve their properties by adapting them to suit particular purposes:
  • to withstand forces (tension, compression, bending, torsion, shear);
  • to increase strengths or life-span;
  • how specific properties suitable for packaging can be achieved.

Memorandum

ACTIVITY 1

  1. The learners must draw lines by linking dots. An additional suggestion: work from both dots for lines to meet in the middle (By doing this, it is less likely that the line will miss the dot).

2. and 3. Suggest that learners practise drawing straight freehand lines on loose sheets of paper.

4. and 5. Bear in mind that these are freehand sketches. Adequate opportunity for practising freehand drawing on loose paper is therefore important. Also encourage learners to practise in context, e.g. by drawing the wheels of a vehicle, etc.

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