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1.6 Isometric drawing

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Technology

Grade 8

Structures

Module 7

Isometric drawing

Activity 1

Isometric drawing

Focus task 1

  • With this method of drawing, the object of the drawing is shown at right angles, viewed as from the front, and lines that represent the sides of the object drawn at a 45 degree angle to the left or the right.

How to do an isometric drawing:

  1. Draw the front view of the object:
  1. Draw feint construction lines at a 45 degree angle to the left or to the right to suggest depth:
  1. Indicate the depth on the lines representing depth:
  1. Complete the drawing:
LO 2.1

Activity 2

Safety precautions in the classroom:

  • Rules for safety are the most important aspect of any workshop. You must be thoroughly acquainted with the rules and safety measures that apply in your workshop. Ensure that you know what safety procedures have to be followed in case of an accident. Each learner must also know where the emergency switch and the first aid kit are located. Report every accident to your educator.

Note the following:

  1. Clothing :
  • Wear an apron or overall;
  • Wear shoes;
  • Tuck in ties and jewellery so that these items will not get in the way;
  • Roll up long sleeves and tie hair to keep it out of the way.
  • Behaviour :
  • A workshop is no place for games;
  • Do not run in a workshop;
  • Never use a workshop on your own or without permission.
  • Working safely :
  • Use tools for the purpose for which they were designed;
  • Put every tool away in the allocated place when you have finished using it;
  • When carrying sharp-edged or pointed tools, hold them in such a way that the dangerous points or edges point towards the floor;
  • Follow the instructions provided on machines;
  • Wear safety goggles when working on machines;
  • Report any faulty machines;
  • See to it that machines are left in proper order when you finish working on them.

Safety measures for working with electricity follow in the module on electronics!

Assignment 1

  • Make a list of dangerous situations that can possibly occur in a workshop:

Assessment

Learning Outcomes(LOs)
LO 1
TECHNOLOGICAL PROCESSES AND SKILLS The learner will be able to apply technological processes and skills ethically and responsibly using appropriate information and communication technology.
This is demonstrated when the learner:
investigates:1.1 investigates the background context, the nature of the need, the environmental situation, and the people concerned when given a problem, need or opportunity set in a nationally relevant context;
1.3 develops and performs practical tests in the technological areas (Structures, Processing, and Systems and Control);
1.4 uses appropriate technologies and methods to:
  • collect relevant data from different sources and resources;
  • extract relevant data;
  • make meaningful summaries;use information to justify and support decisions and ideas;
designs:1.5 writes or communicates a short and clear statement or a design brief in response to a given identified situation for the development of a product or system;
1.6 lists product and design specifications and constraints for a solution to an identified or given problem, need or opportunity based on most of the design key words listed below:
    • people: age target market;
  • purpose: function;
  • appearance: colour, shape;
  • environment: where will product be used;
  • safety: for users;
  • cost: cost of materials;
1.7 generates several alternative solutions and writes notes, ideas that show some links to the design brief and specifications;
makes:1.9 develops a plan for making that outlines all of the following:
  • resources needed;
  • sketches showing the necessary dimensions or quantities;
  • all steps necessary to making the product;
LO 2
TECHNOLOGICAL KNOWLEDGE AND UNDERSTANDING The 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 7

  • Ensure that the learners are given sufficient opportunity to master this important drawing skill. Neatness is particularly important and the use of light construction lines and basic sketching skills (Activity 4) will enable the learner to meet these requirements.
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Source:  OpenStax, Technology grade 8. OpenStax CNX. Sep 13, 2009 Download for free at http://cnx.org/content/col11052/1.1
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