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JSS3: BASIC TECHNOLOGY - 1ST TERM

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  1. Materials & Processing - Timber I | Week 1
    6 Topics
    |
    1 Quiz
  2. Materials & Processing - Timber II | Week 2
    4 Topics
    |
    1 Quiz
  3. Processing of Materials - Metals | Week 3
    5 Topics
    |
    1 Quiz
  4. Processing of Clay, Ceramics and Glass | Week 4
    5 Topics
    |
    1 Quiz
  5. Methods of Producing Plastics & Rubber | Week 5
    2 Topics
    |
    1 Quiz
  6. Drawing Practice - Isometric Drawing | Week 6
    4 Topics
    |
    1 Quiz
  7. Oblique Projection | Week 7
    2 Topics
    |
    1 Quiz
  8. Orthographic Projection | Week 8
    4 Topics
    |
    1 Quiz
  9. Perspective Drawing (One - Point Perspective Drawing) | Week 9
    4 Topics
    |
    1 Quiz



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Topic Content:

  • Principal Planes of Orthographic Projection

Orthographic projection uses two main planes called the principal planes of projection, they are the vertical plane planes and the horizontal planes. 

These two planes intersect, producing four quadrants. The object to be drawn is imagined to be placed in one of these quadrants, and orthographic views of it are projected onto the planes.

The object is normally positioned so that its main faces are parallel to them. This ensures that views of the faces are true sizes and shapes.

Principal Planes of Orthographic Projection:

 

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