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JSS3: BASIC TECHNOLOGY - 1ST TERM

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

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The two methods of Oblique projection are cavalier projection and cabinet projection

Cavalier Oblique Projection: In this projection, the receding axes (width) are drawn full size.

Cabinet Oblique Projection: the receding axes (width) are drawn half-size to reduce distortion, but they are dimensioned full size. This is used to draw furniture i.e. cabinets.

Types of oblique projections

Activity:

To draw a rectangular block of length 6cm, breadth 5.0cm and depth 2.0cm in oblique projection.

Screen Shot 2021 09 26 at 6.36.33 PM

a. Construct the oblique axes with two right angles and the third at 45° to the horizontal.

Screen Shot 2021 09 26 at 6.29.04 PM

b. Mark off on this axes, the length, breadth, and depth of the rectangular block.

Screen Shot 2021 09 26 at 6.30.26 PM

c. Draw the necessary parallel lines to complete the block.

Screen Shot 2021 09 26 at 6.33.20 PM
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