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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
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Step 1: Draw with set-squares; place the set-square and make sure that both the face and side are inclined at 30° to the horizontal plane.

Step 2: Draw the isometric box that contains the object first. The box must have the overall size of the length, the breadth and the width of the desired object. (Note that this must be drawn with very thin lines).

Step 3: Draw the desired shape with faint lines inside the box using the correct dimension.

Step 4: Draw the correct shape of the object with a thick continuous line (i.e. outline.)

Step 5: You may rub off the construction lines or you may not if they are very neat and faint.

Activity

To make an isometric drawing of a rectangular block of size 6cm by 4 cm by 1.5cm.

Screen Shot 2021 09 26 at 8.40.59 AM

(a) Construct the three axes with set squares, that is, one vertical line and two inclined lines at 30° to the horizontal in opposite directions.

Screen Shot 2021 09 26 at 5.12.33 PM

b. Mark off on these axes length AB 6cm, width AC 4cm, and height AD 1.5cm.

Screen Shot 2021 09 26 at 7.52.35 AM

c. Erect vertical lines at points B and C.(BE and CF)

Screen Shot 2021 09 26 at 7.58.37 AM

d. Draw lines parallel to AB and AC from D to get lines DE and DF

Screen Shot 2021 09 26 at 8.02.08 AM

e. Draw lines parallel to DE and DF to get lines FG and EG, meeting at point G to complete the rectangular object.

Screen Shot 2021 09 26 at 8.12.57 AM

g. Draw the correct shape of the object with a thick continuous line (i.e. outline.) You may rub off the construction lines or you may not if they are very neat and faint.

Screen Shot 2021 09 26 at 8.33.47 AM

Work to do:

Draw the block shown below in Isometric projection.

a. Construct the isometric axes.

b. Mark off on these axes the given dimensions of the block.

Screen Shot 2021 09 26 at 8.55.48 PM
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