JSS3: BASIC TECHNOLOGY - 1ST TERM
Materials & Processing - Timber I | Week 15 Topics|1 Quiz
Materials & Processing - Timber II | Week 23 Topics|1 Quiz
Processing of Materials - Metals | Week 35 Topics|1 Quiz
Processing of Clay, Ceramics and Glass | Week 45 Topics|1 Quiz
Methods of Producing Plastics & Rubber | Week 52 Topics|1 Quiz
Drawing Practice - Isometric Drawing | Week 64 Topics|1 Quiz
Oblique Projection | Week 72 Topics|1 Quiz
Orthographic Projection | Week 84 Topics|1 Quiz
Perspective Drawing (One - Point Perspective Drawing) | Week 94 Topics|1 Quiz
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Steps Involved in Isometric Drawing
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, breadth and 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.
To make an isometric drawing of a rectangular block of size 6cm by 4 cm by 1.5cm.
(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.
b. Mark off on these axes length AB 6cm, width AC 4cm, and height AD 1.5cm.
c. Erect vertical lines at points B and C. (BE and CF)
d. Draw lines parallel to AB and AC from D to get lines DE and DF
e. Draw lines parallel to DE and DF to get lines FG and EG, meeting at point G to complete the rectangular object.
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.
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.