JSS3: BASIC TECHNOLOGY  1ST TERM

Materials & Processing  Timber I  Week 15 Topics1 Quiz

Materials & Processing  Timber II  Week 23 Topics1 Quiz

Processing of Materials  Metals  Week 35 Topics1 Quiz

Processing of Clay, Ceramics and Glass  Week 45 Topics1 Quiz

Methods of Producing Plastics & Rubber  Week 52 Topics1 Quiz

Drawing Practice  Isometric Drawing  Week 64 Topics1 Quiz

Oblique Projection  Week 72 Topics1 Quiz

Orthographic Projection  Week 84 Topics1 Quiz

Perspective Drawing (One  Point Perspective Drawing)  Week 94 Topics1 Quiz
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Steps Involved in Isometric Drawing
Step 1: Draw with setsquares; place the setsquare 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.
Activity
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.
Responses