Visualizing an object from different angles, drawing to the scale and labeling the diagrams correctly are some of the important factors in the field of engineering. These things communicate effectively especially in absence of an object.

1. Drawing
The aim of this presentation is to learn to
draw 3D (three dimensional) shapes with
correct proportion. It starts by learning
to visualize an object from different
angles. Drawing to the scale is very
important especially in the field of
engineering. It is also important to label
the diagrams correctly. These different
views of the object along with its labels
are very useful in communication in
absence of the object.

2. Why drawing is important?
It is an effective way of communication!

4. ?
?
?
This man is wondering how big is this structure?
Can you think what might help?

5. To get an exact idea of any object, dimension,
proportion and labels are important. Drawings done
‘to the scale’ are smaller than the real thing, but
have the correct proportions. Therefore to get the
dimension, you can measure straight off the
drawing.
Drawing different views of the object is also
important. This is to allow viewer to understand
what the shape looks like, and also to know
measurements of surfaces easily.
Drawings of different views are helpful to calculate
the amount of material required to manufacture the
object.
Let’s study one example...

6. = iron sheet
Labels
Key = wire mesh
2.4 m
Scale 1.2 m
1m
1.5 m
2m
1.5 m
Scale 1:10 1 cm on drawing = 10 cm in real life

7. Why it is important to draw
different views of an object?
To calculate area, work out how
much material is required

8. 1.6 m
1.5 m
2.1 m
2.5 m
1.5 m
1.5 m
1.6 m
2.1 m
1.6 m 0.5 m 1.5 m
2.5 m
3m
1.5 m
2.5 m
2m 1.5 m
1.5 m

9. How scale works?
1.5 metres = 150 centimetres (in real life)
15 centimetres (on drawing)
20 centimetres (on drawing)
2 metres = 200 centimetres (in real life)
Scale 1:10
1 cm on drawing = 10 cm in real life

10. Understand the scale
1:100 1:100
5 m= 5 cm 5 cm = 5 m
1:10 1:2
7 m = 70 cm 2 cm = 4 cm
1:2 1:20
1 m = 50 cm 4 cm = 0.8 m
1:50 1:50
10 m = 20 cm 4 cm = 2 m

11. 1.2 metre 1.2 metre
2 metres
1:10
12 centimetres 12 centimetres
20 centimetres

12. Activity
Draw a three dimensional diagram of any
simple structure (e.g. A table, a step stool,
a barrel etc.) to the scale. Based on the
diagram, make a 3D model of it. You can use
thick or hard paper as your base material.
This activity will help you understand the
importance of drawing 3D diagram to the
scale.