5. SCALE

SCALES


Representing scales: The proportion between the drawing and the object can be represented by two ways as follows:

a) Scale: - 1cm = 1m or 1cm=100cm or 1:100

b) Representative Fraction: - (RF) = 1/100 (less than one) i.e. the ratio between the size of the drawing and the object.

There are three types of scales depending upon the proportion it indicates as

1. Reducing scale: When the dimensions on the drawing are smaller than the actual dimensions of the object. It is represented by the scale and RF as
Scale: - 1cm=100cm or 1:100 and by RF=1/100 (less than one)

2. Life size: Some times the actual dimensions of the object will be adopted on the drawing then in that case it is represented by the scale and RF as
Scale: - 1cm = 1cm or 1:1 and by R.F=1/1 (equal to one).

3. Enlarging scale: In some cases when the objects are very small like inside parts of a wrist watch, the dimensions adopted on the drawing will be bigger than the actual dimensions of the objects then in that case it is represented by scale and RF as
Scale: - 10cm=1cm or 10:1 and by R.F= 10/1 (greater than one)

5.1. Choosing the scale.
Exercise. Measure your living room and, if you have two, choose one of them, choose the scale that you need to draw in a din A4, and do the diagram about it.
Remember:
  • To choose the scale, look for the relationship between the size of the object in the paper and in real life.
  • One step is equivalent to one meter.

5.2 Graphic scale.

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