How to Select Scale Drawing | Types of Scale in Civil Engineering |


In this article today I will discuss about that how to a scale drawing in detail so after reading this article you will be able to know about Civil Engineering scale.

 Civil Engineering Scale:

In civil engineering, scale signifies the proportion or ratio among the dimensions chosen for the drawing and the related dimensions of the object.

Representing scales: The ratio among the drawing and the object is demonstrated with two systems as follows:.

Scale Selection :

1 cm = 1 meter   = 1 : 100

1 cm = 10 cm   = 1 :  10

a) So you can also take  100 cm or 1:100     b) Representative Fraction: – (RF) = 1/100 (below one) i.e. the ratio among the size of the drawing and the object.

We have main Four Types of Scale which are given below:
  1. Plain Scale
  2. Reducing Scale
  3. Full Scale
  4. Enlarger Scale

Plain Scale : 

Plain Scale is one of the important scale in civil engineering and its used to measure the two dimensions only,

For Example :  we can take the measurement length in meter and decimeter etc.

Like : 1/100 = 1 cm equal to 1 meter , 1/50 = 2 cm equal to .5 meters

Reducing Scale:

It is a type of scale ideal for the surveyors to minimize chains and links to acres and roods by inspection as well as in mapping and drawing to different scales.

Sometimes, it becomes essential to minimize a drawing to a smaller scale, or to determine a small fraction of a specified dimension, such fraction is not marked on the lineal measuring rules at hand.

It is defined with the scale and RF as follow :-

Scale: – 1 cm = 100 cm or 1:100 and by RF=1/100 (less than one)

Full scale:

full scale some time we can not use in the drawing in civil engineering so we take  the actual dimensions of the object is choose on the drawing then in that case it is described with the scale and RF as follow :

Scale: – 1 cm = 1 cm or 1:1 and by R.F=1/1 (equal to one).

Enlarging scale:

If the objects are very thin and we want to take the dimensions chosen on the drawing are larger than the real dimensions of the objects then in that case it is illustrated by scale and RF as follow

Scale: – 10 cm =1 cm or 10:1 and by R.F= 10/1

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