Sami Ullah, the renowned engineer, presents this useful video for civil engineering students. In this construction video, you will learn how to produce a scale drawing in civil engineering.
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:.
a) Scale: – 1cm = 1m or 1cm=100cm or 1:100 b) Representative Fraction: – (RF) = 1/100 (below one) i.e. the ratio among the size of the drawing and the object.
There are three types of scales like reducing scale, enlarging scale and full size scale.
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: – 1cm=100cm or 1:100 and by RF=1/100 (less than one)
Full scale: Occasionally, 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: – 1cm = 1cm or 1:1 and by R.F=1/1 (equal to one).
Enlarging scale: If the objects are very tiny, 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: – 10cm=1cm or 10:1 and by R.F= 10/1 (more than one)
To get online demonstration, watch the following video tutorial.