What is Scale of a Drawing:
The proportion by which the drawing of a given object is enlarged or reduced is called the scale of the drawing.
What is Representative Fraction or Scale Factor:
The scale of a drawing is indicated by a ratio, called the Representative Fraction (RF) or Scale Factor. RF = Length of a line in the drawing divided by Actual length of the line on the object
What is Reducing Scale:
When huge objects are to be drawn, they are reduced in size on the drawing. The scales used for these objects are called reducing scales. It is clear that the length of the object on the drawing is less than the actual length of the object. Reducing scales are mentioned in the format 1 :Y, where Y is greater than 1. Hence, RF greater than 1.
What is Enlarging Scale:
When smaller objects are to be drawn, they often need to be enlarged. The scales used in such cases are called enlarging scales. Obviously, the length of an object on the drawing is more than the corresponding actual length of the object. Enlarging scales are mentioned in the format X : 1, where X is greater than 1. Clearly, RF less than 1.
What is Full Scale:
When an object is drawn on the sheet to its actual size, it is said to be drawn to full scale. As the length on the drawing is equal to the actual length of the object, the full scale is expressed as 1:1. Obviously, for full scale, RF = 1.
What is Plain Scale:
It is a line divided into suitable number of equal parts or units, the first part of which is subdivided into small parts.
What is Diagonal Scale:
In diagonal scale the smallest unit on plain scale is further subdivided by using diagonal principle.
Scale topics covered on this channel:
Theory of Scales
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Plain scale problem 1 practice on Sheet
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Diagonal Scale problem 1
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Diagonal scale problem 1 practice on sheet
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Diagonal Scale Problem 2
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Diagonal Scale Problem 4
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Plain Scale Problem 2
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Plain Scale Problem 3
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