Scales Recommended by BIS

SCALES RECOMMENDED BY BIS

The Bureau of Indian Standards (BIS) recommends the following scales, any one of which may be choosen for a particular drawing depending upon the size and complexity of the object and the size of drawing sheet.

Example 1: A 7 cm long line in the drawing represents 14 m long of wall. Determine the Representative Fraction and scale. 

Hence scale of drawing is 1 : 200.

Example 2 : A 3 cm diameter of circle in the drawing represents 5 mm diameter of object. Determine the Representative Fraction and scale.

Hence scale of the drawing is 6 : 1.

Example 3 : The shape of a plot is a trapezium having parallel sides 6 m and 4 m and the perpendicular distance between the parallel sides is 5 m. Draw the plot taking representative fraction as 1 : 100.

It is given that the Representative fraction (R.F) is 1 : 100.

Hence draw a line of length 1 cm to represent 1 m actual length. 

The representation of the plot on a drawing sheet is shown in Fig. 5.2.