An engineering drawing must be
a)
b)
c)
d)
e)
Easy to understand
Specific
Perfect (no mistakes)
Geometrically accurate
Easy to interpret
Common standards
a) IS = Indian standards
b) ISO = International Standards Organization
Each size is made by cutting previous size to half
Scaling
a)
b)
c)
d)
e)
f)
IS = 10713:1983
ISO = 5455:1979
Full size = 1:1
Reduction scale = Ratio is smaller than 1:1
Enlargement scale = Ratio is bigger than 1:1
In case of exceptional cases if the recommended scales (scales scaled to integral power of
10) cannot be used then intermediate scales can be used
Lettering
Similar standard for lettering. Size of each alphabet must be in the specified range and the gap
between two consecutive letters must also be equal-both vertically and horizontally.
Basic steps to create an engineering drawing
1)
2)
3)
4)
Visualize object/idea
Express as a sketch
Add size related info
Represent as a formal and professional drawing which follows all conventions and standards