, DEVELOPMENT OF
SURFACES OF SOLIDS
Prepared by
Dr. Muhammad Imran
Engineering Drawing &
02/05/2023 Graphics 2
, INTRODUCTION
If a piece of paper is wrapped around a cylinder or on
all sides of a square prism and laid out or opened on a
flat surface. OR
When the complete surface of a solid is opened out
and laid on a plane, the surface of the solid is said to
have been "developed" and the figure obtained is
called "development" of the surface.
Every line on the development must be the true length
of the corresponding line on the surface.
Engineering Drawing &
02/05/2023 Graphics 3
, INTRODUCTION
A developable surface is one which may be unfolded
or unrolled so is to coincide with a plane. Single
curved surfaces such as of cones and cylinders can be
accurately developed.
Warped and double curved surfaces such as of sphere,
tours, ellipsoid and hyperboloid are undevelopable.
These can, however, be approximately developed by
dividing them into a number of parts.
Engineering Drawing &
02/05/2023 Graphics 4
SURFACES OF SOLIDS
Prepared by
Dr. Muhammad Imran
Engineering Drawing &
02/05/2023 Graphics 2
, INTRODUCTION
If a piece of paper is wrapped around a cylinder or on
all sides of a square prism and laid out or opened on a
flat surface. OR
When the complete surface of a solid is opened out
and laid on a plane, the surface of the solid is said to
have been "developed" and the figure obtained is
called "development" of the surface.
Every line on the development must be the true length
of the corresponding line on the surface.
Engineering Drawing &
02/05/2023 Graphics 3
, INTRODUCTION
A developable surface is one which may be unfolded
or unrolled so is to coincide with a plane. Single
curved surfaces such as of cones and cylinders can be
accurately developed.
Warped and double curved surfaces such as of sphere,
tours, ellipsoid and hyperboloid are undevelopable.
These can, however, be approximately developed by
dividing them into a number of parts.
Engineering Drawing &
02/05/2023 Graphics 4
