Reference Book
the object so that the portion in front of the plane can be imagined to be removed
so as to expose inner details.
The sectional view shows and elaborates the internal construction of a machine,
so that the drawing shows the components and parts that a machine consists
of. The view can be the section of either Top view , Front view or Side view.
Actually the sectional view is an “anatomy” study of a machine. Designers use
these view to analyse the constructional details and to modify the design of a
machine. They are the projected views (either Auxiliary or Orthographic) which
show a cross section of the source object along the specified cut plane. There
are different types of sectional views such as (1) Full Sectional view. (2) Half
Sectional view , (3) Partial/ Broken Sectional view, (4) Revolved Sectional
view, (5) Offset sectional view and (6) Removed sectional view.
DEVELOPMENT OF SURFACES
The knowledge of development of surfaces is used in the engineering
applications such as sheet metal works, automobile body building, packing
industry etc. The surface of an object which are opened out and laid on a flat
plane is called the development of surfaces of that object.
DEVELPOMENT OF CYLINDERCylinder is wrapped around a paper. When the paper is opened, it is rectangle
in size.
Length = circumference of cylinder
Breadth = Height of cylinder
Generally, parallel line method is used for development of cubes, prisms,
cylinder etc.