EGD
UNIT 4
Orthographic Projections
Orthographic Projections is a technical drawing in which different views of an object are projected on different reference planes observing perpendicular to respective reference plane.
Different Reference planes are
- Horizontal Plane (HP)
- Vertical Plane (VP)
- Side or Profile Plane (PP)
Different views are
- Front View (FV) – Projected on VP
- Top View (TV) – Projected on HP
- Side View (SV) – Projected on PP
NOTATIONS
Following notations should be followed while naming
Different views in orthographic projections.
Same system of notations should be followed in case numbers, like 1, 2, 3 – are used
Types of views
Orthographic views
Views arrangement
Projection symbols
Methods of Orthogonal Projection
- Natural Method: Revolve the object with respect to observer
- Glass box method: The observer moves around the object
2. Glass box : Revolution of the planes of projection
Relative orientation of views
Summary : Problem solving steps
Steps for Orthographic Views
- Select the necessary views
- Layout the selected views on a drawing sheet.
- Complete each selected views.
- Complete the dimensions and notes.
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