What
is Engineering Graphics? A set
of rules and guidelines that help you create an Engineering
Drawing.
What
is an Engineering Drawing? A
drawing that communicates an idea or design.
Examples
of Engineering Drawings
→Mechanical
Engineers (factory/manufactured
parts)
•Detailed
drawing of a part that needs to be machined.
→Electrical
Engineers (appliances
to power transmission)
•A
circuit schematic.
•Circuit
board layout. (electronics)
→Civil
Engineers (topography/landscapes)
•Plans
for a bridge.
•Road
layout.
ØWhat
will we learn in Chapter 1?
→How
to create an orthographic projection.
Key
points
→An
orthographic projection is
a 2-D representation of a 3-D object.
→A
system of drawings that represent different sides of an object.
→Project
edges perpendicular to planes of projection
→Represent
a shape using 2 or
more views
→Gives
enough information to manufacture
the part.
Orthographic
projection = 2-D representation of a 3-D
object.
Isometric view Orthographic view
An
orthographic projection represents different sides of an object.
The Six Principal Views
The
6 principal views are created by looking at the
object, straight on, in the directions indicated.
How
do we create the 6 principal views?
Consider
a pair of dice – each number is a view.
Choose one number for the front and then determine the remaining five
views.
The
object is placed in a glass box.
The
sides of the box represent the 6 principal planes.
Left, Front, Right, Rear, Top, Bottom
The
image of the object is projected on the sides of the box.
VISUALIZE !!!
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