The document discusses first angle projection as a method of orthographic projection. First angle projection represents a 3D object with 2D drawings, including a front elevation, side elevations, and plan view. It aims to provide a precise detailed drawing of an object using these 2D orthographic views. Key rules for first angle projection include showing the front view with the most detail and placing the end view on the right or left side depending on the viewing perspective.

1. By Mr. Curtis Marcelle and Mrs. Kya Morris
ORTHOGRAPHIC
PROJECTION – FIRST
ANGLE

2. • Develop an overall understanding of First Angle Projection
• Define the term “first angle projection” as it relates to orthographic
projection
• Identify the rules for drawing in first angle projection
• Recognize any “first angle projection” in Technical Drawing
• Draw orthographic projections of geometric solids and models using
first angle projection
• Convert 3D/pictorial drawings into 2D/orthographic projection
drawings
• Value the use of First Angle Projection
OBJECTIVES

3. • The collection of two-dimensional drawings that gives
an accurate overall representation of a particular object.
• There are basically two types of orthographic projection
• These are: First angle projection and Third angle
projection
WHAT IS AN ORTHOGRAPHIC
PROJECTION

4. • A method of projection in which a three-dimensional
object is represented by two-dimensional drawings.
FIRST ANGLE PROJECTION

5. • The purpose of first angle projection is to give a more
precise detailed drawing of the particular object or
geometrical part using two-dimensional drawings.
PURPOSE OF FIRST ANGLE PROJECTION

6. • We mainly represent three/four parts of an object in first
angle projection.
• These are the Front elevation, Side elevation (left/right)
and Plan (top view).
PARTS OF A FIRST ANGLE PROJECTION

7. When using first angle projection, we use the symbol:

8. Process…

10. •The ‘front elevation’ (or front view) is the view
with the most information of the object.
•The ‘plan’ is always below the front elevation (first
angle projection).
•The ‘end view’ is placed on the right if viewed
from the left side of the object and on the left if
viewed from the right side of the object.
POINTS TO REMEMBER

11. •There are two types of orthographic projections:
First and Third angle.
•First angle projection is a method of projection in
which a three-dimensional object is represented by
two-dimensional drawings.
•It gives a more precise detailed drawing of the
particular object or geometrical part (purpose).
•Front elevation, Side elevation (left/right), and Plan
(top view).
CONCLUSION

12. Lets give it a try…