Table of Contents
- 1 Why do we use first angle projection rather than third angle projection?
- 2 Why we use first angle projection in India?
- 3 What is the difference between 1st angle and 3rd angle projection?
- 4 What is 1st angle projection in civil engineering?
- 5 What is the difference between first angle and third angle drawings?
Why do we use first angle projection rather than third angle projection?
In India, we generally use 1st angle projection. Generally, we view a body as if it is in the first quadrant. So, just for the simplicity of drawing the orthographic views, we prefer first angle projection.
Does America use first or third angle projection?
The two orthogonal projection methods used internationally are first angle projection and third angle projection. Third angle projection (figure 1.2) is used mainly in The United States and Canada whilst first angle projection (figure 1.1) is used mainly throughout Europe and the rest of the world.
Which angle of projection is not used in India?
To sum up, Because of the overlapping of front and top views 2nd and 4th angle projections are not used. First and third angle projection systems are recommended for orthographic projections.
Why we use first angle projection in India?
In the first angle projection, the object is placed in the 1st quadrant. The object is positioned at the front of a vertical plane and top of the horizontal plane….Difference between First Angle Projection and Third Angle Projection :
| SR.NO | First Angle Projection | Third Angle Projection |
|---|---|---|
| 8 | It is widely used in Europe, India, Canada. | It is widely used in United State and Australia. |
What is difference between first angle projection and Third angle projection?
To get the first angle projection, the object is placed in the first quadrant meaning it’s placed between the plane of projection and the observer. For the third angle projection, the object is placed below and behind the viewing planes meaning the plane of projection is between the observer and the object.
What is the difference between first and third angle projection?
What is the difference between 1st angle and 3rd angle projection?
What is difference between first and third angle projection?
The object is placed behind the vertical planes and bottom of the horizontal plane. Third angle projection is widely used in the United States….Difference between First Angle Projection and Third Angle Projection :
| SR.NO | First Angle Projection | Third Angle Projection |
|---|---|---|
| 3 | The plane of projection is opaque. | The plane of projection is transparent. |
What is difference between 1st angle projection and 3rd angle projection?
What is 1st angle projection in civil engineering?
1. First Angle Projection : In the first angle projection, the object is placed in the 1st quadrant. The object is positioned at the front of a vertical plane and top of the horizontal plane. First angle projection is widely used in India and European countries. The object is placed between the observer and projection planes.
What is third angle projection?
Third Angle Projection : In the third angle projection, the object is placed in the third quadrant. The object is placed behind the vertical planes and bottom of the horizontal plane. Third angle projection is widely used in the United States. The projection planes come between the object and observer.
What is 1st quadrant projection?
1. First Angle Projection : In the first angle projection, the object is placed in the 1st quadrant. The object is positioned at the front of a vertical plane and top of the horizontal plane. First angle projection is widely used in India and European countries.
What is the difference between first angle and third angle drawings?
Orthographic drawings are useful especially when a design has been developed to a stage whereby it is almost ready to manufacture. First angle and third angle only differ in the position of the top, front and side views. First angle projection is a method of creating a 2D drawing of a 3D object.