Difference Between First Angle Projection and Third Angle Projection

In third-angle projection, the view of a component is drawn next to where the view was taken. In first-angle projection, the view is drawn on the other end of the component, at the opposite end from where the view was taken.

1. What is the difference between 1st and 3rd angle projection?
2. Why do we use 1st and 3rd angle projection?
3. What is 3rd Angle Projection?
4. What is first angle projection?
5. Who uses 3rd Angle Projection?
6. Why don't we use 2nd and 4th angle projection?
7. What is the position of object in 3rd Angle Projection?
8. How do you find angle of projection?
9. Why is first angle projection used?
10. Is isometric drawing 2D or 3D?
11. What are the three planes of projection?

What is the difference between 1st and 3rd 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.

Why do we use 1st and 3rd angle projection?

So, just for the simplicity of drawing the orthographic views, we prefer first angle projection. In other words, Orthographic projection is a way of drawing a 3D object from different directions. The way in which we position these three views, differentiates third angle projection from first angle projection.

What is 3rd Angle Projection?

3rd Angle project is where the 3D object is seen to be in the 3rd quadrant. It is positioned below and behind the viewing planes, the planes are transparent, and each view is pulled onto the plane closest to it. The front plane of projection is seen to be between the observer and the object.

What is first angle projection?

First angle projection is a method of creating a 2D drawing of a 3D object. It is mainly used in Europe and Asia and has not been officially used in Australia for many years. In Australia, third angle projection is the preferred method of orthographic projection.

Who uses 3rd Angle Projection?

Orthographic Representation

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.

Why don't we use 2nd and 4th angle projection?

Overlapping projection views create confusion in the drawing. Therefore the 2nd angle projection system is not used to draw engineering drawings. Similarly when the object is placed in the 4th quadrant both top and front view will overlap. Therefore fourth angle projection is also not used.

What is the position of object in 3rd 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.

How do you find angle of projection?

1. The speed of a pojectile at its maximum height is half of its initial speed. The angle of projection is. ...
2. The time of flight of a projectile is related to its horizontal range by the equation gT2=2R. The angle of projection is. ...
3. A stone projected at an angle just clean a wall 100m. ...
4. Assertion.

Why is first angle projection used?

When these meeting points are joined in order on the plane they form an image, thus in the first angle projection, any view is so placed that it represents the side of the object away from it. First angle projection is often used throughout parts of Europe so that it is often called European projection.

Is isometric drawing 2D or 3D?

An isometric drawing is a 3D representation of an object, room, building or design on a 2D surface. One of the defining characteristics of an isometric drawing, compared to other types of 3D representation, is that the final image is not distorted. This is due to the fact that the foreshortening of the axes is equal.

What are the three planes of projection?

[FIGURE 3-2] Projections of the point are made onto three of the surfaces that make up the box: the top or "H" (horizontal) plane, the front or "F" (frontal) plane, and the right side or "P" (profile) plane.