Difference Between First And Third Angle Projection Pdf

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difference between first and third angle projection pdf

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First Angle and Third Angle are two methods orthographic projection used in technical drawing and normally comprises the three views perspectives : front, top and side. In other words, Orthographic projection is a way of drawing a 3D object from different directions. Usually front, top and side views are drawn so that a person looking at the drawing can see all the important sides.

First angle projection and Third angle projection are two different methods of creating a 2D drawing of a 3D part.

First angle projection and third angle projection are the vocabularies of technical drawings. These are the latest standards used in engineering drawings to communicate design intent among different stockholders. In simple words, 1st angle projection and 3rd angle projection are the types of Orthographic Projection system which is used to project three-dimension objects into two-dimensional projection view.

First Angle Projection Vs Third Angle Projection

First angle projection and third angle projection are the vocabularies of technical drawings. These are the latest standards used in engineering drawings to communicate design intent among different stockholders.

In simple words, 1st angle projection and 3rd angle projection are the types of Orthographic Projection system which is used to project three-dimension objects into two-dimensional projection view. Orthographic projection works on the principle of projecting views to imaginary planes which are called reference planes.

In 2D drafting, you can have two planes perpendicular to each other and normal to the human eye. One plane is in the X- Direction and the other is in Y Direction. These two reference planes, when placed at the perpendicular, creates a four-quadrant where you can place a 3D object to project views.

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. In the first angle projection, the object is placed between the observer and projection planes.

The plane of projection is taken solid in 1st angle projection. In the third angle projection, the object is placed in the third quadrant. The object is placed behind the vertical planes and the bottom of the horizontal plane. Third angle projection is widely used in the United States.

In the third angle projection, the projection planes come between the object and observer. The plane of projection is taken as transparent in the 3rd angle projection. Out of these six views, three views Front, Top, Right are important and most of the drawings usually have these three views. First angle projection and third angle projection can be broadly differentiate based on a couple of criteria as mentioned below. In the first angle projection, the object is placed between the object and projection planes.

In the third angle projection, the object is placed behind the projection planes. In the first angle projection, the projection planes are at the behind and bottom of the object. In the case of third angle projection, projection planes are front and top of the object. The only way to figure it out is by looking at the projection symbol.

The view Placement differs in 1st angle projection and 3rd angle projection due to the different positions of projection planes. The right side view is placed on the left side of the front view. The left side view is placed on the right side.

In the third angle projection, the front view is placed below the unfolded line and the top view is placed above. The right side view is placed on the right side and the left side view is placed on the left of the front view. To sum up, first angle projection and third projection are just two types of orthographic projection types that are widely used to create a two-dimensional drawing.

If you have any questions regarding first angle projection vs third angle projection, then do ask in the comment section and I will be happy to respond. Also if you do feel that I missed something to add here, you can raise that in the comment section. You may also like to read: Evolution of CAD software.

Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Table Of Contents. First Angle Projection. Third Angle Projection. About The Author. Leave a Comment Cancel Reply Your email address will not be published. Front view is at the top of the horizontal axis. Front view at the bottom of the horizontal axis.

Right view is at the left side of vertical axis. Right view is at the right side of vertical axis. Left view is at the right side of vertical axis. Left view is at the left side of vertical asxis.

7 Difference Between First Angle And Third Angle Projection (With Diagram & Symbols)

Every engineer must know how to read engineering drawings and the most integral part of this is knowing the difference between first and third angle projection. A collection of 2D drawings can be used to represent a 3D object in orthographic projection and consists of six orthographic views Top, Bottom, Right, Left, Front and Back view also known as six principle views. Out of these six, front, right side and top view are the most commonly used ones. But how do you get these orthographic views from a 3D object? We essentially have two main types of projection techniques, the First angle projection, and the Third angle projection. Both of them do the same job, but there are differences in the way we get the results.


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What is The Difference Between First And Third Angle Projection? A Mechanical Engineer Explains

This is one of the most common topics of discussion in the community of mechanical engineers and designers alike. Ask any professional with a hands-on experience of design and tools, he or she will say this is nothing but the means of representing three-dimensional objects in two dimensions. First and third angle projection are nothing but ways of describing what an object looks like from different directions. This is called orthographic projection and orthographic is nothing but engineering drawings or plan views. This is one of the most common methods used to obtain engineering drawings, mostly for orthographic projections.

These planes are considered to be transparent and to be of infinite size. Hence the top view or plan of the object will be obtained below the reference line and the front view or elevation above the reference line. The aim of an engineering drawing is to convey all the necessary information of how to make the part to the manufacturing department. For most parts, the information cannot be conveyed in a single view.

What is First Angle Projection?

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2 Comments

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  2. Rrilmacurkitt 18.05.2021 at 16:25

    Collection of 2D drawings which enables you to have a complete representation of an object is called orthographic projection.