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# Difference Between First And Third Angle Projection Pdf

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## Difference Between First Angle Projection and Third Angle Projection

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. Divide the plane into four quadrants.

For the first angle projection, place the object in the first quadrant and in the third quadrant for the third angle projection. The object is placed between the plane of projection and observer for the first angle projection and between the object and observer for the third angle projection. The plane of projection is taken solid in the first angle of projection while transparent in the third.

The views come like this in the first angle projection starting from top left, clockwise, Right view, Front view, and Top view. In the third angle projection right view is on right side of front view with the top view sitting at the top of the front view. Your email address will not be published.

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

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. 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. In first angle, the object is placed in the first quadrant.

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.

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

Collection of 2D drawings which enables you to have a complete representation of an object is called orthographic projection. Collection of 2D drawings consist of six orthographic views Top, Bottom, Right, Left, Front and Back view also called as six principle views. From these six orthographic views front, right side and top view are most commonly used to represent the orthographic projection of an object.

### First Angle Projection Vs Third Angle Projection

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. Orthographic projection is a graphical method used to represent three-dimensional structures or objects into different perspective projection images called views. The orthographic view typically consists of the top view, front view, and the side view.

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. Rather than using several sheets of paper with different views of the part, several views can be combined on a single drawing using one of the two available projection systems, first angle, and third angle projection.

Orthographic Projection is a way of drawing an 3D object from different directions. Usually a front, side and plan view are drawn so that a person looking at the drawing can see all the important sides. Orthographic drawings are useful especially when a design has been developed to a stage whereby it is almost ready to manufacture. They differ only in the position of the plan, front and side views. Below is an example of F irst Angle projection. Opposite is a simple L-shape, drawn in three dimensions.

Description: Both third angle and first angle projection display the standard three orthographic views of a part or assembly. The key difference between third.

#### What Is First Angle Projection

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.

The orthographic projection system is used to represent a 3D object in a 2D plane. The orthographic projection system utilizes parallel lines, to project 3D object views onto a 2D plane. According to the rule of orthographic projection. To draw a projection view of a 3D object on a 2D Plane. The horizontal plane is rotated in the clockwise direction.

First angle projection and Third angle projection are two different methods of creating a 2D drawing of a 3D part. First Angle Projection is commonly used in all countries other than United States. It is mainly used in Europe and Asia countries. Following table describes what is the difference between or comparison between First Angle Projection vs Third Angle projection. Following are the details description of first angle projection vs third angle projection given in text note from above table for better readability.

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