Types Of Projection In Engineering Drawing

Projection in Engineering Drawing

Engineering drawing is an important tool for engineers and designers to communicate their ideas to other people. It is used to create visual representations of objects and parts of machines. A projection is the process of representing a three-dimensional object on a two-dimensional surface. There are several different types of projections used in engineering drawing.

First Angle Projection

First angle projection is the most widely used projection in engineering drawing. It is based on the concept of the object being projected onto a plane in front of the object. The object is viewed from the front and the other views are projected from the front view. The top view is projected above the front view, the right side view is projected to the right of the front view, and the left side view is projected to the left of the front view. This is the method used in the United States and most of Europe.

Third Angle Projection

Third angle projection is the opposite of first angle projection. It is based on the concept of the object being projected onto a plane behind the object. The object is viewed from the back and the other views are projected from the back view. The top view is projected below the back view, the right side view is projected to the left of the back view, and the left side view is projected to the right of the back view. This is the method used in Japan and parts of Asia.

Axonometric Projection

Axonometric projection is a type of projection used for isometric drawings. It is based on the concept of the object being projected onto a plane at an angle from the object. The object is viewed from the angle and the other views are projected from the angled view. The top view is projected above the angled view, the right side view is projected to the right of the angled view, and the left side view is projected to the left of the angled view. This is the method used for isometric drawings.

Oblique Projection

Oblique projection is a type of projection used for orthographic drawings. It is based on the concept of the object being projected onto a plane at an angle from the object. The object is viewed from the angle and the other views are projected from the angled view. The top view is projected above the angled view, the right side view is projected to the right of the angled view, and the left side view is projected to the left of the angled view. This is the method used for orthographic drawings.

Perspective Projection

Perspective projection is a type of projection used for perspective drawings. It is based on the concept of the object being projected onto a plane at an angle from the object. The object is viewed from the angle and the other views are projected from the angled view. The top view is projected above the angled view, the right side view is projected to the right of the angled view, and the left side view is projected to the left of the angled view. This is the method used for perspective drawings.

Projection in engineering drawing is an important tool for engineers and designers. It is used to create visual representations of objects and parts of machines. There are several different types of projections used in engineering drawing including first angle projection, third angle projection, axonometric projection, oblique projection, and perspective projection. Each type of projection is used for different types of drawings and has its own advantages and disadvantages. Understanding the different types of projections and how they are used is an important part of engineering drawing.