# What are the theories and principles of orthographic projection?

## What are the theories and principles of orthographic projection?

The fundamental theory is rooted in the principles of solid geometry and need not concern us. The basic idea, so far as drawing is concerned, is that there are three planes mutually at right angles, like the sides of a box.

What are the principal planes in orthographic projection?

Orthographic projection uses two main planes called the principal planes of projection, they are the vertical plane planes and the horizontal planes. These two planes intersect, producing four quadrants.

### What is the theory of orthographic projection?

PROJECTION A method to describe shape by the process of causing an image to be formed by rays of sight taken in a particular direction from an object to a picture plane. If the rays are perpendicular to the picture plane, the projection is known as Orthographic Projection.

What are the principles of orthographic drawing?

Orthographic drawings are the projection of views on a drawing. It is necessary to show only enough views to show all the features. There are six basic views: top, front, bottom, back, right side and left side. The most commonly used are top, front and right side views.

#### What are the types of orthographic projection?

Three sub-types of orthographic projection are isometric projection, dimetric projection, and trimetric projection, depending on the exact angle at which the view deviates from the orthogonal.

What is projection theory?

Psychological projection is a defense mechanism in which the ego defends itself against unconscious impulses or qualities (both positive and negative) by denying their existence in themselves and attributing them to others. Projection has been described as an early phase of introjection.

## What is the main purpose of orthographic drawing?

An orthographic drawing is a clear, detailed way to represent the image of an object. It may be used by engineers, designers, architects, and technical artists to help a manufacturer understand the specifics of a product that needs to be created.

What are the different types of orthographic projection?

### What are the two types of orthographic projection?

First angle projections and third angle projections are the two main types of orthographic drawing, also referred to as ‘working drawings’. The difference between first and third angle projection is in the position of the plan, front and side views.

What is the theory of orthographic projection in drawing?

The fundamental theory is rooted in the principles of solid geometry and need not concern us. The basic idea, so far as drawing is concerned, is that there are three planes mutually at right angles, like the sides of a box. The views are projected onto these planes which are then developed or opened out into a flat sheet – the paper we draw on.

#### What do you mean by SV in orthographic projection?

SV is a view projected on PP. IMPORTANT TERMS OF ORTHOGRAPHIC PROJECTIONS: 1 Planes. 2 Pattern of planes & Pattern of views 3 Methods of drawing Orthographic Projections 4. PLANES1 PRINCIPAL PLANES HP AND VP AUXILIARY PLANES Auxiliary Vertical Plane Auxiliary Inclined Plane Profile Plane (A.V.P.)

How many sides do you need for an orthographic projection?

For a complete orthographic projection we should use all six sides of the box, producing six views in all. In third angle projection, Fig. 90, the object is imagined to be suspended within a transparent box, as shown at (a).

## What is the principle of projection in engineering drawing?

As the projectors are perpendicular to the plane on which the projection is obtained. this projection is known as an orthographic projection. It is shown separately in fig. 1-2. It can be seen that parallel edges of the object are shown by parallel lines, right angles remain as such and the semi-circle also remains a semi-circle.