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It is mandatory to indicate the method of multiview projection by including the appropriate ISO (International Organization for Standardization) projection symbol – the truncated cone:

The three-view multiview drawing is the standard used in engineering and technology, because often the other three common views are mirror images and do not add to the knowledge about the object.

Square sections may be indicated by light crossed diagonal lines, as shown above, which applies whether the face is parallel or inclined to the drawing plane.

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It is one of the pictorial drawing pro­jections, which are useful for illustrative purposes, educational aids, installation and maintenance drawings, design sketches, and the like.

The advantage of multiview drawings over pictorial drawings is that multiview drawings shows the true size and shape of the various features of the object, whereas pictorials distort true dimensions which are critical in manufacturing and construction.

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Generally, three views of an object are enough, however, a drawing must contain as many views as necessary to illustrate the part, usually at right angles to one another.

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The top view is projected onto the horizontal plane of projection, which is plane suspended above and parallel to the top of the object.

A line of sight (LOS) is an imaginary line between an observer’s eye and an object. A plane of projection (i.e., an image or picture plane) is an imaginary flat plane upon which the image is projected. The projection is produced by connecting the points where the lines of sight pierce the projection plane. As a result, the 3D object is transformed into a 2D view.

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In multiview projection, the object is viewed perpendicular to the main faces, so that only one face of the object is depicted in each view. The frontal plane of projection is the plane onto which the front view of a multiview drawing is projected.

Axonometric projections such as isometric, dimetric, and trimetric projections are ortho­graphic, in that the projection lines are all parallel, but the angle of views is so chosen that three faces of a rectangular object would be shown in a single view.

A three-dimensional object can be repre­sented in a single plane, such as on a sheet of paper, using projecting lines and planes. All projection theory is based on two variables: line of sight (projecting lines) and plane of projection.

Axonometric drawings are classified by the angles between the lines comprising the axonometric axes. The axonometric axes are axes that meet to form the corner of the object that is nearest to the observer.

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The views should also be chosen to avoid hidden feature lines whenever possible. That means that the most descriptive view should be shown.

If desired, the rear view may be shown both ways – at the extreme left or the extreme right. When this is not practical to show rear view at he extreme left or right due to the length of the part, particularly with panels and mounting plates, the rear view should not be projected up or down, as this would result in its being shown upside down.

Besides, you should select the minimum number of views needed to completely describe an object. Eliminate views that are mirror images of other views.

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Instead, it should be drawn as if projected sideways, but located in some other position, and should be clearly labelled REAR VIEW REMOVED.

The width dimension is common to the front and top views. The height dimension is common to the front and side views. The depth dimension is common to the top and side views.

For simple parts one or two view drawings will often be enough. In one-view drawings the third dimension may be expressed by a note, or by descriptive words, symbols, or abbreviations, such as Ø, HEX, etc.

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In multiview drawings, the right side view is the standard side view. The right side view is projected onto the right profile plane of projection, which is a plane that is parallel to the right side of the object. However, you can also use the left side view if it is more descriptive and informative. Moreover, when needed, you can include both side views into one drawing.

The plane of projection can be oriented to produce an infinite number of views of an object. However, the most common views are the six mutually perpendicular views that are produced by six mutually perpendicular planes of projection:

By changing position of the object relative to the line of sight you can create different views of the same object. Drawing more than one face of an object by rotating the object relative to your line of sight helps in understanding the 3D form. Having several views on one drawing you use the concept of multi-view projection, which is based on the orthographic (parallel) projection technique where

If the distance from the observer to the object is finite, then the projection lines are not parallel (since all lines of sight start at a single point), and the drawing is classified as a perspective projection. In perspective view the object surface and projection plane can be also parallel.

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When all three angles are unequal the drawing is classified as a trimetric. When two of the three angles are equal the drawing is classified as a dimetric. When all three angles are equal the drawing is classified as a isometric.

To produce a new product, it is necessary to know its true dimensions, and true dimensions are not adequately represented in most pictorial drawings. For example, the photograph is a pictorial perspective image. However, as you can see, the image distorts true distances, while the latter are essential for manufacturing and construction, and in this example the case in question is the width of the road, not the electrical pole!

The number of views and sections must be limited to the minimum necessary to fully represent the object without ambiguity.

The front, rear, and side views are sometimes called elevations, e.g., front elevation. The top view may be termed the plan.

In first angle orthographic projections the object is considered as being rolled over to either side, so that the right side of the object is drawn to the left of the front elevation:

The most informative (descriptive) view of the object to be represented is normally chosen as the principal view (front view). This is view A related to the corresponding direction of viewing A and it usually shows the object in the functioning, manufacturing, or mounting position.

The Greek word axon means axis and metric means to measure. Axonometric projection is a parallel projection technique used to create a pictorial drawing of an object by rotating the object on an axis relative to a plane of projection.

As you can see, the two width dimensions in the front view of the block appear different in length in the perspective projection. In other words, equal distances do not appear equal on a perspective drawing.

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Thus, since engineering and technology depend on exact size and shape descriptions for design, the best approach is to use the parallel projection technique (orthographic projection) to create multi-view drawings where each view shows only two of the three dimensions (width, height, depth).

If the distance from the observer to the object is infinite, then the projection lines are assumed to be parallel, and the projection is called a parallel projection. Parallel projection is orthographic if the plane of projection is placed between the observer and the object, and the plane is perpendicular to the parallel lines of sight.

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