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Engineering Graphics, Class 9Auxiliary Views

Mohammad I. KilaniMechanical Engineering Department

University of Jordan

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Auxiliary Views

Inclined planes andoblique lines do notappear true length

or true size in anyof the principleplanes ofprojection

To determine thetrue length of anoblique line or thetrue size of aninclined plane, anauxiliary view mustbe created.

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Auxiliary Views

The base of the design for the bearing is shown in its true size, but therounded upper portion is situated at an angle with the planes of projection anddoes not appear in its true size and shape in any of the three regular views

To show the true circular shapes, it is necessary to assume a direction of sightperpendicular to the planes of those curves. The resulting view is know as anauxiliary view

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Definitions

Any view obtained by aprojection on a plane other thanthe horizontal, frontal, andprofile projection planes is an

auxiliary view

A primary auxiliary view isprojected onto a plane that isperpendicular to one of the

principal planes of projectionand is inclined to the other two

A secondary auxiliary view isprojected from a primary

auxiliary view into a plane thatis inclined to all three principalprojection planes.

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The Auxiliary Plane

In the figure below, the object has an inclined surface that does not appear inits true size and shape in any regular view. The auxiliary plane is assumedparallel to the inclined surface P

The auxiliary plane is then perpendicular to the frontal plane of projection andis hinged to it. The inclined surface is shown in its true size & shape in theauxiliary view. The long dimension of the surface is projected directly fromthe front view and the depth from the top view

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Depth Auxiliary Views

Auxiliary views are classified and named according to the principal dimensions ofthe object shown in the auxiliary view.

In depth auxiliary views the depth of the object is shown as a principal dimension.

The depth is shown in all views that are projected from the front view

An infinite number of depth auxiliary views can be shown.

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Depth Auxiliary Views

In the depth auxiliary views shown, the arrows indicate the directions of sight forthe several views, and the projection lines are respectively parallel to thesearrows. Actually, the projection lines determine the direction of sight, hence thearrows may not be needed.

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Depth Auxiliary Views

Any one of these five plane is an auxiliary plane The principal dimensions shownin an auxiliary view is the one not shown in the adjacent view from which theauxiliary view was projected

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Height Auxiliary Views

An infinite number of auxiliary views can be assumed perpendicular to , andhinged to, the horizontal plane of projection. These views show the principaldimension, height, therefore all the auxiliary views are height auxiliary views

Note that in the view projected from, which is the top view , the only dimensionsnot shown is height

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Width Auxiliary Views

Also, an infinite number of auxiliary views can be assumed perpendicular to , andhinged to, the profile plane of projection. These views shows the principaldimension, width, therefore all the auxiliary views are width auxiliary views

Note that in the right-side view from, which the auxiliary views are projected, theonly dimensions not shown is width

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Uses of auxiliary views

Generally, auxiliary views are used to show the trueshape or true angle of features that appear distorted inthe regular views

Basically, auxiliary views have the following four uses:

True length of line

Point view of line

Edge view of plane

True size of plane

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Hidden lines in auxiliary views

In practice, hidden lines should be omitted in auxiliaryviews, unless they are needed for clearness

The beginner, however, should show all hidden lines,especially if the auxiliary view of the entire object isshown.

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Drawing Simplification by Auxiliary Views

The use of auxiliary view often makes it possible to omit one or more regularviews and thus to simplify the shape description.

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Partial Auxiliary Views

Three complete auxiliary view drawings are shown. To make such drawingstakes a great deal of time, particularly when ellipses are involved.

The completeness of detail may add nothing to clearness or may even detract

from it because of the clutter of lines. However, in these cases, some portionof every view is needed - no view can be completely eliminated.

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Partial Auxiliary Views

Partial views are often sufficient, and the resulting drawings are considerablysimplified and easier to read.

Partial regular views and partial auxiliary views are used with the same result.

Usually a break line is used to indicate the imaginary break in the views.

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Partial Auxiliary Views

To clarify the relationship of views, the auxiliary views should be connected tothe views from which are projected, either with a center line or with one ortwo projection lines.

This is particularly important for partial views, which are often small andappear to be lost and not related to any view

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Half Auxiliary Views

If an auxiliary view issymmetrical, and it isnecessary to save

space on the drawingor to save time indrafting, only half ofthe auxiliary view maybe drawn