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Auxiliary Views

Chapter 7

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Understanding Auxiliary Views

An auxiliary view is an orthographic view that

is not a standard projection

Auxiliary views allow principal faces offeatures that are not parallel to the standard

planes of projection to appear true shape and

size.

This is very important whendimensioning apart.

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Primary Auxiliary Views

A primary auxiliary view is projected onto a

plane that is perpendicular to one of the

principal planes of projection and is inclined

to the other two

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Auxiliary view in the Glass Box

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Classification of Auxiliary Views Auxiliary views are named for the principal

dimension shown in the auxiliary view such

as:

Depth auxiliary

Height auxiliary

Width auxiliary

The principal dimension is shown

perpendicular to the reference plane

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Primary Auxiliary Views

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Primary Auxiliary Views

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Revolving a Drawing

Some times it is easier to visualize anddraw

and auxiliary view when revolved to the

position of a regular view

It should be understood that an auxiliary view

basically is like any other view

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Revolving a Drawing

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Successive Auxiliary Views

From primary auxiliary views, a secondary

auxiliary view can be drawn

Third auxiliary views can be projected fromsecondary views

An infinite number of successive auxiliary views

may be drawn

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Successive Auxiliary Views

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Reference Planes

Instead of using one of the planes of

projection, reference planes parallel to the

plane of projection and touching or cutting

through the object are used in auxiliary views

Reference planes should be positioned so it is

convenient to transfer distances

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Reference Planes

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Reference Planes

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Reference Planes

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Circles and Ellipses in

Auxiliary Views

Circular shapes appear as elliptical when

viewed at an angle other than 90

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Hidden Lines in Auxiliary Views Generally hidden lines should be omitted in

auxiliary views unless they are needed to

clearly communicate the drawings intent

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Hidden Lines in Auxiliary Views

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Partial Auxiliary Views

Partial auxiliary views are often sufficient to

convey information and may be easier to read

Usually a break line is used to indicate the

imaginary break in the views

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Partial Auxiliary Views

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Half Auxiliary Views

If an auxiliary view is

symmetrical, and to

save space or time, a

half auxiliary view may

be drawn

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Auxiliary Sections

An auxiliary section is simply an auxiliary view

in section

The cutting plane line indicates both thelocation of the cutting plane and the direction

of sight for the auxiliary section

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Auxiliary Sections

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Uses of Auxiliary Views

Auxiliary views are used to show:

True length of a line

Point view of a line

Edge view of a plane

True size of a plane

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Steps for drawing Auxiliary Views

1. Determine the direction of viewing.

2. Number the vertices on the inclined plane ifneeded.

3. Draw projectors along the direction of sight. The projectors will be

perpendicular to the inclined edge.

4. Pick an appropriate folding line or reference plane.

5. Transfer measurements from the adjacent view onto the projectors.

6. Join the projected points to get true shape of inclined plane.

7. Transfer rest of the object onto the Auxiliary view if required to do so, else

close by drawing a break line. Omit hidden lines in Auxiliary views.