AUXILIARY VIEWS

The preceding units showed that six basic views can be used to represent an object: front, top, right side, left side, bottom, and back. The proper selection and arrangement of several of these views are usually suf­ficient to represent an object. However, when an object has a slanted (oblique) face, an auxiliary view may be included on the print to show the plane of the slanted surface more clearly.

other view, this surface is distorted or foreshortened.

The auxiliary view represents a view of the slanted surface from a position at right angles (90°, perpen­dicular) to it, Figure 7.4. The surface represented in this manner is shown in its true size and shape. In any

FIGURE 7.4 ■ Position for viewing an auxiliary view.

The development of the auxiliary view is some­times shown by lines projected perpendicularly from the slanted surface. Usually, only that part of the view that represents the slanted surface is shown, Figure 7.5. A short break line indicates the extent of the view. Dimensions are applied to auxiliary views in the same manner as for other views.

The number of auxiliary views required depends on the number of slanted surfaces an object has. For example, Figure 7.6 shows the auxiliary views used to show the true shape of each of the two oblique surfaces of an object.

FIGURE 7.5 ■ Auxiliary view as a partial view. FIGURE 7.6 ■ Multiple auxiliary views.

USE OF BOTH RIGHT SIDE AND LEFT SIDE VIEWS

In general, only a right or left side, top, and front views are required to show clearly all details needed to fab­ricate a part. However, when the part is very detailed, both right and left side views are shown in addition to the top and front views of the part.

When both side views are included on a print, they are invariably shown as partial views; that is, whatever details are shown in the right side view are not shown in the left side view, and vice versa. Presentation of the details in this manner makes reading the print much easier.

Figure 7.7 illustrates the use of two side views and a front view. Note the detail that is eliminated from one side when shown in the other side view.

ALTERNATE POSITIONS OF SIDE VIEW

FIGURE 7.8 ■ Alternate positions of side

As stated in Unit 1, the side view is normally found adjacent to the front view. However, when this location is not possible due to limited space, the side view is placed next to and in line with the top view. As a result, the space needed to show the three views is reduced, Figure 7.8. Note also that the side view can be placed to the left of either the front view or the top view.

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