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ENGINEERING GRAPHICS1E7

Lecture 11: Auxiliary Views

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Curved Objects

• Symmetrical reference plane

• Major axis can be found from direct projection from front view.

• Minor axis is diameter of the cylinder.

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Classification of Auxiliary Views

• Auxiliary views are classified according to the principal dimension of the object shown in the view.

1. Depth/Front auxiliary view

2. Height/Top auxiliary view

3. Width/Side auxiliary view

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Depth Auxiliary ViewAny auxiliary view projected from the ‘elevation’ showing depth of object Elevation is the adjacent view, Plan and Side-View are alternative views

Direction of sight

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Height Auxiliary ViewAny auxiliary view projected from the plan showing height of object Plan is adjacent view, Side-View and Elevation are alternative views

Direction of sight

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Width Auxiliary ViewAny auxiliary view projected from the side-view showing width of object Side-View is adjacent view, Plan and Elevation are alternative views

Direction of sight

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Revolving a Drawing

• Auxiliary view can be revolved to the position of a regular view.

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Other Auxiliary Views

• Any auxiliary view projected from the primary auxiliary view is secondary auxiliary view

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Example

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Example

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Partial Auxiliary Views

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Use of Auxiliary Views

In descriptive geometry auxiliary views are used to solve engineering problems. The four following auxiliary views are basic to solving problems in descriptive geometry:

1. Auxiliary view to show the true length of a line.

2. Auxiliary view to show the point view of a line.

3. Auxiliary view to show the edge view of a plane.

4. Auxiliary view to show the true size of a plane.

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Reverse Construction