Auxiliary Views

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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 of features
  that are not parallel to the standard planes of
  projection to appear true shape and size.
• This is very important when dimensioning 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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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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Primary Auxiliary Views
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Revolving a Drawing

• Some times it is easier to visualize and draw 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 from
  secondary 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

• Reference lines, like folding lines, are always
  at right angles to the projection lines between
  the views
• A reference plane appears as a line in two
  alternate views, never in an adjacent view

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Reference Planes

• Measurements are always made at right angles to
  the reference lines or parallel to the projection
  lines
• In the auxiliary view, all points are at the same
  distances from the reference line as the
  corresponding points are from the reference line
  in the alternate view, or the second previous view

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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 the
  location 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