Chapter 14 Axonometric Projection

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Chapter 14 Axonometric Projection

• (Pictorial Drawing)

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Given This!
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Draw this!
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Types of Axonometric Projection

• Isometric has equal foreshortening along each
  of the three axis directions
• Dimetric has equal foreshortening along two
  axis directions and a different amount on the
  third axis
• Trimetric has different foreshortening along
  all three axis directions

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Types of Axonometric Projection
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Isometric Projection

• The projections of the edges of a cube in
  isometric projection make angles of 120 degrees
  with each other

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Isometric Projection

• Lines of an isometric drawing that are not
  parallel to the isometric axes are called
  nonisometric lines
• These lines are not equally foreshortened

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Isometric Projection

• Isometric scales can be used to draw correct
  isometric projections
• All distances are approximately 80 of true size

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Isometric Drawings

• Isometric drawings, unlike isometric projections,
  are drawn using the full length measurements of
  the actual drawing and lacks foreshortening
• The isometric drawing is about 25 larger than
  the isometric projection

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Iso Paper
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Making an Isometric Drawing
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Sketch an Isometric Drawing
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Iso Paper
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SOLUTION
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Sketch an Isometric Drawing
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Iso Paper
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SOLUTION
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Hidden Lines and Centerlines

• Hidden lines are omitted unless they are needed
  to make the drawing clear
• Center lines are shown if they are needed to
  indicate symmetry or if they are needed for
  dimensioning

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Angles in Isometric

• Angles project true size only when the plane
  containing the angle is parallel to the plane of
  projection
• An angle may project to appear larger or smaller
  than the true angle depending on its position

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Ellipses in Isometric

• If a circle lies in a plane that is not parallel
  to the plane of projection, the circle projects
  as an ellipse
• Ellipses can be constructed using offset
  measurements

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Ellipses in Isometric

• Approximate ellipses can be constructed from arcs

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Drawing Ellipses
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Drawing Isometric Cylinders
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Irregular Objects
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Irregular Objects
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Curves in Isometric
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Screw Threads in Isometric

• Parallel partial ellipses equally spaced at the
  symbolic thread pitch can be used to represent
  screw threads

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Arcs in Isometric
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Intersections
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Spheres in Isometric
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Isometric Sectioning

• Isometric sectioning is useful in drawing open or
  irregularly shaped objects

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Isometric Dimensioning

• Isometric dimensions are similar to dimensions on
  multiview drawings but should match the pictorial
  style

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Exploded Assemblies
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Piping Diagrams
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Sketch an Isometric Drawing
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Solution
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Iso Paper
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Sketch an Isometric Drawing
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Iso Paper
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Solution