Reading Prints of Pictorial Drawings

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CHAPTER 16

• Reading Prints of Pictorial Drawings

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Learning Objectives

• Identify types of pictorial drawings
• Read pictorial drawing prints

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Pictorial Drawings

• Often accompany 2-D orthographic multiviews
• Provide a realistic 3-D view
• Help improve visualization
• ASME Y14.4M, Pictorial Drawing standard

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Pictorial Drawings

• Useful for a variety of applications
• Clarify basic and complicated engineering designs
• Help designers and engineers work out spatial
  problems
• Most often the basis for technical illustrations

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Pictorial Drawings
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Uses of Pictorial Drawings

• Design
• Instruction manuals
• Parts catalogs
• Advertising literature

• Technical reports
• Presentations
• Assembly
• Construction

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Isometric Drawings

• Equal (iso) measure (metric)

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Isometric and Nonisometric Planes

• Insert 16.6

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Regular Isometric

• Most common
• View the top of the object and the object from
  either side

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Reverse Isometric

• View the bottom of the object
• Insert 16.8b, remove b title

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Long-Axis Isometric

• Common for long objects
• Insert 16.8c, remove c title

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Isometric Sections
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Isometric Dimensions

• Uncommon practice
• Sometimes used for isometric piping drawings

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Isometric Dimensions
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Exploded Pictorial Drawings

• Exploded assembly
• Show the relationship of parts in a realistic
  manner
• Commonly used in
• Parts catalogues
• Owner's manuals
• Assembly instructions

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Exploded Pictorial Drawings

• Isometric drawings most common
• Can include centerlines between part and
  subassembly axes
• Can use solid extension lines between
  non-cylindrical features, parts, and
  subassemblies
• Can include balloons

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Exploded Pictorial Drawing
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Oblique Drawing

• Shows three faces of the object
• Useful if one face of an object needs to be shown
  flat

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Cavalier Oblique
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Cabinet Oblique
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General Oblique
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Perspective Drawings

• Most realistic pictorial illustration
• Show depth and distortion perceived by the human
  eye
• Objects appear smaller the farther away they are
  until they vanish at a point on the horizon
• One-point or parallel perspective
• Two-point or angular perspective
• Three-point perspective

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Glossary

• Balloon
• A circle placed on the drawing with a part
  identification number inside the circle. Each
  balloon is connected to its related part with a
  leader line. The balloon part identification
  number correlates to the same number identifying
  the part in the parts list. The parts list
  identifies every part in the assembly.

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Glossary

• Exploded assembly
• A pictorial assembly showing all parts removed
  from each other and aligned along axis lines.
• Oblique drawing
• A form of pictorial drawing in which the plane of
  projection is parallel to the front surface of
  the object.

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Glossary

• One-point or parallel perspective
• A perspective drawing with one vanishing point.
• Three-point perspective
• A perspective drawing with three vanishing
  points.
• Two-point or angular perspective
• A perspective drawing with two vanishing points.