ADDA Section View Standards and Terms

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ADDA Section View Standards and Terms
2012-06-27 20:59:31
adda mechanical drafting general section view identification

Study for ADDA Mechanical Drafting certification General Section View Identification and Terms
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  1. Aligned Section
  2. Bar
  3. Broken-Out Section
  4. Full Section
  5. Half Section
  6. Offset Section
  7. Removed Section
  8. Revolved Section
  9. Rod
  10. Tube
  11. Wood
  12. Full Section
    The cutting plane line extends straight though the object, generally at the centerline of symmetry.
  13. Half Section
    • The cutting plane passes half way through the object, removing one fourth of the object.
    • • Half sections are most applicable to symmetrical objects to show both the interior and exterior in a single view.
    • • A centerline is used between the sectioned and the unsectioned half.
  14. Offset Section
    To include features that do not appear in a straight line, the cutting plane may be offset to pass through the features. Offsets or bends created by the cutting plane are not shown on the section view.
  15. Aligned Section
    The cutting plane is offset to pass through features that are then rotated into a plane perpendicular to the line of sight of the section view.
  16. Broken-Out Section
    Where only a portion of the object needs to be shown in the section. The section is limited by a short (freehand) break line. No cutting plane line is required.
  17. Revolved Section
    A cutting plane line is passed through the object and revolved 90° in place towards the plane of the drawing. Used to show the cross section of a spoke, bar, rib, etc.
  18. Removed Section
    • A section that is not a direct projection from the view with the cutting plane. The section view is generally moved from its normal projection position, but must remain in its true orthographic orientation.
    • • Removed sections are often drawn at a scale different from the view it was taken from.
    • • Center lines may extend from the imaginary cutting plane to the removed section provided it is symmetrical.
  19. Ribs/Webs/Keyways
    Webs, ribs, gear teeth and other like features are not sectioned to avoid giving a false impression of the parts thickness.
  20. What is the function of a section view?
    To show complicated interiors of parts that are difficult to interpret through the use of hidden lines.
  21. Explain the function of the cutting plane line and it’s application for the different section view types.
    • To indicate the location of the imaginary cut made to reveal interior details.
    • Identify the line of sight for the individual view in the part through the use of arrows.
    • If 2 or more sections are present; identify the particular sections through the use of letter identifiers.
  22. Explain the application of section lines and their forms.
    • Cast iron, .125” uniformly spaced thin lines, is the general-purpose section line.
    • Section lines should all be at the same angle for a single part. Section lines at different angles on the same drawing indicate more than one part.
    • Section lines should not be drawn vertical, horizontal or parallel to an adjacent object line of the drawing.
    • Section lines can identify the general class of material such as steel, brass or rubber.
    • Thin items such as gaskets or sheet metal are shown unsectioned.