May 21, 2024  
2022-2023 College Catalog 
    
2022-2023 College Catalog [ARCHIVED CATALOG]

CAD 172 - Geometric Dimensioning and Tolerancing

3 Credits, 3 Contact Hours
3 lecture periods 0 lab periods

Establishing controls on sizes and allowances of mechanical parts. Includes definitions and rules, form tolerances, datums, orientation controls, location controls, runout, and profile.

Prerequisite(s): CAD 117  or CAD 142 .
Information: Prerequisites may be waived if equivalent mechanical drawing experience is documented. See CAD instructor or advisor/counselor.
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Course Learning Outcomes
  1. Discuss the importance of geometric dimensioning and tolerancing.
  2. State definition and rules of geometric dimensioning and tolerancing with symbol identification.
  3. Define form tolerances and their uses.
  4. Define datums and their use.
  5. Define orientation controls and their uses.
  6. Define location controls and their uses.
  7. Identify circular and total runout requiring one or two datums.
  8. Define profile and its uses.

Outline:
  1. Introduction to Geometric Dimensioning and Tolerancing
    1. Engineering drawings and part cost impact
    2. Correct part tolerance
    3. ASME 14.5
    4. ISO compatible
  2. Definitions and Rules
    1. Terms
    2. Features versus features-of-size
    3. Peculiar sizes
    4. Material condition
    5. Feature control frames
    6. Basic dimensions
    7. Datum identifiers
    8. Three major rules
    9. Virtual size, virtual condition
  3. Form Tolerances
    1. Shared attributes
    2. Flatness
    3. Straightness
    4. Maximum material condition
    5. Virtual condition
    6. Circularity
    7. Cylindricity
  4. Datums
    1. Datum planes
    2. Surfaces
    3. Feature-of-size
    4. Material condition modifiers
    5. Virtual condition
  5. Orientation Controls
    1. Control features and features-of-size
    2. Perpendicularity
    3. Parallelism
    4. Angularity
  6. Location Control
    1. Position
    2. Axis and boundary control equivalency
    3. Application rules
    4. Fixed and floating fasteners
    5. Maximum material condition and bonus tolerance
    6. Receiver gages
    7. Regardless of feature size
    8. Least material condition and application
    9. Paper gages
    10. Concentricity
  7. Runout
    1. Circular runout
    2. Total runout
  8. Profile
    1. Profile of a line
    2. Profile of a surface