Geometric Dimensioning & Tolerancing Quiz
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Questions and Answers

What is concentricity in GD&T?

  • A measure of how closely a feature is aligned with a datum plane
  • A 3-Dimensional cylindrical tolerance zone defined by a datum axis (correct)
  • A tolerance that ensures a feature is symmetrical about a datum axis
  • A tolerance that ensures all points on a feature are equidistant from a datum axis

    • What must be true for a cylindrical feature to meet the concentricity tolerance?

  • The feature must be coaxial with the datum axis
  • The feature must have a constant diameter along its length
  • The feature must be perfectly circular in cross-section
  • All median points along the entire feature must be within the tolerance zone (correct)

    • What is the primary purpose of position tolerances in GD&T?

  • To control the form of a feature
  • To control the size of a feature
  • To control the orientation of a feature
  • To locate features from datums or establish coaxiality or symmetry (correct)

    • What does a position tolerance define?

    <p>The maximum allowable deviation from the true position of a feature</p> Signup and view all the answers

    What is the 'true position' in GD&T?

    <p>The theoretically exact position of the feature</p> Signup and view all the answers

    What is symmetry in GD&T?

    <p>A condition where the median points of opposed feature surfaces are coincident with a datum axis or center plane</p> Signup and view all the answers

    If a feature meets the symmetry tolerance, what can be inferred?

    <p>The opposed elements of the feature are aligned with the datum axis or plane</p> Signup and view all the answers

    What is the relationship between concentricity and symmetry tolerances?

    <p>Concentricity controls circularity, symmetry controls opposed element alignment</p> Signup and view all the answers

    If a position tolerance is given, what does it NOT control?

    <p>Size of the feature</p> Signup and view all the answers

    What tolerance would be used to ensure two holes are coaxial?

    <p>Position</p> Signup and view all the answers

    Study Notes

    Geometric Dimensioning and Tolerancing (GD&T)

    Form and Profile Controls

    • 14 characteristics that may be controlled, including:
      • Flatness
      • Straightness
      • Circularity
      • Cylindricity
      • Line Profile
      • Surface Profile

    Form Controls

    • Flatness: a perfectly flat surface must contain all elements in one plane
    • Straightness: an element of a surface or an axis is a straight line
    • Circularity (roundness): all points of the surface intersected by any plane perpendicular to a common axis are equidistant from the axis
    • Cylindricity: controls the surface of a cylinder, including parallelism of the sides

    Profile Controls

    • Line Profile: controls single line elements on a feature, each element is independent of all others
    • Surface Profile: controls all elements on a feature, simplest level of control, controls form only

    Orientation, Runout, and Location Controls

    • 14 characteristics that may be controlled, including:
      • Perpendicularity
      • Angularity
      • Circular Runout
      • Total Runout
      • Concentricity
      • Position
      • Symmetry

    Orientation Controls

    • Perpendicularity: two parallel planes of cylindrical zones that are perpendicular to a datum plane
    • Angularity: a surface, center-plane or axis at a specified angle (other than 90°) form a datum plane or axis
    • Parallelism: two parallel planes of cylindrical zones that are parallel to a datum plane

    Runout Controls

    • Circular Runout: controls circularity and concentricity, measured by rotating the part 360°
    • Total Runout: controls cumulative variations of circularity, straightness, coaxiality, angularity, taper, and profile of a surface

    Location Controls

    • Concentricity: a 3-Dimensional cylindrical tolerance zone defined by a datum axis
    • Position: locates features from datum’s or establishes coaxiality or symmetry
    • Symmetry: median points of all opposed or correspondingly-located elements of two or more feature surfaces are coincident with the axis or center plane of a datum feature

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    Description

    Test your knowledge of Geometric Dimensioning & Tolerancing (GD&T) concepts with this quiz. Explore topics such as form, profile, characteristic controls, feature types, and tolerance symbols.

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