Dimensioning and Tolerancing Quiz
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Questions and Answers

Which type of clearance fit is characterized by freedom of assembly and disassembly but provides a snug fit for static parts?

  • Force or Shrink Fit
  • Sliding Fit
  • Loose Running Fit
  • Locational Clearance Fit (correct)

    • What does profile tolerance control when datums are not specified?

  • Orientation of a surface or axis
  • Dimensional accuracy of a feature
  • Size and location of the feature
  • Shape of the contour only (correct)

    • Which of the following is NOT a characteristic of free running fits?

  • They are good for large temperature variations.
  • They are not for use when accuracy is essential.
  • They are suitable for high running speeds.
  • They maintain constant bore pressures. (correct)

    • In baseline dimensioning, how are the dimensions oriented?

    <p>They originate from a single base or datum.</p> Signup and view all the answers

    What does symmetry tolerance control relative to an axis or datum feature?

    <p>The location of a center plane</p> Signup and view all the answers

    What is the primary use of optical comparators in inspection?

    <p>To check profile tolerances</p> Signup and view all the answers

    Which dimensioning systems are most commonly used in technical drawings?

    <p>SI and U.S. Customary</p> Signup and view all the answers

    What is the required spacing between dimension lines when placed outside other dimensions?

    <p>6 mm</p> Signup and view all the answers

    What is true about dimensioning chamfers?

    <p>They are dimensioned using a length and an angle or two distances.</p> Signup and view all the answers

    What does the feature control frame contain in relation to geometric tolerancing?

    <p>Geometric characteristic symbol, tolerance, and relative datums</p> Signup and view all the answers

    When are chain dimensioning techniques typically used?

    <p>When features are dimensioned relative to one another</p> Signup and view all the answers

    Which aspect of chain dimensioning is generally seen as a disadvantage?

    <p>It often leads to larger accumulation of tolerances.</p> Signup and view all the answers

    What does the symbol '|' represent on a technical drawing?

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

    In what condition do all dimensions and tolerances apply, particularly for rigid parts?

    <p>Free state</p> Signup and view all the answers

    What do form tolerances relate to?

    <p>Individual features unrelated to any datums</p> Signup and view all the answers

    At what point is a zero not used before the decimal point for linear measurements?

    <p>For values less than 1 inch</p> Signup and view all the answers

    How much spacing should there be between extension lines and the geometry of the object being dimensioned?

    <p>1 mm</p> Signup and view all the answers

    Where do notes typically appear on a drawing and are applicable to the whole drawing?

    <p>Lower right-hand corner</p> Signup and view all the answers

    What is indicated when a dimension is stated theoretically as perfect?

    <p>It specifies the ideal conditions from datums</p> Signup and view all the answers

    If a dimension exceeds a whole number by a decimal fraction of one millimeter, what should be done with the last digit to the right of the decimal point?

    <p>It should be left as is</p> Signup and view all the answers

    What does the nomenclature 'TYP' or 'TYPICAL OF' indicate?

    <p>A feature that is repeated exactly a certain number of times</p> Signup and view all the answers

    In the context of dimensioning a design, what does a unilateral tolerance refer to?

    <p>All deviation in one direction from the basic size</p> Signup and view all the answers

    Which of the following best describes an interference fit?

    <p>A fit that always has overlapping material between parts</p> Signup and view all the answers

    Which of the following statements about direct dimensioning is correct?

    <p>It involves placing a dimension between two key points.</p> Signup and view all the answers

    Which dimensioning method assigns tolerances based on statistical practices?

    <p>Statistical tolerancing</p> Signup and view all the answers

    What is the purpose of a datum reference frame in GD&T?

    <p>To establish a coordinate system for measurement</p> Signup and view all the answers

    For a fitting characterized by a 'Running or sliding clearance fit (RC)', what is the expected performance?

    <p>Fits providing consistent running performance with lubrication</p> Signup and view all the answers

    What is the main focus when determining a 'Locational interference fit (LN)'?

    <p>Primarily ensuring accuracy of location with minimum alignment requirements</p> Signup and view all the answers

    What is the standard practice for representing dimensions in metric systems?

    <p>Using a single zero with no indication of tolerance</p> Signup and view all the answers

    What establishes the tertiary datum plane in a tolerance framework?

    <p>A one-point contact with the right-hand surface</p> Signup and view all the answers

    What does Maximum Material Condition (MMC) refer to?

    <p>The condition where a feature of size contains maximum material within stated limits</p> Signup and view all the answers

    Which statement about profile tolerance is true when datums are specified?

    <p>It controls shape, size, and location of the contour</p> Signup and view all the answers

    What is a significant problem related to angularity in geometric tolerancing?

    <p>The wedge-shaped zone allows for uneven tolerances</p> Signup and view all the answers

    How does circular runout differ from circularity or roundness tolerances?

    <p>It controls a surface relative to a datum axis</p> Signup and view all the answers

    What impact do excessively small tolerances have on manufacturing processes?

    <p>They complicate manufacturing and increase expenses</p> Signup and view all the answers

    What potential issue arises from applying tolerances that are too loose?

    <p>It may lead to improper functioning of parts</p> Signup and view all the answers

    Is it mandatory for every feature control frame to include a reference datum?

    <p>No, flatness tolerances do not require a reference datum</p> Signup and view all the answers

    What does concentricity specify in geometric tolerancing?

    <p>It controls the axis-to-axis relationship between two features</p> Signup and view all the answers

    What is a characteristic of the tolerance zone specified by perpendicularity?

    <p>It includes zones between defined parallel planes</p> Signup and view all the answers

    What is a characteristic of basic dimensions in technical drawings?

    <p>They define the exact location of features from established datums.</p> Signup and view all the answers

    When dimensioning a visible gap, what is the minimum distance required between extension lines and object geometry?

    <p>1 mm</p> Signup and view all the answers

    Which statement about the dimensioning of holes is accurate?

    <p>Giving dimensions between holes is generally more beneficial for clarity.</p> Signup and view all the answers

    What does the term 'free state condition' refer to in relation to dimensions and tolerances?

    <p>It signifies that dimensions are effective when parts are unrestrained.</p> Signup and view all the answers

    Which of the following correctly describes the representation of a counterbore in technical drawing?

    <p>| symbol describes the counterbore.</p> Signup and view all the answers

    Which statement about tolerance accumulation in chain dimensioning is accurate?

    <p>It typically results in the largest accumulation of tolerances.</p> Signup and view all the answers

    In profile tolerances, what is the effect of specifying datums?

    <p>It governs the size, shape, and position of the contour.</p> Signup and view all the answers

    How does corridor dimensioning differ from baseline dimensioning?

    <p>It allows dimensions to originate from any point, not a common datum.</p> Signup and view all the answers

    What is the primary purpose of using statistical process controls in manufacturing?

    <p>To inform adjustments in tolerance values for cost efficiency.</p> Signup and view all the answers

    Which fit does NOT generally allow for precise alignment but provides a degree of freedom in movement and location?

    <p>Loose running fit</p> Signup and view all the answers

    Study Notes

    Dimensioning and Tolerancing

    • Dimensioning Systems: Drawings conform to the SI or U.S. Customary system.
    • Metric Dimensions (mm): Less than 1mm: Zero before decimal. Whole mm: No decimal or zero. Exceeds whole mm by .1mm: Last digit only. No commas or spaces to separate digits when specifying mm.
    • Inch Dimensions: Zero is not used before decimal for values less than 1 inch.
    • Dimension Placement: Dimension lines are at least 10mm from any view to avoid clutter, and 6mm between dimension lines, and 1mm distance between extension lines and object geometry. Extension lines should extend 2-3mm past dimension line.
    • Hole Dimensioning: Dimension between holes, not from edge of part.
    • Chain Dimensioning: Features are dimensioned relative to one another. Used for features needing interrelation.
    • Baseline Dimensioning: Dimensions originate from a base or datum (used for CNC machines). Eliminates tolerance accumulation.
    • Dimension Views: Dimensions should appear only once, in the view where the feature is clearest. Dimension only to visible or solid lines.
    • Dimensioning Specific Features:
    • Circles: Dimensioned as diameters.
    • Arcs: Dimensioned as radii.
    • Chamfers: Dimensioned by specifying length and angle or two distances.
    • Depth: Represented by a downward-pointing arrow.
    • General Dimensions: Dimensions apply in the free state (unless otherwise specified), for full depth, length, and width of the feature at room temperature and pressure.
    • Typical Dimensions: "TYP" or "TYPICAL OF" indicates repeated features.
    • Hole and Cylindrical Features Views: Holes should be dimensioned as circles, and cylindrical features as rectangles in respective views.

    Tolerances

    • Tolerance: Total permissible variation in size or location dimension.
    • Bilateral Tolerances: Deviation evenly or unevenly distributed above and below the basic size.
    • Unilateral Tolerances: All deviation in one direction from basic size.
    • Limit Dimensions: High limit above low limit.
    • Direct Dimensioning: Yields smallest tolerance accumulation.
    • Statistical Tolerancing: Allows tolerance values based on statistical practices, but can be more restrictive than needed.
    • Form Tolerances: For individual features, not related to datums. Includes straightness, flatness, circularity, and cylindricity.
    • Profile Tolerance: 2D or 3D tolerance zone defined by contours.
    • Orientation Tolerances: Parallelism, Perpendicularity, Angularity.
    • Location Tolerances: Position, Symmetry.
    • Geometric Tolerances: Requires Datum reference frame, and tolerances that describe 2D/3D tolerance zones.
    • Fits: Clearance, Interference, Transition.
    • Selective Assembly: Matching parts accurately.
    • Allowance: The difference between the maximum material limits of mating parts.
    • Basic Size: Size from which limit dimensions are derived.
    • Hole basis/Shaft basis: Defines the basic size, which is applied to the hole lower limit, or the shaft upper limit, respectively.
    • English and Metric Fits: Include various types like RC, LC, LT, LN, FN, running or sliding clearance fit (RC), locational clearance fits (LC), etc.
    • Maximum Material Condition (MMC): Feature of size contains maximum amount of material.
    • Minimium Material Condition (LMC): Opposite of MMC.
    • Datum Reference Frame: Used for proper geometric tolerance application. Errors in GD&T may relate to datum setup.

    Drawing Conventions

    • Feature Control Frame: Contains geometric tolerance and relative datums.
    • Datum Planes: Primary, secondary, and tertiary planes must be set per drawing.
    • Inspection Methods: Optical comparators with overlay charts, mechanical gaging using master parts and dial indicators.

    Additional Notes

    • Geometric Tolerances: Must be applied to every individual dimension.
    • Clearance, Interference, Transition Fits: The specified limits result in clearance, interference, or either in the assembled parts.
    • Dimensions and tolerances: Apply in the drawing level where they are specified; they are assumed to be at room temperature and pressure unless otherwise stated.
    • Dimensioning and Tolerancing: The process of dimensioning and tolerancing shall be complete, which ensures full understanding of the characteristics of each feature.
    • Dimensional units: Should be in the appropriate systems (mm or inches).

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    Description

    Test your understanding of dimensioning systems, including metric and inch dimensions, their placement, and methods such as chain and baseline dimensioning. This quiz will cover essential guidelines for accurately dimensioning drawings in engineering and design.

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