Chapter 5: Convention Practice in Orthographic Writing
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Questions and Answers

What type of view represents only half of a part?

  • Aligned view
  • Partial view
  • Local view
  • Half view (correct)

    • Local view shows the entire object without any omissions.

    False

    What is the purpose of using a principal view?

    To better describe an object and facilitate dimensioning.

    The center line in a half view acts as a line of __________.

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

    Match the types of views with their definitions:

    <p>Partial view = Represents portions of the part that require clarification Half view = Illustrates only half of the part Local view = Shows only necessary features for clarity Aligned view = Drawn by rotating the object’s features about the symmetry axis</p> Signup and view all the answers

    Why is it advisable to show symmetrical features on adjacent views?

    <p>To maintain true size and radial distance</p> Signup and view all the answers

    A break line is required when making a half view.

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

    An __________ view is drawn by rotating the object's features about a symmetry axis.

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

    What is the primary purpose of using conventions in orthographic writing?

    <p>To enhance the clarity of a drawing</p> Signup and view all the answers

    Incompleted side views include features that are clearly seen from the selected viewing direction.

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

    Name one type of convention practice in orthographic writing.

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

    The practice of using a dash line to represent a hidden edge in a drawing is known as _____ convention.

    <p>hidden edge</p> Signup and view all the answers

    Match the following types of convention practices with their descriptions:

    <p>Alternate position of side view = Placing side view beside the top view to save space Incompleted view = Eliminating features not clearly seen from a view Aligned view = Arranging views in alignment Enlarged view = Making certain features larger for clarity</p> Signup and view all the answers

    Which type of convention practice improves clarity by eliminating features that obstruct the view?

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

    Using conventions in orthographic drawing can reduce the drafting effort.

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

    What type of view is used to represent a feature that can be difficult to read in orthographic projection?

    <p>Incompleted side view</p> Signup and view all the answers

    What does an aligned view of holes imply?

    <p>That holes are at unsymmetrical positions</p> Signup and view all the answers

    An enlarged view must not specify the name and scale used.

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

    What is the definition of an enlarged view?

    <p>A view drawn with a larger scale, selected from the full view.</p> Signup and view all the answers

    A non-existing line of intersection is represented when surfaces are eliminated by __________.

    <p>fillets and rounds</p> Signup and view all the answers

    Match the following terms with their definitions:

    <p>Aligned view of holes = Holes depicted at symmetrical positions Enlarged view = View drawn at a larger scale Non-existing line of intersection = Line eliminated by fillets Conventional practice = Standard method in orthographic projection</p> Signup and view all the answers

    What is the significance of using a continuous thin line in enlarged views?

    <p>To frame the selected portion</p> Signup and view all the answers

    True projections always represent the object accurately without needing additional lines.

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

    When is it necessary to show additional lines in projections?

    <p>When true projection misleads the representation of an object.</p> Signup and view all the answers

    What information is NOT typically included in the dimensioning process?

    <p>Aesthetic design choices</p> Signup and view all the answers

    Dimension lines should be placed very closely together for clarity.

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

    Name one system used in dimensioning.

    <p>Metric system or Decimal-inch system or Fractional-inch system</p> Signup and view all the answers

    The primary purpose of dimensioning is to specify a part's information using figures, symbols, and __________.

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

    Match the dimensioning components with their descriptions:

    <p>Extension lines = Indicate the location of features that are dimensioned Dimension lines = Indicate direction and extent of a dimension Leader lines = Indicate details of a feature with a local note Dimension figures = Represent the numerical value of a dimension</p> Signup and view all the answers

    Which dimensioning system uses examples like 32, 32.5, and 32.55?

    <p>Metric system</p> Signup and view all the answers

    Local notes must be written in 4H pencil.

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

    What is the minimum space that should be left between dimension lines?

    <p>At least 2 times the letter height</p> Signup and view all the answers

    What unit is used for length dimension according to JIS and ISO standards?

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

    The angular dimension in JIS and ISO standards is represented in radians.

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

    What two methods are used to place dimension figures in a drawing?

    <p>Aligned method and Unidirectional method</p> Signup and view all the answers

    According to drafting standards, dimension notes should be placed __________ to the feature they apply to.

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

    Which of the following statements is a common mistake in dimensioning?

    <p>Using both aligned and unidirectional methods on the same drawing</p> Signup and view all the answers

    Match the dimensioning methods with their descriptions:

    <p>Aligned method = Readable from bottom and right side Unidirectional method = Readable from the bottom only</p> Signup and view all the answers

    Dimensioning is only concerned with the size of an object, not its location.

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

    What is the purpose of dimensioning in drafting?

    <p>To add size and location information necessary to manufacture the object.</p> Signup and view all the answers

    What dimension should be indicated for a cylinder in a longitudinal view?

    <p>Diameter and length</p> Signup and view all the answers

    Holes should be dimensioned using location dimensions from their center lines.

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

    What symbol is used before the diameter size when indicating the dimensions of holes?

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

    The angle notation for a 45-degree chamfer is represented as __________.

    <p>S 45o</p> Signup and view all the answers

    What does the letter 'S' denote in the context of size dimensions?

    <p>Size dimension</p> Signup and view all the answers

    Match the following types of holes with their descriptions:

    <p>Through thickness hole = Extends completely through the material Blind hole = Does not go all the way through Small size hole = Requires leader line and local note for dimensions Large size hole = Uses diametral dimension line for measurements</p> Signup and view all the answers

    The radius of an arc is always labeled with the letter 'R'.

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

    What angle range should a leader line forming a radial dimension make with the horizontal?

    <p>30 to 60 degrees</p> Signup and view all the answers

    Which of the following practices is recommended to avoid confusion in dimensioning?

    <p>Draw extension lines from the nearest points to be dimensioned</p> Signup and view all the answers

    To dimension an angle, use a circular dimension line having the center at the __________ of the angle.

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

    It is advised to dimension hidden lines in technical drawings.

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

    What is the common mistake often made in indicating dimensions for holes?

    <p>Using incorrect symbols or measurements</p> Signup and view all the answers

    Match the dimensioning terms with their definitions:

    <p>Diameter = Measurement across a circle through the center Radius = Distance from the center to the edge of a circle Fillet = A rounding of a corner or edge of a part Arc = A segment of a circle</p> Signup and view all the answers

    When all fillets and rounds are uniform in size, what should be added to the drawing?

    <p>Specify 'All fillets and rounds are Rxx'</p> Signup and view all the answers

    It is acceptable to place the dimension figure and arrowhead outside the arc if there is insufficient space.

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

    What should be done if the center of an arc's dimension locates outside the drawing sheet?

    <p>Use a foreshortened radial dimension line.</p> Signup and view all the answers

    Study Notes

    Chapter 5: Convention Practice in Orthographic Writing

    • Orthographic writing conventions are commonly accepted practices. These practices disregard some strict rules of orthographic projection.
    • Conventions make multiview representations more readable and reduce drafting effort. This improves drawing clarity and makes dimensioning easier.
    • Conventions are used to save or efficiently use drawing space.

    Topics

    • Definition: Conventions are commonly accepted practices that simplify orthographic projection. They disregard strict projection rules to improve readability, save drafting time, and improve space usage when drawing objects.
    • Purpose: To improve drawing clarity, ease dimensioning, reduce drafting effort and save drawing space.
    • Types of Conventions:
      • Alternate position of side view
      • Incompleted view
        • Incomplete side view
        • Partial view
        • Half view
        • Local view
      • Aligned view
      • Enlarged view
      • Non-existing intersection line
      • Cylinder intersection

    Definition

    • Convention is a commonly accepted practice in orthographic projection. It disregards some of the precise rules of orthographic projection. This is done to achieve a multiview representation that is more easily and quickly read and understood, saving space and effort.

    Example: Already met convention practice

    • Using a dash line to represent hidden edges— a standard convention often presented in engineering drawings to clearly convey hidden features.

    Purposes

    • Improve drawing clarity: Presenting all information efficiently while maintaining clarity and reducing complexities.
    • Facilitate dimensioning: Presenting measurable information in an understandable format for dimensioning.
    • Reduce drafting effort: Decreasing the amount of work required to create accurate drawings.
    • Save or efficiently use drawing space: Using space efficiently to streamline drawing representation.

    Types of Convention Practice (continued)

    • Aligned view
    • Enlarged view
    • Non-existing intersection line
    • Intersection (e.g., hole on a cylinder) for various cylindrical features

    Alternate Position of Side View

    • Purpose: To save drawing space. To improve clarity.
    • Conventional practice: When an object's height is small and the depth is relatively large, place the side view beside the top view to enhance clarity and reduce complexity.

    Incomplete Side View

    • Definition: Incomplete side views eliminate features that wouldn't clearly show in a given viewing direction, simplifying the drawing without losing essential information.

    Partial View

    • Definition: A view showing parts of a part that need clarification to show details in a particular viewing direction.

    Half View

    • Definition: A partial view illustrating only half the part. The center line acts as a line of symmetry, signifying the mirroring of the other half.

    Local View

    • Definition: A view showing only features needing clarification to portray critical details of a particular section of an object. This makes it easier to see and understand parts of the object that need detailed representation.

    Aligned View

    • Definition: A view drawn by imagining rotating an object's features to appear in a principle view about a symmetry axis, making the drawing more readable without losing perspective.

    Enlarged View

    • Definition: A view of a selected portion of a full view. It is drawn at a larger scale to reveal fine details, making them easy to understand and measure.

    Non-existing Line of Intersection

    • Definition: The line of intersecting surfaces that are eliminated by fillets and rounds, as a simplification to streamline drawing presentation.
    • Conventional practice: Show additional lines projected from the theoretical intersection of the surfaces as if the fillets and rounds were not present, to account for the misleading representation if the fillets and rounds are not shown.

    Intersection Between Fillet and Round

    • Definition: This describes how parts with round or curved edges meet. The drawing shows various ways to portray these intersections, with common "runout" or connecting portions forming the intersection. A convention may be used to indicate or to provide a clearer view of the connection while respecting orthographic principles.

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    Related Documents

    Chapter 5 Convention Practice in Orthographic Writing PDF
    Chapter 6 Dimensioning PDF

    Description

    This quiz focuses on the conventions of orthographic writing as discussed in Chapter 5. It covers the definition, purpose, and various types of conventions that simplify multiview representations and improve spatial efficiency. Test your understanding of how these practices enhance readability and dimensioning in technical drawing.

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