Chapter 5: Convention Practice in Orthographic Writing
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Questions and Answers

What is one of the purposes of using convention practices in orthographic writing?

  • To complicate dimensioning
  • To improve the clarity of a drawing (correct)
  • To adhere strictly to projection rules
  • To increase the drafting effort

    • Conventions in orthographic writing require strict adherence to all rules of projection.

    False

    Name one type of convention practice that aims to save drawing space.

    Alternate position of side view

    The practice of representing a hidden edge with a _______ line is an example of a convention.

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

    Match the types of convention practice with their definitions:

    <p>Incompleted view = Eliminates features not clearly seen Aligned view = Arranges views in alignment Enlarged view = Increases the size of a particular view Non-existing intersection line = Disregards certain intersection lines</p> Signup and view all the answers

    Which type of convention practice involves views placed beside the top view?

    <p>Alternate position of side view</p> Signup and view all the answers

    An incomplete side view shows all features without omission.

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

    What is the main goal of using conventions in drawings?

    <p>To increase clarity and reduce drafting effort</p> Signup and view all the answers

    What is a partial view?

    <p>A view that represents portions of the part that need clarification</p> Signup and view all the answers

    A local view shows all the features of a part in a clear manner.

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

    What does the symmetry symbol indicate in a half view?

    <p>It indicates the line of symmetry.</p> Signup and view all the answers

    In a half view, the center line acts as a line of __________.

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

    Which of the following best describes an aligned view?

    <p>A view created by rotating the object’s features about a symmetry axis.</p> Signup and view all the answers

    Match the following views with their descriptions:

    <p>Partial View = Shows portions needing clarification Half View = Illustrates half of a part Local View = Highlights specific features only Aligned View = Drawn by rotating features about an axis</p> Signup and view all the answers

    A half view can include a break line.

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

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

    <p>It allows for clear representation at true size and distance from the symmetry axis.</p> Signup and view all the answers

    What does applying an aligned convention to view holes give the impression of?

    <p>Holes at unsymmetrical positions</p> Signup and view all the answers

    An enlarged view must specify both the name and the scale used.

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

    What is the definition of an enlarged view?

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

    The __________ line of intersection is eliminated by fillets and rounds.

    <p>non-existing</p> Signup and view all the answers

    Match the following concepts with their definitions:

    <p>Aligned convention = Gives perspective view of holes' positions Enlarged view = Framed view at larger scale Non-existing line of intersection = Lines of intersecting surfaces eliminated by rounds Orthographic projection = 2D view representation of a 3D object</p> Signup and view all the answers

    Which of the following is true regarding the non-existing line of intersection?

    <p>It can be represented when necessary</p> Signup and view all the answers

    What is the purpose of using an aligned convention in technical drawings?

    <p>To accurately represent positional relationships of holes, ribs, and other features.</p> Signup and view all the answers

    A part is drawn with a scale of ______ when using the enlarged view.

    <p>3:1</p> Signup and view all the answers

    What type of dimensioning system uses the format 0.25 and 5.375?

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

    Extension lines indicate the direction and extent of a dimension.

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

    What are two types of information that dimensioning specifies?

    <p>Sizes and locations of features, Material’s type.</p> Signup and view all the answers

    Dimension lines should not be spaced too close to each other and to the view. The recommended space is at least ______ times the height of a letter.

    <p>2</p> Signup and view all the answers

    Which of the following components is drawn with a 4H pencil?

    <p>Dimension lines</p> Signup and view all the answers

    What is the unit of length dimension according to JIS and ISO standards?

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

    Match the following dimensioning components with their descriptions:

    <p>Extension lines = Indicate the location on the object’s features Dimension lines = Indicate the direction and extent of a dimension Leader lines = Indicate details of the feature with a local note Dimension figures = Represent numerical values of dimensions</p> Signup and view all the answers

    The aligned method allows dimension figures to be read from all sides of the drawing.

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

    What is the purpose of a leader line in dimensioning?

    <p>To indicate details of the feature with a local note.</p> Signup and view all the answers

    What symbol is used to denote angular dimensions?

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

    The fractional-inch system can represent dimensions like 1/4 and 5/8.

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

    Dimensioning involves adding size and location information necessary to __________ the object.

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

    Match the dimensioning methods with their characteristics:

    <p>Aligned Method = Readable from bottom and right side Unidirectional Method = Readable only from bottom Angular Dimension = Uses the symbol 'o' for degrees Dimensions in millimeters = Follow JIS and ISO standards</p> Signup and view all the answers

    Which dimensioning method places figures so they are only readable from the bottom?

    <p>Unidirectional Method</p> Signup and view all the answers

    Local notes should be placed outside the view they apply to.

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

    What symbol is used to represent diameter in a longitudinal view of a cylinder?

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

    What is a common mistake in dimensioning practices indicated in the content?

    <p>Placing dimensions too far from the feature.</p> Signup and view all the answers

    The diameter of a hole should be indicated in the same view as the hole's depth.

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

    What is the correct way to dimension a blind hole?

    <p>Use leader line and note specifying diameter and depth.</p> Signup and view all the answers

    The angle of a chamfer should be indicated as S ______.

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

    Match the following types of holes with their characteristics:

    <p>Thru Hole = Passes completely through the material Blind Hole = Does not pass completely through the material Countersink = Creates a conical relief at the mouth of a hole Counterbore = Creates a flat recess around the hole</p> Signup and view all the answers

    Which of the following practices is recommended for drawing extension lines?

    <p>Drawing from the nearest points</p> Signup and view all the answers

    It is acceptable to dimension hidden lines in technical drawings.

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

    What common mistake should be avoided when indicating holes?

    <p>Using object lines as extension lines.</p> Signup and view all the answers

    What is the proper way to dimension an arc?

    <p>By giving the radius with an 'R' notation</p> Signup and view all the answers

    The leader line for dimensioning an arc must always be horizontal.

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

    What should you indicate when all fillets and rounds share the same radius?

    <p>Add a note stating 'All fillets and rounds are Rxx' where 'xx' is the radius.</p> Signup and view all the answers

    To manufacture a part, it is necessary to know its width, depth, thickness, and the diameter of the ______.

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

    Match the following dimensions with their definitions:

    <p>Size dimension = Refers to the actual measurable dimensions of a part Location dimension = Indicates the position of a feature relative to a reference point Radial dimension = Used to specify the radius of an arc Diameter dimension = The measurement across a circle, through its center</p> Signup and view all the answers

    What is the acceptable angle range for a leader line when dimensioning an arc?

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

    How should dimension figures for arcs be placed in relation to the arc?

    <p>Dimension figures and arrowheads should be placed inside the arc.</p> Signup and view all the answers

    All dimensions for arcs must be positioned outside the arc to avoid clutter.

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

    Study Notes

    Chapter 5: Convention Practice in Orthographic Writing

    • Orthographic writing conventions are commonly accepted practices that simplify drawings while maintaining accuracy
    • These practices disregard certain strict rules of orthographic projection to improve readability and reduce drafting time.

    Topics

    • Definition: Conventions are commonly accepted practices that relax certain strict rules of orthographic projection.
    • Purposes of Conventions:
      • Enhance drawing clarity.
      • Facilitate dimensioning.
      • Streamline drafting effort.
      • Optimize use of drawing space.
    • Types of Conventions:
      • Alternate position of side view: Used when an object's height is small compared to its depth, positioning the side view next to the top view. This saves space and improves clarity.
      • Incomplete view: Eliminates unnecessary detail from side views when a feature's visibility is limited from a particular perspective. This can be achieved via:
        • Incomplete side view: Eliminating sections of a side view if a portion of the object is obscured or irrelevant.
        • Partial view: Showing only selected portions of a part, to clarify features, using a limited portion of the view.
        • Half view: Showing only one-half of a component if the other half is a mirror image. It often uses a center line as a symmetry axis.
        • Local view: Presenting only the necessary details from a specific area of the part when larger sections of the design are irrelevant to the feature in focus.
      • Aligned view: Imaginary rotation of object features in a principle view around a symmetry axis. This is particularly helpful when showcasing symmetrical details.
      • Enlarged view: A portion of a full view is enlarged for clarity of smaller details, and always specified with name and scale. Example of providing the scale, for enlargement, such as (3:1) next to a reference position.
      • Non-existing intersection line: Depicts the intersection of surfaces that are eliminated by filleting or rounding, but are still considered part of the shape.
      • Intersection: Shows the joining point of two surfaces. Example of intersection is a hole in a cylinder.
        • Large hole in a cylinder: Requires a true projection of the hole.
        • Small hole in a cylinder: Conventionally represented differently from a large hole.

    Examples

    • Already met convention practice: Use a dashed line in the front view to represent a hidden edge.
    • Alternate position of side view example: When the height of the object is small compared to its depth, the side view is drawn alongside the top view.
    • Incomplete side views (example): Side views are presented with portions removed, for improved clarity and reduced visual complexity.
    • Partial view (example): Only a portion of the shape is illustrated in the view to focus on precise sections.
    • Half view (example): A symmetrical design is shown using a center line (or symmetry line) to represent only half of the design because the other half is an exact counterpart, but no continuous line.
    • Local view (example): A magnified perspective of a specific section.
    • Align view (example): Symmetrical features are accurately illustrated at a true radial distance from the symmetry axis. Example using holes and ribs.
    • Enlarged view (example): A specified portion of the full view is increased in scale for improved detail clarity and is identified with a scale, example A (3:1).
    • Non-existing line of intersection (example): A hidden line within a part is illustrated even though those sections are cut away (e.g. rounding, filleting). Example of a curved edge, fillet, and round, using the runout term for the curved edge displayed.
    • Intersection between fillet and round (example): How to display a rounded surface/curved edges instead of a sharp intersection - displaying the runout.
    • Intersection between round plane surface (example): The intersection of a round surface and a flat surface. (Example drawings of how to represent a rounded surface intersecting with a plane)
    • Hole in cylinder (example): The difference in drawing a large hole and a small hole in a cylinder, showing that an large hole requires a true projection, whereas a small one is conventionally different.

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    Related Documents

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

    Description

    Explore the key conventions in orthographic writing that enhance clarity and efficiency in drafting. This quiz covers the definition, purposes, and various types of conventions, including alternate position views and incomplete views. Improve your understanding of how these practices can simplify drawings while maintaining accuracy.

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