Chapter 5: Convention Practice in Orthographic Writing
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Questions and Answers

Which type of view shows only features that need clarification?

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

A half view includes the entire object without any breaks.

False (B)

What is the purpose of using a principal view?

To better describe an object and facilitate dimensioning.

An __________________ is created by rotating the object's features about a symmetry axis.

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

Match the following views with their descriptions:

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

What should be avoided when representing a half view?

<p>Adding a symmetry symbol (A)</p> Signup and view all the answers

A center line in half view acts as a line of symmetry.

<p>True (A)</p> Signup and view all the answers

Why is it advisable to show symmetric features in true size at true distances?

<p>To ensure clarity and accuracy in representation.</p> Signup and view all the answers

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

<p>To improve clarity and facilitate dimensioning (A)</p> Signup and view all the answers

Incompleted views include features that can be clearly seen from a specific viewing direction.

<p>False (B)</p> Signup and view all the answers

Name two types of convention practices mentioned.

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

The ______ view refers to a side view that has omitted features not visible from the chosen perspective.

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

Match the following types of convention practices with their definitions:

<p>Alternate position of side view = To save drawing space and improve clarity Incompleted view = Elimination of features not clearly visible Aligned view = Consistent alignment of views Enlarged view = Detailed representation of a specific section</p> Signup and view all the answers

Which of the following is NOT a type of convention practice?

<p>Scale view (B)</p> Signup and view all the answers

Using a dash line to represent a hidden edge is an example of convention practice.

<p>True (A)</p> Signup and view all the answers

What advantage does placing the side view beside the top view provide?

<p>It saves drawing space and improves clarity.</p> Signup and view all the answers

What is the purpose of an enlarged view in technical drawings?

<p>To provide a more detailed view of a specific area (D)</p> Signup and view all the answers

The non-existing line of intersection is visible in object drawings with rounds and fillets.

<p>False (B)</p> Signup and view all the answers

What must be specified for an enlarged view?

<p>Name and scale</p> Signup and view all the answers

A __________ view is drawn at a larger scale and focuses on a selected portion of the full view.

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

Match the following terms with their definitions:

<p>Align view of holes = Gives the impression that holes are at unsymmetrical position Enlarged view = A view partly selected from full view and drawn with a larger scale Non-existing line of intersection = The line that is eliminated by fillets and rounds Conventional practice = Standard methods used for representation in drawings</p> Signup and view all the answers

When would you show additional lines projected from actual intersections?

<p>When true projection misleads the representation (C)</p> Signup and view all the answers

Aligned convention applies solely to the representation of ribs.

<p>False (B)</p> Signup and view all the answers

What impression does the aligned convention give when applied to views of holes?

<p>It gives the impression that there is a hole at the center of the plate.</p> Signup and view all the answers

Flashcards

Partial View

A view showing only essential portions of an object to clarify specific features.

Half View

A partial view showing half of the object, often using a center line as a line of symmetry.

Local View

A view focusing on a specific feature or detail of the object, often to provide a clearer representation.

Aligned View

Rotating features of an object to align them with a symmetry axis, creating a clearer view for dimensioning.

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Why use Aligned View?

Aligned views are used to avoid confusion and wasted time when representing features that are projected in a conventional way.

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Convention Practice

The practice of showing symmetrical features in adjacent views, ensuring true size and distance from the symmetry axis.

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Symmetry Symbol

A symbol used to indicate a line of symmetry, typically a thin line with a symbol.

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Break Line

A thin line used to indicate a break in an object, common in half views.

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Enlarged view

A view that shows a selected portion of an object at a larger scale.

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Non-existing line of intersection

A line that represents the intersection of surfaces, even if those surfaces have fillets or rounds that would normally hide the intersection.

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Orthographic Projection

A method of representing a 3D object using multiple 2D views, where each view shows the object from a different angle.

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Apply convention

Following a set of rules to create a consistent and understandable representation of an object.

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Align view of holes

Positioning the view of an object so that holes appear aligned and symmetrical.

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Align view of ribs

Positioning the view of an object so that ribs (raised areas) appear aligned.

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Align view of ribs & holes

Positioning the view to align both ribs and holes.

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Align view of ribs & holes & keyway

Positioning the view to align ribs, holes, and keyways (grooves for a key).

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Orthographic Convention

A commonly accepted practice in orthographic projection that simplifies or clarifies drawings by deviating from strict rules.

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Purpose of Conventions

Conventions in orthographic projection aim to enhance clarity, facilitate dimensioning, reduce drafting effort, and optimize drawing space.

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Alternate Side View Convention

This convention places the side view beside the top view when an object's height is small and its depth is large. This saves space and improves clarity.

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What is an Incompleted View?

An incomplete side view removes features that are obscured or unclear from a particular viewing direction.

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Aligned View Convention

This convention aligns multiple views to create a more efficient and readable arrangement.

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Enlarged View Convention

This convention amplifies a specific area of the object to showcase details that wouldn't be visible at normal scale.

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Non-Existing Intersection Line

This convention omits intersection lines when they are not essential to understanding the object's shape.

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Cylinder Intersection

This convention simplifies the representation of a hole in a cylinder by showing only the hole's outline rather than complete intersections.

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Study Notes

Chapter 5: Convention Practice in Orthographic Writing

  • Orthographic writing conventions are commonly accepted practices that sometimes disregard strict rules of orthographic projection.
  • These conventions improve drawing clarity, ease dimensioning, reduce drafting effort, and save or efficiently use drawing space.

Topics

  • Definition

    • Conventions are commonly accepted practices that sometimes ignore certain orthographic projection rules, with the aim of creating more readable and practical technical drawings.

  • Purposes

    • Improve drawing clarity.
    • Facilitate dimensioning.
    • Reduce drafting effort.
    • Save or efficiently use drawing space.

  • Types of Conventions

    • Alternate position of side view

      • Used when an object's height is smaller compared to its depth, placing the side view next to the top view to save space and enhance clarity.

    • Incomplete view

      • Eliminates features not clearly visible from a chosen viewpoint, simplifying the representation.
      • Includes sub-types such as incomplete side view, partial view, half view and local view.

    • Aligned view

      • Features are rotated in a principle view and shown aligned along a symmetry axis or centre line.
      • Used to make drawing of symmetrical features more efficient.

    • Enlarged view

      • A selective view from a full view drawing with a larger scale.
      • In full view, the selected portion has a label and a border using continuous thin lining.
      • Enlarged view requires the specified name and scale.

    • Non-existing intersection line

      • Avoids potentially confusing representations of intersections occurring due to fillets and rounds, by showing projected lines as if fillets or rounding were not present.

    • Cylinder intersection

      • Illustrates how conventions are used to represent intersections involving cylinders.

Examples

  • An example shows using a dash line to represent hidden edges.
  • Examples of alternate positioning of views are given to illustrate how the top and side views are oriented.
  • Examples show incomplete views
  • Examples of partial views, half views and local views are showcased.
  • Examples illustrate the application of aligned views of holes and ribs.
  • Enlarging and showing the application of enlarged views.
  • Examples demonstrate how non-existing intersection lines are used when fillets and rounds are present.
  • Examples of intersections between a fillet and a round are shown.
  • Examples of intersections between a round and a plane surface are presented.
  • Examples illustrate the difference in drawing a large hole versus a small hole in a cylinder.

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Chapter 5 Convention Practice in Orthographic Writing PDF

Description

This quiz covers Chapter 5, focused on convention practices in orthographic writing. You'll explore definitions, purposes, and types of conventions designed to enhance the clarity and efficiency of technical drawings. Understand how ignoring strict rules can improve readability and reduce drafting effort.

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