Orthographic Projection and Multiview Drawing
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Orthographic Projection and Multiview Drawing

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Questions and Answers

Which of the following shapes has no edges?

  • Cube
  • Sphere (correct)
  • Prism
  • Cylinder

    • A surface can be both plane and curved.

    True

    What is the primary purpose of using a hidden line in multiview drawings?

    To show the existence of a hidden edge.

    A surface is bounded by edges or a surface limit, which can be classified as ________ or ________.

    <p>plane, curve</p> Signup and view all the answers

    Match the following terms with their descriptions:

    <p>Prism = A solid with two parallel faces Cylinder = A solid with a curved surface and two flat circular ends Sphere = A round shape with no edges or faces Edge = The line where two surfaces meet</p> Signup and view all the answers

    What is the purpose of orthographic projection?

    <p>To graphically represent a 3-D object on 2-D media</p> Signup and view all the answers

    Parallel projection lines can only be normal to the plane of projection.

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

    What is meant by 'line of sight' in projection theory?

    <p>An imaginary ray of light between an observer's eye and an object.</p> Signup and view all the answers

    In orthographic projections, the image created on the projection plane depends on the object's _____ to the plane.

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

    Match the following types of view with their advantages:

    <p>Multiview drawing = Accurately presents object’s details such as size and shape Pictorial drawing = Easy to visualize</p> Signup and view all the answers

    Which of the following statements about projections is correct?

    <p>Multiview drawings require training to visualize.</p> Signup and view all the answers

    Axonometric drawing is a type of multiview drawing.

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

    Name one advantage of using multiview drawings.

    <p>Accurately presents object’s details such as size and shape.</p> Signup and view all the answers

    What is the primary outcome of shape and angle distortion in perspective drawing?

    <p>Circular holes appear as ellipses</p> Signup and view all the answers

    Multiview drawing requires viewing an object from different angles.

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

    What dimensions are necessary to describe an object in multiview drawing?

    <p>Width, Depth, Height</p> Signup and view all the answers

    In drawing, a ______ is defined as a line that represents the boundary between two faces of an object.

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

    Which method is NOT used in multiview drawing?

    <p>Use a single circular view</p> Signup and view all the answers

    Match the following views to their corresponding descriptions:

    <p>Top view = View from above Front view = View from the front Right side view = View from the right Rear view = View from the back</p> Signup and view all the answers

    In perspective drawing, sizes and shapes appear distorted.

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

    What is the purpose of the 'glass box' concept in drawing?

    <p>It helps visualize the revolution of planes of projection.</p> Signup and view all the answers

    What concept is used to understand the projection of inclined lines and planes?

    <p>Glass box concept</p> Signup and view all the answers

    An oblique line projection is the same as a normal line projection.

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

    What is the function of a miter line in projection drawings?

    <p>To assist in accurately transferring depth between views.</p> Signup and view all the answers

    Curved surfaces can either tangent or ______ with an adjacent plane or curve surface.

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

    Match the following types of projections with their descriptions:

    <p>Inclined line = Projected at an angle to the reference planes Oblique line = Projected in a manner that distorts depth Curved surface = Surface with a continuous bend Plane = Flat, two-dimensional surface without depth</p> Signup and view all the answers

    How do you transfer depth in projection drawings?

    <p>Through direct measurement</p> Signup and view all the answers

    In multiview drawings, it is preferable to have no space between front and side views.

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

    What is a key characteristic of a curve line projection?

    <p>It maintains a continuous bend across views.</p> Signup and view all the answers

    What should a hidden line do when it joins a visible line?

    <p>Join the visible line and extend into space</p> Signup and view all the answers

    A curve hidden line can start on a center line.

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

    What are the four corner formations that can be created at the intersection of hidden lines?

    <p>L, T, V, Y</p> Signup and view all the answers

    A center line should always start and end with a _____ dash.

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

    Match each term to its definition:

    <p>Visible Line = Represented as a solid line Hidden Line = Indicates features that are not directly visible Center Line = Shows symmetry or center axis Curve Hidden Line = Starts from a center line and depicts hidden features</p> Signup and view all the answers

    How should a center line be presented when depicting a small hole?

    <p>Thin continuous line</p> Signup and view all the answers

    A center line can extend between views.

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

    When a center line forms a continuation with a visible or hidden line, a _____ should be left.

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

    What is the purpose of a lug in an object?

    <p>For attachment</p> Signup and view all the answers

    A spoke is defined as the flat, thin feature of an object that acts as structural support.

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

    What is meant by an 'aligned section'?

    <p>An aligned section is a section view drawn by imagining the rotation of the object's features about a symmetry axis.</p> Signup and view all the answers

    The ________ is a thin, flat feature of an object that acts as a structural support.

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

    When should section lines be omitted in a section view?

    <p>When cutting through a spoke longwise</p> Signup and view all the answers

    Match the following terms with their definitions:

    <p>Spoke = Rod from hub to rim Lug = Ear built for attachment Rib = Structural support feature Web = Flat structural element</p> Signup and view all the answers

    Conventional breaks are used to omit parts of an object that are not important in order to fit long objects onto a drawing medium.

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

    What happens to the appearance of holes when viewed in an aligned section?

    <p>They can give the impression that the holes are unsymmetrical.</p> Signup and view all the answers

    Study Notes

    Orthographic Projection

    • Orthographic projection graphically represents a 3D object on 2D media like paper or a screen.
    • It utilizes lines of sight (LOS) and a plane of projection to create an image.
    • Lines of sight can be parallel or convergent, with parallel projection being further categorized as orthogonal or oblique.
    • Orthographic parallel projection is the focus of this study.

    Multiview Drawing

    • Multiview drawing involves creating multiple related images of an object from different perspectives.
    • Adjacent views provide depth, height, and width information for a complete representation.
    • Multiview drawing relies on the "glass box" concept, which involves rotating the object relative to the observer or moving the observer around the object.
    • Views include top, front, right side, left side, rear, and bottom.

    Object Features

    • Edges represent the boundary between two faces of an object.
    • Surface limits denote the last visible part of a curved surface.
    • Surfaces are areas bounded by edges or surface limits and can be either plane or curved.

    Projections

    • Projections of normal lines, planes, and objects are created by following the principles of the glass box concept to define visibility and hidden lines.
    • Inclined and oblique lines and planes require careful consideration of angles and their projection onto different view planes.
    • Curved lines and surfaces are also projected, with the glass box concept used to accurately represent their form.

    Hidden Line Drawing

    • Hidden lines are used to indicate the existence of edges or features that are not visible from a given viewpoint.
    • Hidden lines should typically join visible lines except when extending from a visible line.
    • Intersections between hidden lines should form L, T, V, or Y corners.
    • Curve hidden lines should begin on a center line.

    Center Line Drawing

    • Center lines are used to represent the center of circles, arcs, and symmetrical features.
    • They begin and end with a long dash.
    • In circular views, the short dash of a center line should cross at the center of the circle or arc.
    • Center lines do not extend between views.
    • For small holes, center lines are represented as thin continuous lines.

    Transferring Depth

    • Depth information can be transferred between views using either direct measurement or the "miter line" method.
    • The miter line method requires drawing a line at a 45-degree angle to transfer depth information.

    Projections with Curved Surfaces

    • When an object has both curved and plane surfaces, careful consideration is needed to represent how the surfaces interact.
    • Lines are annotated as "V" for visible, "H" for hidden, and "C" for center lines.

    Section View Representation

    • Rib, Web, Spoke and Lug are structural features that can be represented in section view.
    • Ribs and Webs are thin, flat features that act as structural support.
    • A Spoke is a rod that radiates from the hub to the rim of a wheel.
    • A Lug is an ear (or projection) built as part of an object for attachment.

    Conventional Practice

    • Omit section lines on the section view of ribs, webs and lugs when the cutting plane passes through them flatwise.
    • Omit section lines on the section view of spokes when the cutting plane passes through them lengthwise.

    Aligned Section

    • An aligned section is a section view drawn by imagining the object’s features rotated about a symmetry axis.
    • This technique helps to show features that would otherwise appear distorted or misleading in a standard section view.

    Conventional Break

    • A conventional break is used to represent long objects that need to be drawn at a smaller scale to fit on the paper.
    • The long portion of the object, which contains no important information, is removed and break lines are drawn at the broken ends.

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    Related Documents

    Chapter 3 Orthographic Projection PDF
    Chapter 4 Conventional Practice in Section View PDF

    Description

    This quiz explores the concepts of orthographic projection and multiview drawing, which are essential for accurately representing 3D objects on 2D surfaces. It covers the fundamentals of lines of sight, projection planes, and the glass box concept in achieving complete object representation. Test your understanding of these critical techniques in technical drawing.

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