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Multiview Projections
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What is the dihedral system?
The process of representing 3D objects on flat drawing surfaces using different views.
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What are the basic elements of Axonometric projection?
Three intersecting coordinate planes. Three axes ( X, Y and Z) .
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How do we determine the front view?
The view that gives the most information about the object.
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What is Axonometric projection?
A type of Multiview orthographic projection used to represent three-dimensional objects on a two-dimensional Surface.
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How many images of an object are produced in Multiview projections?
At least 2
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On which plane is the front view drawn?
The vertical plane
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What are the three most common types of Axonometric projection?
Isometric, Dimetric and Trimetric projection.
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Why is multiview projection useful?
It makes it possible to for us to draw 3D objects.
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The proportions of a dimensioned sketch should be approximately ____________.
accurate
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Name the three views that are needed when doing Multiview projections.
Elevation or front view Plan or top view Profile or sideview
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What is another name for the side view?
Profile
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Sketches should give ________________________________.
all the necessary information about an object
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Why are dotted lines used in Multiview projections?
They are used to show unseen edges blocked by the front view.
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At what angle do the projection planes lie in orthographic projections?
90°
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In the Oblique projection of a cube the X and Y axes give the _________ and _________ of the figure.
height , width
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What does oblique mean?
Neither parallel nor perpendicular. It's slanted or at an angle.
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What are the essential elements for labelling a dimensioned sketch?
Dimension or measurement lines, Extension lines and Dimension or measurement values.
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In dimension sketches all measurements are assumed to be in _______________.
millimetres
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Define Isometric projection.
A type of Axonometric projection in which the axes form 3 equal angles.
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What are Extension lines in Dimensioned sketches?
They are the lines that join the dimension lines to the side of the object that is represented.
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What is another name for the fold line?
Reference line, Line of Intersection or Ground line
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Define Dimetric projection.
A type of Axonometric projection in which two of the three angles are equal.
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What are the basic elements of Multiview Drawing?
Vertical plane, horizontal plane and fold line
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Define Trimetric projection.
A type of Axonometric projection in which none of the angles are equal.
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What is the fold line in Multiview projection?
The line where the vertical and horizontal planes meets.
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Which angle is most commonly used for the X and Y axes in Oblique projections?
135° angle
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In Oblique projections the X and Z axes always________________________.
Form a 90° angle.
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What is a dimensioned sketch?
A drawing that shows the shape of a three-dimensional object along with the measurements of the object.
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