Multiview Drawing Lecture Part 2
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Transcript of Multiview Drawing Lecture Part 2
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Projection rules
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Projection rule 2
Distance between two points of a feature in related views must be equal
Projection rule 1
Every point of feature in one view much be aligned on a parallel projector in any adjacent view
A
A
B
B
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Projection rule 3
Features are foreshortened when the line of sight are not perpendicular to the feature
Projection rule 4
Features are true length or true size when the line of sight are perpendicular to the feature
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Normal surface
True size and true shape
edgeedge
Application of Projection Rule 3 and 4
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Foreshortened shape
Foreshortened shapeEdge, true size
Inclined surface
Application of Projection Rule 3 and 4
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Oblique surface : •As an area in three views•None of it is in true size
Surface B is an oblique surface
Application of Projection Rule 3 and 4
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Surface C
Projection rule 5
Area that are the same feature will always be similar in configuration from one view to the next, unless viewed from on edge.
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Similar areas:Oblique surface
Application of Projection rule 5
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Similar areas:Inclined surface
Application of Projection rule 5
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Surface G and F
Projection rule 6
Parallel features will always parallel in all views.
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Front view: Surface1-2(vertical), G, F
Projection rule 7
Surfaces that are parallel to the line of sight will appear on edge and represented as line.
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Surface B and C, B and G, A and B
Projection rule 8
No two contiguous surfaces lie in the same plane
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Adjacent areas
Application of Projection rule 8
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Vertex labeling
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Surface labeling
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In-class activity: Surface labeling
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In-class activity Missing line problem 1
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In-class activity Missing line problem 2
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In-class activity Missing view problem 1
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In-class activity Missing view problem 2
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More missing line, missing view problems
Homework: Textbook page 289 Problem 5.3( missing view problems)Problem 5.4 (missing line problems)
Do not hand in, self-practice only