# PSU METBD 110 - Multiview Sketching & Projection (55 pages)

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## Multiview Sketching & Projection

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## Multiview Sketching & Projection

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Lecture Notes

Pages:
55
School:
Pennsylvania State University
Course:
Metbd 110 - SOLIDS MODELING I
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Chapter 5 Multiview Sketching Projection Print handouts Select File Print Edit the following selections to read Select the OK button Orthographic Projection A system of drawing views of an object using perpendicular projectors from the object to a plane of projection I e paper Six Standard Views Top front right side left side back and bottom Front Usually shows most detail If applicable should show object in operating condition I e car View Placement 3rd angle projection Front view usually shows the most detail Projection Lines must views be arranged so that Why they align make it possible for someone To to interpret the drawing Revolving an Object to Produce the Six Basic Views The Glass Box Metaphor Imagine that the object you are going to draw is positioned inside a glass box so that the large flat surfaces of the object are parallel to the walls of the box 2 horizontal planes 2 frontal planes 2 profile planes From each point on the object imagine a ray or projector perpendicular to the wall of the box forming the view of the object on that wall or projection plane 2 horizontal planes top and bottom views 2 frontal planes front and back views 2 profile planes right and left side views Projection of an Object Projection of an Object 8 Unfolding the Glass box For Third Angle Projection the method in the U S Imagine that the walls of the box are hinged and unfold the views outward around the front view This will give you the standard arrangement of views for 3rd Angle Projection which is used in the US Canada and some other countries Third Angle Projection Symbol for third angle projection shown on dwg First Angle Projection Symbol for first angle projection 10 Glass Box Method DEMO If a point line or plane is in one view it must be in all the views 12 Hidden Lines 13 Precedence of Lines When visible lines hidden lines and center lines coincide remember Visible lines take precedence over hidden lines Hidden lines take precedence over center lines For example Figure

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