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# Ch.5 Multiview Drawings - PowerPoint PPT Presentation

Ch.5 Multiview Drawings. Objective: Learn the rules for reducing a 3D object onto a 2D multiview drawing and learn some hints for visualizing a 3D object from a 2D multiview drawing. Projection theory and multiview projection planes (5.1 through 5.3) 6 principal views (5.4)

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Objective: Learn the rules for reducing a 3D object onto a 2D multiview drawing and learn some hints for visualizing a 3D object from a 2D multiview drawing.

• Projection theory and multiview projection planes (5.1 through 5.3)

• 6 principal views (5.4)

• View selection rules (5.5)

• Fundamental views of edges and planes (5.6)

• Multiview representations (5.7)

• Multivew drawings visualization and summary (5.8 & 5.10)

• ANSI standards for multiview drawings (5.9)

• See Fig. 5.1 to locate the multiview projections in the taxonomy of projects: Projection  Parallel projections  Orthographic projections  Multiview projections.

Object

Projection plane

Line of sight

• Multiview projection is an orthographic projection for which the object is behind the plane of projection, and the object is oriented such that only two of its dimensions are shown.

Open up the glass box, producing the 6 principal views.

US (ANSI 3rd-angle projection) vs. ISO (1st-angle projection)

• Determine the best position of the object. Try to make the surfaces of major features either perpendicular or parallel to the projection planes.

• Define the front view. The front view should show the object in its natural or assembled state.

• Determine the minimum number of views is needed to completely describe the object so it can be produced.

• Once the front view is selected, determine which other views will have the fewest number of hidden lines.

Good orientation

Normal plane

Oblique plane

Inclinedplane

Oblique line

Normal line (true-length line)

Inclined line

• Many examples of multiview representations are given in this chapter. The best method to learn the art of multiview representation of 3D objects is to draw by yourself, with tools or freehand, the objects shown in Figures 5.47 through 5.68. We do not have time to cover all that are presented in the chapter. I present here only those that require a bit of explanations.

• Practice makes perfect. Without it, you will never learn this art of visualizing 3D objects from 2D multiview drawings.

• Projection studies

• Physical model construction

• Missing lines

• Vertex labeling

• Analysis of solids

• Analysis of surfaces

• Partial view

• Revolution

Too “busy”

• Revolution

• Removed view

Make the drawings easy to understand!