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Chapter 03 orthographic projection
This document discusses orthographic projection and multiview projection techniques. It explains that an object can be represented through multiple views that each show two dimensions of its three principal dimensions. These views are obtained by either revolving the object or moving the observer around the object. The document also covers topics like line conventions for hidden, visible and center lines in multiview drawings.
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Introduction to orthographic projection and its key concepts, including object representation and multiview projection.
Exploration of multiview projection, emphasizing the three principal dimensions of an object: width, depth, and height, and the observer's perspective.
Details on the various views in multiview projection, including front, right side, top, bottom, left side, and rear views, known within the glass box concept.
Description of object features in orthographic projection, including edges, corners, and the projection of object features onto the picture plane.
Guidelines on line convention in technical drawing, addressing visible, hidden, and center lines, with examples of correct and incorrect practices.
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Chapter 03 orthographic projection
- 1.
- 2. TOPICS Object representation Glass boxconcept Line convention Orthographic projection of point, line, plane, surface and object. Multiview projection
- 3.
- 4. MULTIVIEW PROJECTION Three principledimensions of an object ā¦ Width Depth Height Width Height Depth Depth ā¦ can be presented only two in each view. Adjacent view(s) is needed to fulfill the size description.
- 5. 1. Revolve theobject with respect to observer. TO OBTAIN MULTIVIEW REPRESENTATION OF AN OBJECT 2. The observer move around the object.
- 6. REVOLVE THE OBJECT Front view Rightside view Top view
- 7. OBSERVER MOVE AROUND Front view Rightside view Top view
- 8. THE GLASS BOXCONCEPT Bottom view Left side view Rear view
- 9.
- 10. MULTIVIEW PROJECTION Click onthe picture to play video
- 11. MULTIVIEW PROJECTION Click onthe picture to play video
- 12. MULTIVIEW PROJECTION Click onthe picture to play video
- 13. MULTIVIEW PROJECTION Click onthe picture to play video
- 14.
- 15. OBJECT FEATURES Edges arelines that represent the boundary between two faces. Corners Represent the intersection of two or more edges. Edge Corner Edge No edge No corner No corner
- 16. Surfaces are areasthat are bounded by edges or limiting element. Limiting element is a line that represents the last visible part of the curve surface. Surface Surface Surface Limit Limit OBJECT FEATURES
- 17. PROJECTION OF OBJECT Theviews are obtained by projecting all object features to the picture plane. You have to project the remaining surfaces which are invisible too ! You have to project the remaining surfaces which are invisible too !
- 18.
- 19.
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- 21. LINE CONVENTION Precedence ofcoincide lines. Hidden line drawing. Center line drawing.
- 22. PRECEDENCE OF LINE Visible line Visible line Orderof importance Hidden line Hidden line Center line Center line
- 23. HIDDEN LINE PRACTICE Hiddenline should join a visible line, except it extended from the visible line. Correct No ! Join Leave space
- 24. Correct No ! Hiddenline should join a visible line, except it extended from the visible line. Leave space Leave space HIDDEN LINE PRACTICE
- 25. Hidden line shouldintersect to form L and T corners. Correct No ! L T HIDDEN LINE PRACTICE
- 26. Hidden arcs shouldstart on a center line. HIDDEN LINE PRACTICE
- 27. CENTER LINE PRACTICE Incircular view, short dash should cross at the intersections of center line. For small hole, center line is presented as thin continuous line. Center line should not extend between views. Leave space Leave space
- 28. Leave the gapwhen centerline forms a continuation with a visible or hidden line Leave space Leave space Leave space Leave space Center line should always start and end with long dash. CENTER LINE PRACTICE