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Chapter 3 Orthographic projection

Chapter 3 Orthographic projection. PROJECTION SYSTEMS. 1. First angle system. - European country - ISO standard. First Quadrant. 2. Third angle system. - Canada, USA, Japan, Thailand. Third Quadrant. ORTHOGRAPHIC PROJECTION. 3 rd angle system. 1 st angle system.

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Chapter 3 Orthographic projection

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  1. Chapter 3 Orthographic projection

  2. PROJECTION SYSTEMS 1. First angle system - European country- ISO standard First Quadrant 2. Third angle system - Canada, USA, Japan, Thailand Third Quadrant

  3. ORTHOGRAPHIC PROJECTION 3rd angle system 1stangle system

  4. ORTHOGRAPHIC VIEWS 3rd angle system 1stangle system

  5. REVOLVE THE OBJECT Top view Right side view Front view

  6. OBSERVER MOVE AROUND Top view Front view Right side view

  7. THE GLASS BOX CONCEPT Rear view Left side view Bottom view

  8. History Depth Width Height

  9. OBJECT FEATURES are lines that represent the boundarybetween two faces. Edges Represent the intersection of two ormore edges. Corners Edge Edge No edge Corner No corner No corner

  10. Surface Surface Surface OBJECT FEATURES are areas that are bounded by edges or limiting element. Surfaces is a line that represents the last visible part of the curve surface. Limitingelement Limit Limit

  11. PROJECTION OF OBJECT The views are obtained by projecting all object features to the picture plane. You have to project the remaining surfaces which are invisible too !

  12. s s s PROJECTION OF OBJECT

  13. PROJECTION OF OBJECT

  14. Line Convention

  15. LINE CONVENTION Precedence of coincide lines. Hidden line drawing. Center line drawing.

  16. PRECEDENCE OF LINE Order of importance Visible line Hidden line Center line

  17. HIDDEN LINE PRACTICE Hidden line should join a visible line, except itextended from the visible line. Leave space Correct Join No !

  18. HIDDEN LINE PRACTICE Hidden line should join a visible line, except itextended from the visible line. Leave space Leave space Correct No !

  19. HIDDEN LINE PRACTICE Hidden line should intersect to form L and Tcorners. L Correct T No !

  20. CENTER LINE PRACTICE In circular 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

  21. CENTER LINE PRACTICE Leave the gap when centerline forms a continuation with a visible or hidden line Center line should always start and end with long dash. Leavespace Leavespace Leavespace Leavespace

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