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Lincolnshire SiS (School Improvement Service)

Lincolnshire SiS (School Improvement Service). Teacher Note. It is not intended that you use this presentation in its entirety. Some of the material is suitable for Key Stage 3, some for Key Stage 4 and some concepts are for Key Stage 5.

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Lincolnshire SiS (School Improvement Service)

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  1. Lincolnshire SiS (School Improvement Service)

  2. Teacher Note • It is not intended that you use this presentation in its entirety. • Some of the material is suitable for Key Stage 3, some for Key Stage 4 and some concepts are for Key Stage 5. • Please edit the show and use the material that is appropriate for the class you are teaching. • Les Porter • CfBT – Lincolnshire School Improvement Service

  3. Pictorial Sketching

  4. Be able to explain thedifference between anaxonometric projection and an obliqueprojection. Be able to explain the difference between an isometric projection and an isometricdrawing/sketch. Be able to create an isometric and obliquesketches from an actual objectand multiviewdrawing. Objectives

  5. Axonometric & Oblique Projection

  6. Parallel & normal to picture plane B A D C B Line of sight A D C Axonometric Projection

  7. a b c B A a D c C b B a A c b D C Axonometric Projection Type of axonometric drawing Axonometric axis 1. Isometric All angles are equal. Axonometric axis Two angles are equal. 2. Dimetric Axonometric axis None of angles are equal. 3. Trimetric

  8. A A Line of sight B B C C D D Oblique Projection Parallel & oblique to picture plane

  9. 45o 60o A 30o B C B A D D C Full scale Half scale 45o 45o Oblique Projection Oblique drawing angle Type of Oblique drawing 2) Cabinet 1) Cavalier

  10. Isometric Projection & Isometric drawing

  11. Isometric Projection Rotate 45 about vertical axis Tilt forward (35o16’) All edges foreshorten about 0.8 time.

  12. Forshorten Full scale Isometric Drawing Isometric drawing is a drawing drawn on an isometricaxes using full scale. Isometric drawing (Full scale) Isometric projection (True projection)

  13. Positions of Isometric Axes Isometric axes can be arbitrarily positioned to create different views of a single object. Regular isometric Reverse axis isometric Long axis isometric View point is looking down on the top of the object. View point is looking from the right (or left) of the object. View point is looking up on the bottom of the object.

  14. True-length distances are shown alongisometric lines. Isometric line is the line that run parallel to any of the isometric axes. Distance in Isometric Drawing Nonisometric lines Isometric axes

  15. Isometric Sketching

  16. Sketch from an actual object 1. Place the object in the position which its shape and features are clearly seen. 2. Define an isometric axis. 3. Sketching the enclosing box. 4. Estimate the size an and relationship of each details. 5. Darken all visible lines.

  17. Sketch from an actual object STEPS 1. Positioning object. 2. Select isometric axis. 3. Sketch enclosing box. 4. Add details. 5. Darken visible lines.

  18. In isometric sketch/drawing), hidden lines are omittedunless they are absolutely necessary to completelydescribe the object. Note Sketch from an actual object STEPS 1. Positioning object. 2. Select isometric axis. 3. Sketch enclosing box. 4. Add details. 5. Darken visible lines.

  19. Sketch from multiview drawing 1. Interprete the meaning of lines/areas in multiview drawing. 2. Locate the lines or surfaces relative to isometric axis.

  20. Top H Top View Front Side W D Front View Side View H Side D Front Bottom View W Bottom Example 1 : Object has only normal surfaces Regular Reverse

  21. D Nonisometric line q y H y x Front View x W Example 2 : Object has inclined surfaces

  22. x B A x C x x B B A C y y C A Nonisometric line Example 3 : Object has inclined surfaces

  23. x C y E A D F B Front View B D C A E F Example 4 Regular Reverse

  24. In isometric drawing, a circle appears as an ellipse. Circle & Arc in Isometric Sketching Steps 1. Locate the centre of an ellipse. 2. Construct an isometric square. 3. Sketch arcs that connect the tangent points.

  25. Four-centremethod is usually used when drawn an isometric ellipse with drawing instrument. Circle & Arc in Isometric Sketching Steps 1. Locate the centre of an ellipse. 2. Construct an isometric square. 3. Construct a perpendicular bisector from each tangent point. 4. Locate the four centres. 5. Draw the arcs with these centres and tangent to isometric square.

  26. Example 5

  27. Irregular Curve in Isometric Steps 1. Construct points along the curve in multiview drawing. 2. Locate these points in the isometric view. 3. Sketch the connecting lines.

  28. Oblique Sketching

  29. Object Orientation Guidelines Place complex features (arc, hole, irregular shape surface parallel to frontal plane.

  30. Object Orientation Guidelines The longest dimension of an object should be parallel to the frontal plane. GOOD GOOD WORSE WORSE

  31. Object Orientation Guidelines Which orientation is better ?

  32. D 45 Sketch from actual object ESTIMATE DEPTH ESTIMATE LINES

  33. Sketch from multiview drawing

  34. Sketch from multiview drawing

  35. E D C B A Sketch from multiview drawing

  36. Sketch from multiview drawing E D C B A

  37. Sketch from multiview drawing E D C B A

  38. Sketch from multiview drawing E D C B A

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