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Chapter 5 Isometric Sketching

Chapter 5 Isometric Sketching. Be able to explain the difference between an axonometric projection and an oblique projection. Be able to explain the difference between an isometric projection and an isometric drawing/sketch.

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Chapter 5 Isometric Sketching

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  1. Chapter 5 Isometric Sketching

  2. 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

  3. Axonometric & Oblique Projection

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

  5. 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

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

  7. 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

  8. Isometric Projection & Isometric drawing

  9. Isometric Projection Rotate 30 about vertical axis

  10. Full scale Isometric Drawing Isometric drawing is a drawing drawn on an isometricaxes using full scale. Isometric drawing (Full scale)

  11. 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.

  12. 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

  13. Isometric Sketching

  14. 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.

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

  16. 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.

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

  18. 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

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

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

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

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

  23. Example 5

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