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04 drawing

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Transcript

  • 1. WOOD MATERIALS TECHNOLOGY 4th Edition
  • 2. Chapter 4 Drawing
  • 3. Pencils  Different types of pencil are used for drawing lighter and darker lines  Drawings are usually done with a 2H pencil
  • 4. Drawings  Drawings give enough information to allow an object to be made  Drawings include measurements  Sketches are also used to give information on a drawing sheet
  • 5. Scales  Scales reduce or enlarge the measurements evenly, so that the proportions of the object stay the same  Full size measurements are written on the drawing  The scale is also written as a ratio on the drawing
  • 6. Orthographic projection  A 2D presentation of a 3D object  Shows all the views of an object  Each view is related to the others  Elevations, plans and end views are included in orthographic drawings
  • 7. Orthographic views
  • 8. Sections  Show a cut view of a piece or object  Used when detail needs to be shown clearly − The section through the candle holder shows clearly how the pieces are joined
  • 9. Pictorial drawing
  • 10. Oblique drawing  Lines are drawn back at 45° from the elevation  Draw pieces separately and build up the drawing
  • 11. Isometric axis  Constructing an isometric axis
  • 12. Isometric drawing
  • 13. Examples of isometric drawing
  • 14. Circles in isometric
  • 15. Dimensions
  • 16. Dimensions worksheet 7 Insert these dimensions on the drawing supplied
  • 17. Dimensions worksheet 7 Insert these dimensions on the drawing supplied
  • 18. Dimensions worksheet 8 Elevation End view Insert these dimensions on the drawing supplied Plan
  • 19. Dimensions worksheet 8 Insert these dimensions on the drawing supplied