Technical Drawing
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Technical Drawing

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An introduction to the styles and importance of technical drawing

An introduction to the styles and importance of technical drawing

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  • 1. technical drawing
  • 2. introduction
    • Technical drawings:
      • Clearly define aspects of engineered items
      • Conform to standards
      • Minimize confusion
    1.8ish Build this!
  • 3. obstacles between the real world and your drawing
    • We live in a 3-dimensional world.
    • Paper constrains us to 2 dimensions.
    • You cannot easily measure a drawing.
  • 4. solutions
    • 3-dimensional objects can be represented in a 2D space by two primary methods:
      • Orthographic Projection
      • Isometric Projection
  • 5. orthographic projection
    • Orthographic projection uses multiple views of the subject, from points of view rotated about the subject's center through increments of 90°.
  • 6. isometric projection
    • Isometric projection captures the object from an upward angle and disregards perspective
    • This can cause some confusing issues
  • 7. dimensioning
    • Dimensions in cooperation with a drawing should provide sufficient information to allow anyone to machine the object.
    • With complex objects involving many dimensions, dimensioning can get messy.
  • 8. dimensioning types
    • Parallel dimensioning:
      • Parallel dimensioning consists of several dimensions originating from one projection line.
  • 9. dimensioning types
    • Superimposed Running Dimensions
    • The common origin for the dimension lines is indicated by a small circle at the intersection of the first dimension and the projection line.
  • 10. dimensioning types
    • Chain Dimensioning
    • Chains of dimension should only be used if the function of the object won't be affected by the accumulation of the tolerances.
  • 11. dimensioning types
    • Dimensioning by Co-ordinates
    • Two sets of superimposed running dimensions running at right angles can be used with any features which need their centre points defined, such as holes.
  • 12. line styles
    • visible lines - are continuous lines used to depict edges directly visible from a particular angle.
    • hidden lines - are short-dashed lines that may be used to represent edges that are not directly visible.
    • center lines - are alternately long- and short-dashed lines that may be used to represent the axes of circular features.
  • 13. why?
    • If you want your idea or mechanism to be seriously considered, submit technical drawing demonstrating the functionality and form.