Scale drawing

• Scale drawing


  The drawing of an object in its full, reduced or enlarged sizes
• Tools for scale drawing

  • Ruler
  • Metric rule in millimeters (mm)
  • Metric rule in centimeters (cm)
  • Scale rules
• Ruler

  An instrument used to measure the length, height or width of an object, graduated in metric units
• Scale rules

  Used to reduce or enlarge dimensions, available in flat and triangular forms
• Types of scale

  • Full scale
  • Reduced scale
  • Enlarged scale
• Full scale

  Drawing an object in full size
• Reduced scale

  • 1:2 - object drawn half the full size
  • 1:10 - object drawn 1/10th of the full size
  • 1:50 - object drawn 1/50th of the full size
• Enlarged scale

  • 2:1 - object drawn twice the full size
  • 10:1 - object drawn 10 times the full size
  • 100:1 - object drawn 100 times the full size
• Scale calculation

  Scale = Length on paper / Actual length
• Forms of scale

  • Plain scale
  • Diagonal scale
• Plain scale

  Has two units of measurement, e.g. metres and decimetres, centimetres and millimetres
• Diagonal scale

  Helps measure to a fine degree of accuracy with three units of measurement