Dimensioning

• What is dimensioning in technical drawing?


  Dimensioning is the process of applying measurements to a technical drawing.
• Why is dimensioning crucial in technical drawings?


  It communicates the information required for the manufacture of products.
• What are the general principles of dimensioning in technical drawings?


  • Each dimension should be shown once.
  • Do not calculate dimensions from others or scale the drawing.
  • Only include necessary dimensions to define the product.
  • Linear dimensions must be expressed in millimetres.
• How should dimensions be placed on a technical drawing?


  Dimensions should be placed in the middle of the dimension line above and clear of it.
• What should be avoided when placing dimensions on a drawing?


  Dimensions should not be crossed or separated by other lines on the drawing.
• How should angular dimensions be oriented on a drawing?


  Angular dimensions should be oriented to be read from the bottom or the right-hand side of the drawing.
• What should be done when space is limited for dimension placement?


  The dimension can be placed centrally, above, or in line with the extension of one of the dimension lines.
• Where should larger dimensions be placed in relation to smaller dimensions?


  Larger dimensions should be placed outside smaller dimensions.
• Where should diameter dimensions be placed for clarity?


  Diameter dimensions should be placed on the view that provides the greatest clarity.
• What are the types of dimensioning used in technical drawings?


  • Parallel Dimensioning
  • Chain Dimensioning
  • Combined Dimensioning
• What is parallel dimensioning?


  Parallel dimensioning is the placement of a number of single dimension lines parallel to one another.
• What does chain dimensioning consist of?


  Chain dimensioning consists of a chain of dimensions.
• What is combined dimensioning?


  Combined dimensioning uses chain dimensioning and parallel dimensioning on the same drawing view.
• How do parallel dimensioning and chain dimensioning differ?


  • Parallel dimensioning: Multiple dimension lines parallel to each other.
  • Chain dimensioning: A continuous chain of dimensions.