Types of dimensions

• Dimensions should be clearly separated into two categories, size dimensions and location dimensions. Size dimensions will represent information such as diameter or width and length. Location dimensions will describe how objects are positioned relative to the other objects on the page.
  
  

Dimensioning Procedure

• Analyze each object before describing it by breaking it down into simple geometric shapes. The simpler the shape, the easier it is to define using dimensioning techniques. Locate a relative center line (a line that is part of the background grid rather than image) and create a location dimension. Then include all additional dimensions such as height, width and length.
  
  

Notation System 1: Aligned Dimensions

• A drawing using aligned dimensions places figures and notations in alignment with each corresponding object. This creates specificity when looking at the page as each object's notations will be read in the same direction as its dimension line.
  
  

Notation System 2: Unidirectional Dimensions

• The unidirectional dimensions technique maintains one direction for all notations on the page. Each object's figures and notations will follow common left-to-right reading style rather than conforming to the direction of each individual object's dimension lines.