3.1 - Dimensions

3.1.1 - Parts of a Dimension

With dimensions in AutoCAD, you can add measurements to your drawing, for conveying informationto the audience that will be looking at your drawing.
You can create several types of dimensions and control their appearance by setting up dimension styles or by editing individual dimensions.

Dimensions have several dinstict elements, such as:

Dimension text : Is the dimension value, usually shown inside or above the dimension.
Dimension line : Is the line that represent the distance being dimensioned. It indicates the direction and extend of a dimension. For angular dimensions the dimension line is an arc.
Arrowheads : Are symbols displayed at each end of the dimension line, in different sizes and shapes, for arrowheads or tick marks.
Extension lines : Are the lines that extends from the object being dimensioned, to the dimension line.
Dimension line extension : Is a part of the dimension line that extends beyond the extension line.
Extension beyond dimension line : Specifies a distance to extend the dimension line past the extension line.
Offset from origin : Sets the distance to offset the extension lines from the points on the drawing that define the dimension.
Offset from dimension line : Sets the distance to offset the dimension value (text) from the dimension line.

Fig. - The Components of a Dimension

Fig. - The Components of a Dimension

You can control each of these components, by edtiting or creating dimension styles.

- Types of Dimensions

The basic types of dimensions are:

  • Linear (horizontal and vertical)
  • Aligned
  • Radial (radius, diameter, arc)
  • Angular
  • Continuous
  • Baseline
  • Leader

Fig. - Dimension types

Fig. - Dimension types

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