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Arrowheads, also called symbols of termination, are displayed at each end of
the dimension line. You can specify different sizes and shapes for arrowheads
or tick marks.
Extension lines, also called projection lines or witness lines, extend from the
feature to the dimension line.
A center mark is a small cross that marks the center of a circle or arc.
Centerlines are broken lines that mark the center of a circle or arc.
Associative Dimensions
Dimensions can be associative, nonassociative, or exploded. Associative
dimensions adjust to changes in the geometric objects that they measure.
Dimension associativity defines the relationship between geometric objects
and the dimensions that give their distance and angles. There are three types
of associativity between geometric objects and dimensions.
â– Associative dimensions. Automatically adjust their locations,
orientations, and measurement values when the geometric objects
associated with them are modified. Dimensions in a layout may be
associated to objects in model space. The DIMASSOC system variable is
set to 2.
â– Non-associative dimensions. Selected and modified with the geometry
they measure. Non-associative dimensions do not change when the
geometric objects they measure are modified. The dimension variable
DIMASSOC is set to 1.
â– Exploded dimensions. Contain a collection of separate objects rather
than a single dimension object. The DIMASSOC system variable is set to
0.
You can determine whether a dimension is associative or non-associative by
selecting the dimension and doing one of the following:
â– Use the Properties Inspector to display the properties of the dimension.
Dimensions and Tolerances | 563
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