2013

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If the associated geometric object undergoes a boolean operation such as
UNION or SUBTRACT
If grip editing is used to stretch a dimension parallel to its dimension line
If the association to a geometric object is specified using the Apparent
Intersection object snap, and the geometric object is moved so that the
apparent intersection no longer exists
In other circumstances, a dimension may become partially associated. For
example, if a linear dimension is associated with the endpoints of two
geometric objects and one of the objects is erased, the remaining association
is preserved. The disassociated end of the linear dimension may then be
associated with another geometric object using DIMREASSOCIATE.
NOTE The Command prompt displays a warning message if a dimension is
disassociated.
Modify Non-associative Dimensions
For non-associative dimensions, when you edit dimensioned objects, you
must include the relevant dimension definition points in the selection set, or
the dimension is not updated. Definition points determine the dimension
location. For example, to stretch a dimension, you must include the appropriate
definition points in the selection set. You can easily include them by turning
on grips and selecting the object so that the grips are highlighted.
The definition points for each type of dimension are indicated in the following
illustrations. The middle point of the dimension text is a definition point for
all dimension types.
598 | Chapter 9 Annotate Drawings