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Notes on Working with Associative Dimensions and Designations |
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An associative dimension/designation is linked to the base object (for example, a datum designation is linked (associated) with the segment representing the base surface. The Associativity constraint is imposed on the associative dimension/designation.
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Designations may be associated both with geometric objects and with other designations or dimensions. For example, designation of a datum, a surface finish or a leader can be associated with a dimension, and you can choose the required dimension element: dimension line or extension line, leader, or landing. |
The Associativity constraint occurs automatically when creating a dimension/designation in the parametric mode. This constraint cannot be applied manually. Therefore, if the constraint was removed or if the dimension or designation must be associated with another object, enter the dimension or designation editing mode and specify the required base object.
When you delete or explode an object, all its associated dimensions and designations are deleted. Be careful when you transform a dimension on a landing to a dimension without landing: if any designations were associated with a leader or a landing, they will disappear.
Note the following features of some associative designations.
•Datum symbol, geometric tolerance designation
•If a designation branch is associated with a dimension line of a dimension, then it is oriented along this line and located outside it. Due to this, immediately after creation of a geometric tolerance designation branch associated with the dimension line will have two segments, one of them lying on the dimension line extension. These two segments cannot be transformed into one (i. e., the vertex between them cannot be deleted) as long as the designation is associative.
•If a designation branch is associated with another object, it can be arbitrarily oriented with respect to this object.
•Leader (including as part of other designations)
All or some branches of a leader can be associated with objects. To make a branch associative or non-associative, enable or disable the parametric mode prior to creating this branch.
•Projection designations
Projection designations (i. e., designations sent to the drawing from a model) can only be associated with other projection designations or with geometric objects constituting a model’s projection. For example, you can associate a datum designation set to a model face with a dimension. More details on working with projection designations...
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Unlike other associative objects, a linear dimension has no Associativity constraint, but is considered associative if the start points of its extension lines coincide with the points of the geometric object. This is why a non-associative linear dimension can be manually associated with the required object by applying the Point Coincidence (and/or Curve Midpoint) constraint to the extension lines of the dimension. |
