This means that when you open a model that was created in Creo Parametric 3.0 or earlier, you have to update any existing Set Datums to Datum Feature Symbols if you need to make any changes to dimensions, Geometric Tolerances, and so on. Now, Datum Feature Symbols must be associated with model geometry. Prior to Creo Parametric 4.0, Set Datums were derived from existing datum planes or axes. Using the (Set) option in the Datum dialog box.Using the (Set Datum Tag annotation) option in the Datum dialog box, as shown below, or the (Set Datum Tag annotation element) option from inside an annotation feature.
In Creo Parametric 3.0 and earlier, Set Datum Tags could be created in one of two ways: Now, a Datum Feature Symbol is created as either a standalone annotation, or inside of an annotation feature, and can only be placed on a surface, dimension, witness line, or GTOL. In previous releases of Creo Parametric, a Set Datum was created as a property of a plane or axis feature.
If you are new to Creo Parametric 4.0, and have started working with drawings or the Model Based Definition (MBD) annotation tools, you may be asking, “ What is going on with Set Datums?” The simple answer is that Set Datums are replaced by Datum Feature Symbols.
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