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Creating Embedded Datum Features

Embedded datum features contain any combination of plane, axis, point, or coordinate systems embedded within another feature.
• Benefits of Embedded Datum Features:
– No need to restart feature creation.
– More organized models.
– Automatically hidden datums.

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Figure 2 – Datum Group Benefits of Embedded Datum Features

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Figure 1 – Embedded in an Extrude

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Figure 3 – Embedded in a Datum
There are several uses for embedded datum features, such as sketch planes, orientation planes, dimensioning references, placement references for holes, and references for draft features. Datum features can even be embedded in other datum features.
Suppose you have begun the creation of an extrude feature, and then realize the sketch plane you need has not yet been created. You could cancel out of the Extrude Tool, create the datum plane, and then start the Extrude Tool again. A better solution would be to simply create the sketch plane as an embedded datum, while the Extrude Tool is still open. Another benefit of embedded datum features is that they produce a cleaner, more organized model tree. For example, if the sketch plane of an extrude feature you are creating requires you to create three datum planes and an axis, those four datum features are embedded within the node of the extrude feature. Unlike regular features, the embedded datum features do not clutter the model tree.
Each embedded datum feature functions as some type of reference to the feature in which it is embedded, otherwise it would not be embedded. This enables you to easily determine the function of each datum and identify the feature that references it.
The display of embedded datum features is automatically set to hidden after they are created. This helps ensure that the display of your model remains uncluttered. In the following figure, notice the three different displays of the same model tree. The model on the left was created without using embedded datum features. The model in the middle was created using embedded datum features and the feature nodes are expanded. The model on the right displays the same model shown in the middle, except in this case the feature nodes are collapsed.
Creating Embedded Datum Features Embedded datums are created by starting a datum tool during the creation of another feature. Starting the datum tool automatically pauses the creation of the current feature, enabling you to create the required datum feature.The quickest way to create embedded datum features is to click Datum to expand the Datum group, located to the far right of the sketched feature’s dashboard, as shown in Figure 2. Of course, you can always select the Model tab while in feature creation and select the desired datum feature type from the Datum group.After you have created the required datum features, you can resume the creation of the feature by clicking Resume Feature in the dashboard.By then selecting the newly created datum features as sketch planes, orientation, dimensioning, placement, or depth references, they are embedded in the feature.

About Embedded Datum Features
When you delete a feature containing embedded datum features, Creo Parametric provides the option to keep or delete the embedded datum features.

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Sketch and orientation datum planes can only be embedded in features using internal sketches. If for some reason the datum features you create are not embedded as expected, you can select them in the model tree and drag them into the feature after creation. This embeds them and sets their display to hidden, just as if they were originally embedded. Datums can be un-embedded in the same way, by dragging them from a feature back to the model tree.
Best Practices
Embedded datum features should be used as the design intent dictates. For example, you cannot reuse an embedded datum feature in a downstream feature. Using embedded datum features promotes the creation of models that are easier to edit and utilize, and thus easier to share with downstream users.

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