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Capturing Design Intent in Features

Capture design intent in your model’s features by deciding which feature options to use.
• Option considerations include:
– Depth
– Solid/Thicken
– Round/Chamfer type
– Hole type
– Sketch or select sweep trajectory
• Internal versus external sketches
• Embedded datum features

Capturing Design Intent in Features 1
Figure 1 – Internal Versus External Sketches

Capturing Design Intent in Features 2
Figure 2 – Embedded Datum Features
Capturing Design Intent in Features Design intent is captured in features by specifying the correct feature and its options. As a result, you must carefully consider which feature options to specify to properly capture your design intent. You can always modify the feature’s design intent, but it is easiest to do when you have planned for future modifications. Considerations When Capturing Design Intent in Features
When you create a new feature in Creo Parametric, consider the options available for capturing design intent in each of the following areas. Your decisions in these areas at the time of feature creation impact the overall model downstream when you wish to modify it.
• Depth — When creating an extrude feature, determine whether the depth should be symmetric or defined with 2-sided blind depth values. Determine whether the depth is to be defined to a reference. If so, remember that the reference you select becomes a parent to the feature. Or consider if the depth should be Through All?
• Solid or Thicken — Determine whether the feature you create should be a solid feature in which you create a cut through, or a thickened feature with a defined thickness. If so, which side?
• Round/Chamfer type — Determine which type of chamfer best captures your design intent. Is it better to use a 45 x D or a D x D? Again, considering how the design may change in the future helps you decide. Should the round be created by selecting the edge or by selecting the two surfaces in your model? If you believe that the design may change so that the edge disappears, use the two surfaces.
• Hole type — Determine which dimensioning scheme works best in your design. Which would be best – to the tip or to the shoulder of the hole?
• Internal versus external sketches — In Figure 1, notice that feature Extrude 2 was created using an external sketch, but feature Extrude 3 was created using an internal sketch. Which sketch you ultimately use for feature creation depends upon these factors:
– You must use an internal sketch to create Geometry Points in the sketch.
– Internal sketches reduce clutter in the model tree. As shown in Figure 1, there are two additional model tree entries for Sketches 1 and 2 due to the fact that these were external sketches. Had Extrude 1 and Extrude 2 been created with internal sketches, neither of these entities would
exist in the model tree.
– External sketches are helpful when you want to test multiple design alternatives for a feature. You can select alternate external sketches to test these design alternatives.
• Embedded datum features — Embedded datum features are useful when you want to edit features as if they are one feature. This also simplifies the tree and reduces the display clutter. In Figure 2, Extrude 4 was created using five embedded datum features. However, embedded datum features are not recommended if you want to reuse the datums for other features.

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