As you build your part, consider the relationships you are creating as these relationships can freeze a shape change or introduce an unwanted shape change. Be particularly aware of the following relationships:

• parent/child relationships — If you move a parent, the child moves with it.

• dimension relations — If you define relations between your part’s dimensions and assign a design parameter to the independent dimension, the dependent dimension changes in accordance with the relation you established.

• alignment — If you align an aspect of your part with another aspect of your part and assign design parameters in such a way that the aspect you used for alignment disappears, your part fails to regenerate.

• declared layout relations — If you use a Pro/NOTEBOOK layout when building your part or assembly, Pro/ENGINEER defines relations between the aspects of the part or assembly you declare to the layout and the associated aspect of the layout.

For example, if you declare the length of a part to the layout, Pro/ENGINEER defines a relation tying the part’s length dimension to the layout’s length dimension. The layout dimension is the independent dimension.

Because Pro/ENGINEER treats any part dimension you declare to a layout as dependent, you cannot select the dimension as a Mechanica design parameter without first undeclaring it.

• patterning and mirroring — Patterning and dependent mirroring link the movements of multiple geometric entities. If you use these techniques, you will not be able to move geometric entities individually. Further, you may introduce unexpected topology changes or Mechanica may eliminate a geometric entity altogether. Before using these techniques, consider how you may want the shape of your part to change during sensitivity or optimization studies.

Because it is fairly easy to set up unintentional relationships while building a part, you should perform the following checks:

• Use the Info>Parent/Child command to review parent-child relationships and reassign dimensions when necessary.

• Before you enter Mechanica, select the Edit>References>Reroute Feat>Ref Info command to display the reference information window. Review the data in this file to determine each of the dimension references. When necessary, redefine the dimensioning scheme or redesign the feature.

• Test your design by animating or reviewing the shape changes using the Analysis>Mechanica Design Controls>Shape Animate and Analysis>Mechanica Design Controls>Shape Review commands. If you see any problems or Pro/ENGINEER fails to regenerate the part, redesign the part in a way that prevents conflicts.

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