Assembly Closure
Creo EZ Tolerance Analysis automatically considers the mating features specified in the Stackup definition to be exactly coincident, even if the components in the Creo assembly model are not perfectly aligned. If the Creo assembly model includes a gap between mating components, Creo EZ Tolerance Analysis will “close” the gap between them when calculating the Stackup nominal value. In this case the calculated Stackup nominal value will be slightly different from the distance between the start and end features of the Stackup as measured in the Creo assembly model.
If you want to include any gaps between parts in the Stackup definition, use the Add Offset tool to specify the nominal value of the distance and the associated tolerance.
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Creo EZ Tolerance Analysis does not indicate the presence of closures. Therefore, it is possible to have incorrect nominal Stackup values if you inadvertently select the wrong feature of a part when defining the assembly constraints during the loop definition. Placing the pointer on each of the features in the Stackup Details table highlights the associated object in the CAD model, so that you can verify the selections.You can also use the Show Stackup tool to better visualize the Stackup components in the positions defined by the Stackup.
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