Limitations in Converting TAE Stackups
The following are the differences between the Tolerance Analysis Extension (TAE) and EZ Tolerance Analysis applications that lead to restrictions in importing TAE measurements or stackups:
• To define the stackup loop, TAE requires you to select parametric or driven dimensions from the parts. EZ Tolerance Analysis application has a different workflow in which features are used to define the stackup loop, and dimensions are derived from the selected features.
It is easier to define the equivalent stackup in EZ Tolerance than to implement a workflow that maps the features to the dimensions. The imported TAE stackups lack editing options when compared with the stackups created within EZ Tolerance Analysis.
• In TAE, the terms left and right are used for biasing options when there is clearance between parts. For example, bolts in clearance holes that contribute to the stackup variation. In EZ Tolerance Analysis, the terms Minimize and Maximize are used because, the part loop can be defined and shown in any direction.
Similarly, unlike TAE that allows the selection of Centered for such interfaces, EZ Tolerance Analysis considers the centered condition when the features of size always have interference, for example, press fits.
If EZ Tolerance Analysis detects clearance, the Centered option in TAE changes to Floating in EZ Tolerance Analysis. However, you can adjust the tolerances using limit tolerances to define a range to ensure interference that results in centered condition.
In these scenarios, the results in TAE and EZ Tolerance Analysis may differ. In EZ Tolerance Analysis, the Import Warning dialog box displays the warning that all assembly biases must be verified.
• In TAE, the Virtual Component function involves addition of a dimension annotation at the assembly model. Although there is limited support for an equivalent functionality in EZ Tolerance Analysis that uses offsets between parts, the application does not support two or more consecutive assembly-level dimensions including the dimensions to the start or end features of the stackup.
In such cases, TAE Analysis Measurements are not imported.
• Because TAE does not include the effect of Material Condition Modifiers—(MMC and LMC) in the results, EZ Tolerance Analysis does include such effects. Whenever the imported TAE Analysis Measurement includes any material modifiers, a message appears explaining that the results will differ.
• Because TAE requires all dimensions in the analysis to be in the Creo Parametric model files, EZ Tolerance Analysis considers that all dimensions are linked while importing. You can unlink or link the EZ Tolerance Analysis stackups, if required.
• Analysis features are not supported in EZ Tolerance Analysis. However, those that are created in TAE are updated when the associated analysis is imported. This is the case even when you change the tolerance value on the EZ Tolerance tab, assuming the dimension is still linked within EZ Tolerance Analysis.
• Other limitations include the following:
◦ Datum features for any geometric tolerances do not appear in EZ Tolerance Analysis.
◦ The nominal distance appears, but the dimension loop is not generated. Place the pointer on the dimension or select a dimension in the stackup Details table, to highlight the associated dimension in the graphics window.
◦ EZ Tolerance Analysis cannot check the possible, significant 2D and 3D effects.