When you convert a part to precise, Abaqus/CAE tries to change neighboring entities so that their geometry matches exactly. Converting to a precise representation usually reduces the number of imprecise entities in a part, though for some parts the conversion can increase the number of imprecise entities. Even when the number of imprecise entities increases, the maximum tolerance of the healed part will still usually decrease; however, you should consider suppressing or deleting the convert to precise operation when the number of imprecise entities increases.
The convert to precise operation can be a lengthy one, and it can increase the complexity of the imported part; so subsequent processing of the part may be slower. Invalid entities may also result from this operation.
To convert to precise:
From the main menu bar, select Tools
Geometry Edit.
Abaqus/CAE displays the Geometry Edit dialog box.
Tip:
You can also convert to precise using the 
tool, located with the edit tools in the Part module toolbox. For a diagram of the edit tools in the toolbox, see “Using the Geometry Edit toolset,” Section 69.1.
From the dialog box, select the Part category and the Convert to precise method.
From the warning dialog box that appears, click OK.
Select one of the following methods for the conversion:
Tighten Gaps
Abaqus/CAE attempts to reduce the gaps between the nodes and edges in your part but does not perform a full computation of the geometry. This option provides a faster but less complete conversion.
Recompute Geometry
Abaqus/CAE tries to change neighboring entities so that their geometry matches exactly. Recomputing geometry usually results in precise geometry; however, this operation can be lengthy and increases the complexity of the imported part, which means that processing of the part is slower. Moreover, if the part contains many complex surfaces, converting to a precise representation is likely to fail. If possible, you should return to the CAD application that generated the original file and increase the precision.
If you have finished editing the part, you should check its validity by clicking mouse button 3 on the part in the Model Tree and selecting Update validity from the menu that appears.
