Before you create the model

• Set units to mm.

In the Construction Settings window:

• The Rational geometry flag can be toggled OFF.

Set tolerances as follows:

• Curve Fit Distance = .01 mm (lower as necessary)
• Curve Fit Checkpoints = 10
• Max Gap Distance = .01 mm (this value should remain the same as Curve Fit Distance)
• Trim Curve Fit =.005 mm (lower as necessary)

While you create the model

• Use degree 5 curves and surfaces to achieve curvature continuity between surfaces and successful data transfer.
• Periodically transfer models from Alias to UGS NX during construction to manage the quality of the model being created.
• Stitch the Alias model successfully before export, but also periodically stitch the geometry to ensure that the model meets all tolerance requirements.
• Avoid using Object Edit > Attach > Attach since this tool creates multiknots in Alias geometry.
• Avoid using Surfaces > Skin between trimmed surface boundaries, since excessive amounts of data are created in the resulting surface. If Skin is used between trim boundaries, check the resulting surfaces for multiknots before export.
• Use surface building tools such as Surfaces > Boundary Surfaces > Square and Surfaces > Swept Surfaces > Rail Surface to ensure and control curvature continuity between surfaces.