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NX >> Pro/ENGINEER / Creo Elements

The following settings are recommended up to NX 11 and Pro/ENGINEER Wildfire 5.0 / Creo Parametric 3.0

NX – System

  • Delete blanked elements before preprocessing.
  • To transfer colors of assemblies the colors should be set and saved with the individual components, not the assembly.
  • Note that NX uses the radius of a "tolerance tube", other CAD Systems like CATIA V4 define "tolerance" as the distance between two points.
  • Select Analysis -> Examine Geometry -> all options -> all elements (up to NX2). 
  • Select Analysis -> examine Geometry -> Set All Checks (up to NX8.5) The marked elements are likely to cause problems with data exchange, depending on the messages as explained below:
  • Severe errors:
    data structures, consistency, face-face intersections, self-intersections
  • Might cause problems:
    tiny, face smoothness, spikes/cuts, edge tolerances
  • Without negative influence on data exchange:
    misaligned, sheet boundaries, edge smoothness

NX - STEP Preprocessor

  • Start the external STEP processor with File -> Export -> STEP214.
  • Select Data to Export and define the options:
  • Object Types: One or more of the options Solid, Product Data, Surface, and Wireframe (depending on model).
  • The default tolerance value in menu Advanced -> Parameters -> B-Spline Aprx. Tol. of 1.01*10-5 mm can cause to very large STEP files and should be reduced in such cases(recommended value: 10-3 mm).
  • Recommended is to use the default settings in menu Translation Control (Tolerant Modeling).
  • Special characters in the filename of the STEP file are not allowed. The model will not be exported.
  • Validation properties are supported.

STEP File

  • An adjustment of the STEP file is not necessary.

Pro/ENGINEER / Creo Elements - STEP Postprocessor

  • Some STEP specific settings can be added to the configuration file config.pro:
  • With Tools -> Options... you can add the below mentioned settings in Pro/ENGINEER Wildfire.
  • With File -> Options -> Configuration Editor you can add the below mentioned settings in Creo Elements
  • With Utilities -> Options...  you can add the below mentioned settings in Pro/ENGINEER 2001.
  • With Utilities -> Preferences...  you can add the below mentioned settings in Pro/ENGINEER 2000i2.
  • Recommended config.pro options:
  • fix_boundaries_on_import yes
  • enable_absolute_accuracy yes
  • intf3d_in_close_open_boundaries yes
  • intf_in_blanked_entities yes
  • To import a part (does not work with assemblies) in Pro/ENGINEER 2001 with an accuracy other than the default accuracy, the following procedure is recommended:
  • Open a new part file
  • Change to desired accuracy ( Set Up -> Accuracy -> ...)
  • Import model with menu option Insert -> Data from File.
  • The parameter enable_absolute_accuracy in the config.pro needs to be set to yes if absolute accuracy is needed.
  • A recommended setting of the absolute accuracy is 0.01mm. If the part is not imported correctly, try again by changing the accuracy to 0.02mm and 0.05mm.
  • To import a part (does not work with assemblies) in Pro/ENGINEER 2000i² and Pro/ENGINEER Wildfire with an accuracy other than the default accuracy, the following procedure is recommended:
  • Open a new part file
  • Change to desired accuracy ( Edit -> Set Up -> Accuracy -> ...)
  • To import a part in Creo Parametric with an accuracy other than the default accuracy, the following procedure is recommended:
  • Open a new part file
  • Change to desired accuracy (File -> Prepare -> Model Properties -> ...)
  • Up to Wildfire 3 import model with menu option File -> Import -> Append to model.
  • In Wildfire 4 and higher choose File -> Open and select STEP as type.
  • The parameter enable_absolute_accuracy in the config.pro needs to be set to yes if absolute accuracy is needed.
  • A recommended setting of the absolute accuracy is 0.01mm. If the part is not imported correctly, try again by changing the accuracy to 0.02mm and 0.05mm.
  • If the STEP file contains assembly data, see to it that it is imported as an assembly (otherwise, Pro/ENGINEER gives a warning).
  • Depending on the further usage, hybrid models and multi solids can be imported in part or assembly mode. Part mode allows import with user defined accuracies, in assembly mode all solids/surface can be individually handled.

Pro/ENGINEER / Creo Elements - System

  • Shaded view is helpful for a first impression of the model quality.
  • Highlighted menu option Info -> Geom/Check gives hints about geometric problems of the imported model. In Creo Parametric a similar functionality can be found in File -> Prepare -> ModelCheck Geometry Check
  • The color of the model in wireframe display indicates its type (with Utilities -> Environment -> Colors turned off):
  • yellow for wireframe or surface boundary without connecting surface (might indicate bad areas)
  • If solid/shell cannot be created because of open gaps (look for yellow boundaries!), menu option Feature -> Redefine -> Fix Bndries -> Zip Gaps might help closing those gaps. (use Auto Select for quick help).
  • The Pro/ENGINEER 2001 and Wildfire Interface Guide gives more information.

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