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CATIA V4 (T-Systems) >> OneSpace Designer

The following settings are recommended up to CATIA V4.2.5 with COM/STEP 4.3.1.0 and CoCreate Modeling 16.5.

CATIA V4 (T-Systems) - System

  • No elements should be placed in NOSHOW/NOPICK.
  • Model should be cleaned of all unused information, because the translator exports the complete content of CATIA-parts.
    • Delete:
    • Unused DETAILS (in all workspaces) 
    • Unused elements from NOSHOW (in all workspaces)
    • Drawings
  • Update SOLID-M into SOLID-E with CATSOE utility.
  • Perform SOLIDE/UPDATE, also if message UPDATE ALREADY DONE appears. (Regeneration removes inconsistencies.)
  • Generate Volumes from SOLID-E and delete SOLID-E in all workspaces. (Geometry is still exported as a solid in STEP.)
  • Scaled and mirrored dittos (EXPLODE function) should not be used.
  • Before export elements of special CATIA modules (e.g. PIPING, BUILDING DESIGN) need to be converted to STEP conform elements.
  • Use CATCLN.
  • Assembly structures in SETs should be transferred to DETAILS.
  • Link all SETs if possible (SETS -> LINK).
  • Solids/Volumes consisting of separate Bodies should be avoided.
  • Objects used for Boolean operations should show good penetration.

CATIA V4 (T-Systems) - STEP Preprocessor

  • The COM/STEP STEP Processor can be used in batch, interactive and Java mode. The following descriptions refer to the Java GUI.
  • Menu STEP:
    • Select AP214 Version IS
    • Conformance Class: CC2 for geometry and CC20 for drawings
    • Select Product Structure S3: Item_Definition_Structure for assemblies
    • Geometry and topology: select G2, G3 and G5, do not select G4 and G7
  • Menu Conversions 
    • Choose Solid as Target modeling system.
    • INDEX and DATA size should always be set to generous values (50000, 200000).
    • Exporting DETAIL/DITTO creates STEP assemblies with the top level product named after the CATIA model. 

STEP File

  • STEP files using either version (CD or DIS) can be imported.
  • The STEP filename including path should not exceed 41 Characters.
  • The STEP filename should not contain: equal sign (=), colon (:), semicolon (;), asterisk (*), question mark (?), quotation marks (""), or comma(,);
  • There must be no spaces in the STEP filename.
  • The extension *.step of the STEP files must be renamed to *.stp.

OneSpace Designer- STEP Postprocessor

  • The properties for STEP import can be found in the file -> open -> options dialog
  • Set the accuracy to automatic (default) to use the accuracy of the STEP file.
  • If the accuracy is customized, make sure that the accuracy setting is the same or less than the accuracies setting used to generate the part being loaded.
  • When associated messages are returned during the import of the STEP file the accuracy should be adjusted.
  • If a product with multiple bodies is imported, Solid Designer creates an assembly.
  • Blended edges are not recognized as such, and it is not possible to modify blends using standard OneSpace Designer. 
  • The import log file "step_load_log" gives further information.

OneSpace Designer – System

  • Shaded view is helpful and gives a first impression of the model quality.
  • To ensure the model quality is OK a complete model check should be performed.

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