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Download Free CAD Models, STEP Files, and Test Results

Click here to download all of the files

  • CAD models and PDF drawings for all Test Cases. Browse the Test Cases
  • STEP AP203 files for all Test Case geometry without PMI annotations.
  • STEP AP203 and AP242 files with PMI annotations, generated from the CTC and FTC CAD Models. All of the files have graphic PMI and all but one of the AP242 files have semantic PMI, which your CAD software or STEP viewer might not support. See the Implementation Coverage matrix.
  • Use the STEP File Analyzer and Viewer to automatically check the PMI in a STEP AP242 file generated from any of the CAD models
  • Only the CAD models generated in older versions of the CAD systems (indicated by the * below) were verified as part of the testing project
    • CAD models from newer versions of the CAD systems might have had some verification but not as complete as during the testing project
    • The CAD models from Autodesk Inventor were not part of the testing project
  • These files can be used to test Model-based Design (MBD) and Model-based Engineering (MBE) workflows.

Fully-Toleranced Test Cases (FTC)

This dataset includes six FTC (Fully-Toleranced Test Cases) and associated CAD Models. Click on the headings for 2D drawings of each test case. FTC 07, 08, 09, and 10 fit together in an assembly. The FTC have been modeled in five CAD systems:

  • Dassault Systemes CATIA V5-6R2014* and CATIA V5-6R2016, V5-6R2019
  • PTC Creo 3* and Creo 4
  • Siemens NX 9* and NX 11, 12
  • Dassault Systemes SolidWorks 2015* and SolidWorks MBD 2018
  • Autodesk Inventor 2018, 2019
FTC-06

PMI Validation Fully-toleranced Test Case 6

FTC-07

PMI Validation Fully-toleranced Test Case 7

FTC-08

PMI Validation Fully-toleranced Test Case 8

FTC-09

PMI Validation Fully-toleranced Test Case 9

FTC-10

PMI Validation Fully-toleranced Test Case 10

FTC-11

PMI Validation Fully-toleranced Test Case 11

Combined Test Cases (CTC)

This dataset includes five CTC (Combined/Complex Test Cases) and associated CAD Models. Click on the headings for 2D drawings of each test case. CTC 02 and 04 fit together in an assembly. The CTC Test Cases have been modeled in five CAD systems:

  • Dassault Systemes CATIA V5 R21* and CATIA V5-6R2016, V5-6R2019
  • PTC Creo 2* and Creo 4
  • Siemens NX 8 *and NX 11, 12
  • Dassault Systemes SolidWorks 2012* and SolidWorks MBD 2018
  • Autodesk Inventor 2018, 2019
CTC-01

PMI Validation Complex Test Case 1

CTC-02

PMI Validation Complex Test Case 2

CTC-03

PMI Validation Complex Test Case 3

CTC-04

PMI Validation Complex Test Case 4

CTC-05

PMI Validation Complex Test Case 5

Test Results

The verification and validation results measure PMI implementation capabilities in CAD software and derivative STEP, JT, and 3D PDF files. The results are based on the test case specifications, CAD modeling methods, versions of CAD software, and comparison methodologies. PMI representation and presentation are evaluated by many verification characteristics and validation issues. The results may identify issues relevant to your use cases for downstream automated-consumption of PMI representation or human-interpretation of PMI presentation.

To test how well your CAD system implements STEP AP242 PMI, open one of the CAD models, export an AP242 file with PMI and process it with the STEP File Analyzer. The STEP File Analyzer results will indicate how well the AP242 PMI matches the expected PMI in the test case definition. Differences might due to how some PMI was modeled in the CAD system or how the PMI was exported to the STEP file.

Other Data and Testing

CAD models and associated files from the Design to Manufacturing and Inspection (D2MI) project are included with the download of the two datasets.

Design, Manufacturing, and Inspection Data for a Box Assembly

The MBE Demonstrator Reference Model contains CAD models and STEP files for an airplane

AFNeT STEP AP242 Benchmark Testing is a European project that is testing AP242 with a larger set of models, a different set of CAD software, and a different test methodology and criteria.

Enabling the Digital Thread for Smart Manufacturing

Disclaimers

NIST Disclaimer, NIST License

The test cases are not intended to represent best practice in how to apply GD&T to a part. Simpler GD&T strategies could have been used. The test cases are intended to exercise valid presentations of GD&T defined in the ASME Y14 standards.

The test cases, CAD models, and STEP files can be used without any restrictions. Their use in other software or hardware products does not imply a recommendation or endorsement of those products by NIST.

The verification and validation testing results related to the test case PMI were generated based on older versions of the CAD systems. Issues identified for the semantic and graphic representation of PMI in each CAD system may have been (and hopefully have been) resolved since the original testing took place.

We would appreciate acknowledgement if any of the test cases, CAD models, STEP files, or screenshots of the models are used, however, the use of the NIST logo seen at the top of this page is not allowed in promotional materials.

Contacts

Created August 29, 2016, Updated August 5, 2020