Fully-Toleranced Test Cases (FTC)
This dataset includes six FTC (Fully-Toleranced Test Cases) and associated CAD Models. Some of the FTC were not modeled in some of the CAD systems. 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:
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:
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.
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.
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 is not allowed.
Download Free CAD Models, STEP Files, and Test Results
Manufacturing, Interoperability in manufacturing, Manufacturing systems design & analysis and Product data
Created August 29, 2016, Updated May 31, 2019