Downloaded from https://www.everyspec.com APPENDIX C MIL-STD-31000A Numerically controlled manufacturing: Errors in tool paths may occur. Solid models may not sew properly upon import. Recommended correction: Enlarge or adapt neighboring faces to eliminate the narrow face. C.7.5.5. Narrow region (G-FA-RN). Definition: The distance between the two closest points in a loop or two loops in the same face falls below the allowable minimum. Effects of condition on CAD data quality: Design and drafting: Face definition may be misinterpreted if two or more loops lie too close to one another. Surface offsets, fillets, rounds, cross sections, and other features in proximity to narrow regions may fail.
Data exchange: Faces may not trim properly. Models may fail to sew into solids after translation. Finite element analysis: Mesh generation may fail. Mesh quality may suffer from excessive numbers of elements or distorted elements. Numerically controlled manufacturing: Errors in tool paths may occur. Solid models may not sew properly upon import. Recommended correction: Split the face and delete the narrow region to eliminate the ambiguity among loops. 110