Downloaded from https://www.everyspec.com APPENDIX C MIL-STD-31000A Recommended correction: Remove the tiny entity and extend or trim one or both adjacent surfaces to eliminate the gap. C.7.2.5. Narrow surface or patch (G-SU-NA). Definition: Width of surface or patch, L, is below permissible minimum in any direction. Effects of condition on CAD data quality: Design or drafting: Cross sectional views, fillets, rounds, and offset surfaces may fail. Slight increase in model storage requirements due to unnecessary entities. Data exchange: Faces may not trim properly. Finite element analysis: Unwanted mesh elements may be produced. Automatic mesh generation may fail.
Numerically controlled manufacturing: May slow operations. Tool-path generation may fail. Recommended correction: Remove the narrow surface and extend or trim one or both adjacent surfaces to eliminate the gap. C.7.2.6. Relatively narrow neighboring patches (G-SU-RN). Definition: Ratio of width of surface or patch compared with adjacent patches, r, is below permissible minimum even though the absolute patch dimensions exceed allowable minimums. Measurement: r = width(patch 2)/width(patch 1), r ≤ 1.0 Effects of condition on CAD data quality: Design or drafting: Indicative of poor surface partitioning. Problems modifying surfaces may occur. 94