Downloaded from https://www.everyspec.com APPENDIX C MIL-STD-31000A C.7.1.11. Small radius of curvature (G-CU-CR). Definition: Radius of curvature is below acceptable limits. Effects of condition on CAD data quality: Design and drafting: Except for certain applications (such as sheet-metal hems), small radii of curvature are undesirable. Self-intersecting curves may be created when offset curves are produced. Fillets and rounds may fail. Data exchange: faces may not trim properly. Finite element analysis: Small radii produce excessive numbers of elements. Numerically controlled manufacturing: Small tools are required to mill small radii. Recommended correction:
Replace curve segments that have less than the minimum acceptable radius. C.7.2. Surface criteria. C.7.2.1. Large gap between surfaces or patches (G 0 discontinuity) (G-SU-LG). Definition: Excessive distance between the common boundary between surfaces or patches Measurement: gap width in mm Effects of condition on CAD data quality: Design and drafting: Surfaces may not combine to produce a solid model Data exchange: faces may not trim properly. Finite element analysis: Mesh algorithms may fail or produce excessive numbers of elements. Numerically controlled manufacturing: Tool path software may fail. Tool paths may gouge the work piece. Recommended correction:
Extend and trim one or both surfaces to reduce the maximum gap width. 91