Downloaded from https://www.everyspec.com APPENDIX C MIL-STD-31000A C.7.5.9. Multi-region surface (G-FA-MU). Definition: The number of faces, N, associated with a single base surface. Effects of condition on CAD data quality: Design and drafting: No effect on quality if the CAD system supports multiple faces on a surface. May cause confusion when the base surface is modified. Data exchange: May cause errors if the receiving system does not support multi-region surfaces. Finite element analysis: No effect on FE applications if multi-region surfaces are supported. Numerically controlled manufacturing: No effect if multi-region surfaces are supported. Recommended correction:
Divide base surfaces so that the value of all multi-regions is 1. C.7.5.10 Large Round Faces (G-FA-LS) Definition: A set of connected faces are defined on a surface with an extremely large radius of curvature. Measurement: Largest radius of curvature in either parametric direction along the underlying surface. Does not apply to faces defined on a plane. Effects of condition on CAD data quality for manufacturing: Some material removal machining processes are unable to accurately produce geometry with a large radius of curvature, thereby requiring a process which is more complex and expensive. Recommended correction: Recreate these faces using a planar geometric definition. 113