Downloaded from https://www.everyspec.com APPENDIX C MIL-STD-31000A Finite element analysis: Gaps may occur between mesh elements Numerically controlled manufacturing: Tool-path generation algorithms may produce excessive or insufficient cuts. Recommended correction: Delete the redundant embedded face. C.7.5.8. Inconsistent face on surface (G-FA-IT). Definition: The direction of the face normal vectors is inconsistent with its underlying surface. The criterion is true if the directions are consistent. Some CAD systems don’t assign a normal orientation to faces, so faces and their associated surfaces are always consistent.
The criterion is true if the face and base surface normal vectors are consistent. Effects of condition on CAD data quality: Design and drafting: No effect on quality. Data exchange: Unwanted self-penetration and face degeneration may occur. Faces may not trim properly following translation. Finite element analysis: No effect on FE applications. Numerically controlled manufacturing: No effect. Recommended correction: Reverse the face direction if necessary. 112