Downloaded from https://www.everyspec.com APPENDIX C MIL-STD-31000A Effects of condition on CAD data quality: Design and drafting: Errors may occur when generating projections, offsets, cross sections, fillets, rounds, and other geometric features. Models may fail unexpectedly. 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:
Assure that correct tolerances are maintained during translation. Adjust tolerances of CAD system (if possible) to maintain allowable tolerances. Revise curves to reduce gap size to allowable maximum. C.7.5.2. Large vertex gap (G-FA-VF). Definition: The distance between a vertex and the corresponding edge end point or face that it trims exceeds the allowable maximum. Effects of condition on CAD data quality: Design and drafting: Errors may occur when generating projections, offsets, cross sections, fillets, rounds, and other geometric features. Models may fail unexpectedly. 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: Assure that correct tolerances are maintained during translation. Adjust tolerances of CAD system (if possible) to maintain allowable tolerances. Project the vertex point on to the curve. 108