Downloaded from https://www.everyspec.com APPENDIX C MIL-STD-31000A Numerically Controlled Manufacturing (NC Manufacturing). The use of a digital code to drive the position and speed of an automated manufacturing machine such as a mill, lathe, router, or flame- or laser-cutter. Offset. A curve or surface that is separated from another curve or surface by a constant normal distance. Overall Extent. Length of the diagonal of a box bounding any 3D object. Overlap. A condition in which two geometric entities (curves, surfaces, edges, faces, or shells) occupy a portion of the same space. Parameter. A mathematical variable. Patch. The fundamental element of a surface.
Patches are the three-dimensional analogs of splines, which can be connected end-to-end to form a curve. In like fashion, multiple patches can be combined to form a larger surface. Planar Curve. A curve lying on a plane. Plane. A surface in which a straight line joining any two points lies entirely on the surface. Polynomial. An algebraic sum of terms whose factors are either constants or positive (or zero) integral powers of the variables. Precision. The number of digits (decimal or binary) used to store coordinates and other numerical data in 3D models. Product Data Management (PDM) System.
A database system that controls access to 3D engineering models and other product data, including approvals, release levels, and non-graphic attributes. Product Data Quality (PDQ). Synonymous with 3d model data validation. Round. A rounded shape connecting two surfaces which join at an angle greater than 180 degrees to prevent the occurrence of a sharp (non-tangent) edge. The cross-section of the fillet may be a single radius, a conic or other smooth shape with ends tangent to the connecting surfaces. 62