Parting Line
A line on a pattern or casting corresponding to the separation between the cope and drag portions of a sand mold. A condition unique to stepped extrusions where more than on e cross section exists in the same extruded shape. A stepped shape uses a split die for the minor or small cross section and after its removal, another die behind it for the major configuration. Slightly raised fins can appear on that portion of the shape where the two dies meet . See also ?Profile, Stepped Extruded?.
