Fanfacing

Fanfacing is a term used in several technical disciplines to describe a method of shaping or finishing an edge or surface so that it opens out in a fan-like pattern from a central point or axis. The term derives from the visual similarity to a handheld folding fan, with radiating surfaces or facets arranged around a core.

In machining and metalworking, fan-facing may denote a finishing operation on circular parts where the outer surface or a marginal edge is produced with a series of shallow, radial facets. This creates a segmented edge that can improve seating of mating parts, reduce burr formation, and distribute stress more evenly around a flange or hub.

In decorative metalwork and woodworking, fan-facing refers to a stylistic edge treatment in which the edge is faceted into multiple radial planes. The technique can produce a textured or catching surface and is chosen for visual interest or tactile feel rather than strict dimensional function.

In ventilation and blade-design contexts, fan facing appears in descriptions of how blades or fins are arranged around a central hub to direct or diffuse airflow. In such uses, the term emphasizes the radial layout and the way the features radiate outward, rather than a single flat plane.

Techniques commonly involve indexing the workpiece to set equal angular spacing, use of stepped or faceted tools, and careful control of feed rates and cutting depth to achieve uniform facets while avoiding surface damage. Quality considerations include edge integrity, dimensional tolerance, and surface finish.

Variants of fan-facing include radial faceting, segmented facings, and decorative fan-edge finishes. While not universally standardized, the concept serves practical or aesthetic purposes across manufacturing, design, and craft disciplines.

See also: facing, milling, turbine blade manufacturing, fan (engineering).