Editing Engine turning (section)

== Description ==
Engine turning is a form of ornamental turning.<ref name=":0">{{cite web |title=Engine Turning vs. Spotting |url=https://www.circuitousroot.com/artifice/machine-shop/surface-finishing/engine-turning-vs-spotting/index.html |website=Circuitous Root}}</ref> The technique geometrically applies a single-point cutting tool to produce a decorative metal surface finish pattern.<ref name=":0" /><ref name=":1">{{Cite web |title=General Descriptions and Basic Sources (for Ornamental Turning and Straight-Line Work) |url=https://www.circuitousroot.com/artifice/machine-shop/ornamental-turning/general/index.html |access-date=2023-12-13 |website=www.circuitousroot.com}}</ref>

Traditionally, engine turning referred to [[Guilloché]] engraving.<ref name=":2">{{cite web |last=Warfield |first=Bob |date=18 July 2017 |title=Guilloche, Rose Engines, Jeweling, & Engine Turning for Artistic Machining |url=https://www.cnccookbook.com/guilloche-rose-engines-jeweling-engine-turning-artistic-machining/ |website=CNCCookbook}}</ref> In the 20th century, it also came to refer to the different process of ''{{Lang|fr|[[Perlée]]}}'' (also known as spotting, jewelling''',''' perlage), which is a fine [[geometry|geometric]] pattern of overlapping circles abraded onto the surface.<ref name=":2" />

=== Equipment ===
[[Guilloché]] engine turning may be done with various machines, including [[Rose engine lathe|rose engines]], [[Straight line engine turning|straight-line engines]], [[Brocade|brocade engines]], and [[Ornamental turning|ornamental turning lathes]].<ref name=":0" /><ref name=":1" /> Perlage uses an abrasive rotating disk or [[dowel]].<ref name=":0" />

=== Material ===
[[Aluminium]] is often the metal chosen to decorate with jewelling, but any appropriate{{Clarify|reason=What makes a surface appropriate for engine turning?|date=December 2023}} surface can be finely [[Manufacturing|machined]] to produce intricate repetitive [[pattern]]s that offer reflective interest and fine detail.<ref name=":0" /><ref>{{cite web |title=Eamonn Keogh's Engine Turning Page |url=https://www.cs.ucr.edu/~eamonn/et/et.htm |website=Computer Science and Engineering - University of California, Riverside}}</ref><ref name=":2" />