Editing Reuleaux triangle (section)

=== Reaching into corners ===
Several types of machinery take the shape of the Reuleaux triangle, based on its property of being able to rotate within a square.

The [[Watts Brothers Tool Works]] square [[drill bit]] has the shape of a Reuleaux triangle, modified with concavities to form cutting surfaces. When mounted in a special chuck which allows for the bit not having a fixed centre of rotation, it can drill a hole that is nearly square.<ref name="watts">{{citation
|publisher=[[Watts Brothers Tool Works]]
|title=How to drill square hexagon octagon pentagon holes
|location=Wilmerding, Pennsylvania
|year=1950–1951}} (27 page brochure).</ref> Although patented by Henry Watts in 1914, similar drills invented by others were used earlier.<ref name="gardner" /> Other Reuleaux polygons are used to drill pentagonal, hexagonal, and octagonal holes.<ref name="gardner" /><ref name="watts" />

[[Panasonic]]'s RULO [[robotic vacuum cleaner]] has its shape based on the Reuleaux triangle in order to ease cleaning up dust in the corners of rooms.<ref>{{citation|last1=Mochizuki|first1=Takashi|title=Panasonic Rolls Out Triangular Robot Vacuum|url=https://blogs.wsj.com/japanrealtime/2015/01/22/panasonic-rolls-out-triangular-robot-vacuum/|department=Japan Real Time|newspaper=[[Wall Street Journal]]|date=January 22, 2015}}.</ref><ref>{{citation|url=http://www.gizmag.com/panasonic-rulo/36378/|title=Panasonic enters the robo-vac game, with the triangular Rulo|first=Ben|last=Coxworth|date=March 3, 2015|magazine=Gizmag}}.</ref>