Polygon turning animation - video

[tonyfoale]

Here is a previous post that goes into detail of how this works. iIn particular on manual lathes. There is also a spread sheet to help with setup for cutting any order of polygon from 3 and up. It also does it for two sides but is that a polygon if joined by two arcs? CNC machines can be programmed to cut flat sides but when done on a manual lathe you have to accept near flat. How close depends on the setup parameters but it can be very close, just not quite exact.

Turning-polygons-on-lathe