Each manufacturer has its own way of making flutes, but there are many similarities among them. Below is a selection of videos from some major manufacturers.
How It’s Made is a documentary television series that premiered on January 6, 2001, on the Discovery Channel in Canada and on Science Channel in the United States.
In Season 5, Episode 6 (Episode 58), aired on October 11, 2005, the show featured how a Brannen flute is made.
Of course, each manufacturer has its unique processes, but the overall methods are quite similar.
Flute and Piccolo Finishing