Definition
A long, narrow groove or channel cut into the surface of a tool, fastener, or structural part. On cutting tools such as drills, taps, and reamers, flutes provide cutting edges and allow chips and coolant to escape from the work. On other parts, flutes may be used to reduce weight, increase rigidity, or guide fluid flow.
Plain English
A groove or channel cut along the length of a tool or part. On a drill bit, the flutes are the spiral grooves that let the metal shavings escape as you drill.
Context Anchor
Seen in aircraft structure fabrication and repair, especially when shaping ribs, frames, or other thin metal parts.
Derivation
From the Old French flaute, meaning the musical instrument, which has long hollow channels along its body. The shop term borrows that image: a long, narrow groove cut into the side of a tool.
Why Pilots Care
A properly made flute helps a structural part fit without extra stress or waviness. Poor shaping can leave a part distorted or harder to inspect and repair correctly.
Intuition Check
Flute does not mean the musical instrument here. In this context, it means a small groove or shaped wrinkle made in sheet metal.
Example Sentence 1
The mechanic cleaned the flutes of the drill bit to keep metal chips from clogging the hole.
Example Sentence 2
Flutes were formed in the trailing edge of the elevator skin before riveting.