How relevant is the bore size to the key (scale) the flute is being created to play?
Bore sizes are critical! Take for example an F# flute. This tuning requires a fundamental note of F#4 up to at least the highest note of its basic or primary note of G5. Whereas a 7/8th inch bore will basically suit the fundamental F#4 a more appropriate bore size for the G5 is 3/4 of an inch. In this instance a bore size needs to be used that will accommodate both the F#4 and the G5 perfectly. In order to do this the flute maker needs to calculate a bore size that will accommodate both the F#4 and the G5 as well as higher notes that can be played by a quality 1.4 octave flute. In such an instance a realistic bore size will be between 7/8ths (.875) of an inch and 3/4 (.750) of an inch. A bore size of .8043 is calculated to be the most suitable. Creating a flute with an accurate bore size of .8043 requires the flute body to be created in two halves so that the routed bore can be accurately established. No drill manufacturing company creates a standard .8043 drill bit so creating a flute
