Rough Shaping

To reveal a didgeridoo that's hiding inside of a log, there are several effective tools for removing excess wood. My favorites are the band saw, spoke shave, draw knife, and planer. In my process, shaping the outside of a didgeridoo is synonymous with shaping the inside, since eventually wall thickness will be consistent. 

I usually start with logs that already have a maximum diameter appropriate for a bell, and this makes for a good starting reference point. depending on the size and shape of a log, I will go different directions with the overall taper. Generally speaking, most of my didgeridoos have relatively consistent tapers from the mouthpiece to the bell end. 

Considering the physics of sound, changing the ratios of bore diameters along the length of a didgeridoo effect relationships of internal resonances and pressures, and are directly revealed in its playing characteristics.