You may find an adze with good bones but an edge that requires a complete tune-up, like an antique with deep nicks or a new model with subpar bevels.
Sharpening Techniques - FineWoodworking
Tim Manney Chairmaker: Adze Grinding and Sharpening.
Lucky Sod - Jack Lewis
Sharpening an Adze
How to sharpen a blade using a honing guide - FineWoodworking
Workshop Tip: Floor Vise Makes Adze Work Safer and Easier - FineWoodworking
Beautiful Carving Starts with a Keen Edge - FineWoodworking
Sharpening - FineWoodworking
adze A Woodworker's Musings
Adze Grinding and Sharpening. - Tim Manney Chairmaker
How to sharpen an adze - FineWoodworking