Kitchen knife with a knife how to open angle is how much tolerance
17 degrees: General knife or razor sharp blade angle, but the continuing poor.20 degrees: can provide a very sharp blade, a knife or need to use a very sharp knife.
Why make so complicated, knife and whetstone parallel or ninety degrees, how do you want to grind
25 degrees: both the sharp blade and persistent edge angle. General field knife for this angle.30 degrees: bayonet or knife used in the field, not variable blunt, easy to grind is its advantages
