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Ivo - no, no, not an insult! Maybe it's just how we learned it in Australia, but SOHCAHTOA is an acronym for remembering the definitions of sin, cos and tan using a right-angled triangle.

Sin -...

OK, I get it - it is the hypotenuse (sorry). Would you generally verify the assumption of equal angle (in case of uneven hone wear)? Or is this usually minor?

SOHCAHTOA, Ivo!

Mparker,

Sorry, I'm confused:

I'm not completely sure what the definition of the angle of a blade is - is it 2a? From the way your ascii art is drawn, I guess it is.

Another question: if...