The Lie Nielsen honing guide instructions give a list of the projections for bevel angles of 20, 25, 30, … 50 degrees but not a formula for intermediate values or for jaws other than the standard jaws. I took this problem as a challenge and solved it. My question is whether anyone here is interested in my formula or the derivation.

I did a cursory Google search of the internet to see if someone else had reported a formula. I did not find a formula but I did find another forum on which a person asked the if anyone knew the formula (he called it the protrusion). He only got ways to find it by trial and error or measure it with a protractor or angle gauge.

I will take the time to make a drawing and show the math tomorrow if there is any interest.