Originally Posted by
holli4pirating
This may not contribute much to your calculations, but it looks like you have disregarded the tilt of the razor as it lays on the hone. If you were to put the spine of a razor onto a hone with the spine perpendicular to the hone, as you have drawn it, the edge of the blade would be in the air. To get the edge onto the hone, you have to tilt the razor by some angle. That will affect your "h" and "t" values, and I think it will also affect your "theta" values, since you will have to play with the bevel angle and the tilt angle. Also, as you continue to hone away the blade, the tilt angle will change.
I'm not sure what the easiest set of equations would be to incorporate the tilt, but it seems to me that the tilt angle is a function of "h" and "t."
EDIT: Actually, I think your theta is fine, since that is the bevel angle itself, not the razor angle of the whole razor.