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I see, the numbers I used to calc were all just hypothetical to get an idea of the effect of varying the blade width and spine thickness. If you multiplied the angles by 2 to get the full angle of...

That's interesting that 18 degrees is the ideal angle, maybe that is why some razors shave better than others not only does the quality of steel matter but also the geometry with which the blade was...

I always remebered tangent as rise over run like slope. That would be opposite / adjacent which is right, if you calculated the adjacent side which would be the length of the bottom of the triangle...

Bad drawings, should've put spine against bottom line (hone) but this is why I divided by 2 hope you get idea.

Actually see your point now though if the bevel angle is calculated using the angle...

Just finished taking Calc I and was thinking about some trig principles today while showering and getting ready to shave. I thougth about honing and realized I could figure out the actual bevel...