Edge Angle, Angle Guide, and Blade Body Angle

[blgentry]

With a blade that only has one body bevel, measurements and trig will probably get you close.  But with blades like the Cold Steel Recon Tanto, or similar blades, it's harder.

Because the body near the spine is flat stock.  But just forward of that is the angled part of the blade.  ...and when you press the angled part into your rest, or table, it lifts and tilts the spine of the blade.  Which means you'd need to measure it's height at this point, or measure at the start of the angled part or something.

All of which to say:  It's much, much easier to stick an angle cube to the blade, press it down and look at the angle.  After zeroing it on the table first of course.

Brian.