Stay with me here. At the end I’ll show how we can do this in only 15 seconds.

To calculate the taper of the blade all we need to know is the thickness of the blade at the spine and the width from spine to edge.

This is the knife from this post: http://bessex.com/forum/showthread.php?t...17#pid5317

The green/blue just shows the blade bisected into two triangles. We know the thickness at the spine and the width from spine to edge. Divide the thickness in half to get ½ the thickness.

Here is the triangle formed by ½ of the bisected blade. Why do this? Because now we have a simple triangle. We know three things: The length of two sides (2.012, 22.999) and one angle 90°. This is cool because we can use SAS (Side Angle Side) calculations to get the length of the hypotenuse and from there the interior angles.

All that’s left to do are some quick and simple mental calculations to determine the taper angle is 5°.

Of course some (most?) blades get thinner at the spine from the handle to the tip. Oh well, other than using a CNC machine with some complicated programming for sharpening, we’ll just have to live with it. Maybe the best thing to do is to pick some mid point and call it good.

As promised, here’s how to do this in 15 seconds! Go to either of these two web sites, select SAS calculation, enter ½ the spine thickness for one side and the width of the blade from spine to edge for the other side and 90° for the angle. Press the GO button. Done.

https://www.triangle-calculator.com/?wha...bmit=Solve

http://www.1728.org/trig4.htm

A Google search turns out many triangle calculators.

See? Easy!

To calculate the taper of the blade all we need to know is the thickness of the blade at the spine and the width from spine to edge.

This is the knife from this post: http://bessex.com/forum/showthread.php?t...17#pid5317

The green/blue just shows the blade bisected into two triangles. We know the thickness at the spine and the width from spine to edge. Divide the thickness in half to get ½ the thickness.

Here is the triangle formed by ½ of the bisected blade. Why do this? Because now we have a simple triangle. We know three things: The length of two sides (2.012, 22.999) and one angle 90°. This is cool because we can use SAS (Side Angle Side) calculations to get the length of the hypotenuse and from there the interior angles.

All that’s left to do are some quick and simple mental calculations to determine the taper angle is 5°.

Of course some (most?) blades get thinner at the spine from the handle to the tip. Oh well, other than using a CNC machine with some complicated programming for sharpening, we’ll just have to live with it. Maybe the best thing to do is to pick some mid point and call it good.

As promised, here’s how to do this in 15 seconds! Go to either of these two web sites, select SAS calculation, enter ½ the spine thickness for one side and the width of the blade from spine to edge for the other side and 90° for the angle. Press the GO button. Done.

https://www.triangle-calculator.com/?wha...bmit=Solve

http://www.1728.org/trig4.htm

A Google search turns out many triangle calculators.

See? Easy!