Queston about "How to Make the Benchmade Axis Perform" by Joe Talmadge

[desertguy88]

In this article, the author uses a Spyderco 204 sharpener and makes references to the 20 degree and 15 degree slots.

http://www.bladeforums.com/features/makeaxisperform.shtml

I have a 204 and there are no 20 or 15 degree slots. There are 30, 40 and 12.5 degree slots.

So what's he talking about!!??? Has the 204 changed since the article was written?

 

[cmd]

Correct me if I'm wrong, but I think

40 degrees included (spyderco markings) is 20
30 degrees included (spyderco markings) is 15

 

[GarageBoy]

well, 30/40 degrees is inclusive. The 12.5 is for scissors

 

[Architect]

20 x 2 = 40

15 x 2 = 30

Joe bypassed an expanation of the "included" angle in his article.

Spyderco labelled the 204 with the "included" angle of both stones (see math above) rather than the angle for each bevel (as Joe explains it).

The angle of each individual stone is as indicated in Joe's article.

 

[desertguy88]

20 x 2 = 40

15 x 2 = 30

Joe bypassed an expanation of the "included" angle in his article.

Spyderco labelled the 204 with the "included" angle of both stones (see math above) rather than the angle for each bevel (as Joe explains it).

The angle of each individual stone is as indicated in Joe's article.

Forgive me, I'm a newbie. What does the "included" angle mean?
Are you trying to say that when he refers to the 15 degree slot I should use the slot labelled 30, and when he refers to the 20 degree slot I should use the one labelled 40?

 

[patrickb]

Are you trying to say that when he refers to the 15 degree slot I should use the slot labelled 30, and when he refers to the 20 degree slot I should use the one labelled 40?

Yes, that's exactly what he means.

 

[Jeff Clark]

Sharpmaker rods are tilted slightly away from vertical. When you put a rod in a 30-degree slot it is tilted 15 degrees from vertical. When you hone opposite sides of a blade at 15 degrees you get an edge that meets at an angle of 30 degrees from one side of the bevel to the other side of the bevel. This is the "included angle", the angle that is included between the sides of the angle. So included angle is twice the "honing angle", which is the angle between the surface of the hone and the centerline of the blade while you are honing. When you are sharpening a knife it is more common to talk about the honing angle.