Primary Edge on Caly ZDP

[tim8557]

In the reviews section, Sal Glesser states that his testing machine shows the primary angle on this knife to be 12 degrees INCLUSIVE. Does this mean 6 degrees per side? Is that unreal?

 

[Sword and Shield]

Not unreal at all. Most of my hand-sharpened knives top out at 20 inclusive, so 12 is not abnormal, if cutting is your goal.

 

[tim8557]

Its interesting that Spyderco, at least with their Sharpamker, suggests that the best edge (primary) is 40 degrees INCLUSIVE. I wonder why they then produce a knife that is 12 degrees. The Sharpmaker will only dull it (that may be piss poor grammar).

 

[Andy_L]

I thought that the 12degree inclusive would be the primary grind angle and not the one that forms the edge.

 

[Cliff Stamp]

I wonder why they then produce a knife that is 12 degrees. The Sharpmaker will only dull it (that may be piss poor grammar).

The lower initial edge angle will raise ease of sharpening and cutting ability. The ZDP-189 at ~64 HRC is also probably more of a focused knife like say the FRN Endura so it would have a reduced edge profile.

-Cliff

 

[tim8557]

I thought that the 12degree inclusive would be the primary grind angle and not the one that forms the edge.

I always thought that "primary angle" was the angle that formed the edge; hence "primary". I also thought, that "Seconday Angle" was the reprofiling angle.

Maybe I'm all wrong in my use of terminology. Afterall, I'm still stumblin' over "acute" and "obtuse"!

 

[Grover_Cephas]

We have a few misunderstandings of terms here.

There are three "bevels" being talked about:

1-The sides of the blade (the "full flat ground" part)
2-The cutting edge
3-And the bevel formed when you sharpen at a steeper angle to ease future sharpening (what Spyderco calls the "back bevel")

I dunno which is meant by "primary bevel", though.