Uneven Bevel

[28gauge]

Been using the Spyderco sharpener for years with good results. Decided to re-profile some of my knives and apply the 30 degree back bevel. Went well on all but one, a custom trout and bird. The bevel on that knife is grossly uneven, mostly at the front sweep of the blade towards the point. Can't figure out why this happened. Measured the angles on the sharpener and they are equal; even turned the sharpener around 180 degrees. Went back and examined the other knives and they look even. Was it my technique on this knife or could there be something off with the basic grind on the knife? Any similar experiences or thoughts?

 

[Medic1210]

The knife was ground unevenly when the primary bevel was set. It's not centered with the midline of the blade.

 

[Jason B.]

A custom knife is usually ground by hand and because of this the sides of the knife may not be as flat and even as they look. Side to side thickness differences in the blade will show during sharpening.

 

[jackknifeh]

If the edge is not in the center of the blade but the angles are the same the width of the bevel will be different on opposite sides of the blade. To fix this may take some time but you will just need to use a lot more strokes on the side with the narrowest bevel. By removing more steel from that side of the blade the edge will gradually "move" to the center of the blade. Then the bevels will be the same width on each side of the blade. That will fix your edge if I understood your description correctly. Good luck.

Jack

 

[Obsessed with Edges]

Uneven bevels will also show up on thinner blades that aren't perfectly straight (bent or curved to one side or the other). Has the same effect as an uneven primary grind. This has shown up on a lot of pocketknives I've sharpened, especially ones with 'krinked' blades (such as the sheepsfoot blade on a stockman). The blade's edge won't lie flush with the stone so, on one side, it ends up with wider bevels near the tip and the ricasso, and narrower in the central portion of the blade. When sharpening the other side, it's just the opposite (wider bevel in the central portion, narrow at the tip & ricasso). The pointy tips of clip blades on pocketknives often tend to be curved/bent a little bit, so the discrepancy usually shows itself near the tip.

 

[bkzk100]

if the grind is un-even, it shows up the most at the front of the blade. as has been the case of some of the hunting knives i have sharpened for guys at my work. and when it shows, it seems as if i can tell that the factory guy is either right or left handed. maybe i need to get a job at case to test this theory. so wudda i know?