What is happening

T

Tar18

Joined
Oct 3, 2012
Messages
144
Hi folks.
I was not sure what the prefix should be in this case so here goes.
I have a CRKT Civet Bowie neck knife which I just love and wear it a lot. The other day I decided to just touch it up (not used much but) and noticed something that I do not understand. On one side of the blade the bevel is, shall I say small, while the other side is bigger. I was touching it up on my SM, it was still pretty sharp, and noticed that the side of the blade that was bigger was starting to get another bevel. Now please excuse me if I got the terms wrong but when I run my finger nail over the bevel I feel a little bump and then when I check it with my loupe I see what appears to be another bevel.
Can someone please explain what I am seeing and feeling and also what should I do to fix it. I have noticed a couple of knives that seem to have a different size bevel on each side. On this knife one side with the small bevel is very sharp while the other side is not as sharp.
I need some help on this one.
Thanks again folks for all of the helpful help.
Regards
Tar :)
 
The angles on your knife are possibly off center, not square and a different angle than whatever setting you're using on the SM. The thin bevel is likely a match, or you'd see another bevel forming at the edge.

The larger bevel that is forming an additional plane is either larger (if the new bevel is forming at the shoulder) or smaller (if the new bevel is forming at the edge).

If it is still sporting the factory edge it would explain a lot. As long as the SM is hitting the apex edge on both sides it will cut fine. To fix it would require the narrow edge be pushed closer to the center line, or if the edge is centered but not square to the spine, a less acute angle will need to the pushed into the wider bevel side, and a more acute angle pushed into the narrow bevel.

Give it a close look edgewise so you can see how the existing bevels mate up and it should become a little more clear.
 
Thank you again heavyhanded. Looking from the butt down the blade, I noticed that the side with the widest bevel I could see it and the side with the small bevel, I could not see. I hope that I am understanding that part as you explained. Sorry but not understanding fully what you said about pushing the narrow edge. And then the wider edge.
What would I do to go about doing what you said to do.
Thanks for being patient.
Regards
Tar :)
 
Not being able to see the edge in person, I'll try to explain a little more clearly.

First, as you look at the edge, imagine a perfect bevel meeting at the midpoint of the edge, superimposed over the existing edge. Look at the tip as well.

If one bevel is larger than the other, there can only be two possibilities.

First - the edge is formed nice and square to the blade, but is pushed off center. In that case you'd "push" the smaller bevel toward the center to even it out.

The second is the edge is not evenly formed side to side - the cutting edge is tilted relative to the center. In that case you'd want to "push" the wider bevel starting at the cutting edge, and the thinner bevel "pushed" starting from the shoulder. The thicker bevel will be more acute compared to the centerline and need to be reduced, the thinner bevel will be more broad and need to be made more acute.

Both of these methods will need good angle control and a coarse abrasive. You could always sharpen the existing edges and not worry about it.
 
Thanks Heavyhanded for your comments. I will go now and see if I can get them even.
Regards
Tar :)
 
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