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Featured Comment by Charles Sample on January 24, 2016 at 22:59

Yep, Stephen, ever chance I get!  LOL  But it sure is sweet when one of my knives just glides through what ever it is I am cutting!

Comment by Stephen L. Corley on January 24, 2016 at 22:06

Charles, that's cheating. lol 

Featured Comment by Charles Sample on January 24, 2016 at 19:18

I have never been able to sharpen a knife free hand.  Maybe if I had put in hours upon hours of practice I could have learned.  However I just don't have that kind of patience.  I used a Smith's handheld two sided pull through sharpener to keep my EDC pocket knife reasonably sharp.  However as I began to acquire more and better knives such as a set of Case kitchen knives for my wife and my Colonial Bushcraft knife, I needed something better.  After much study and research I ordered a KME Sharpening System.  As a first test of it and me, I tried it out on an old cheap nothing very dull Chinese knife.  I was able to get that knife hair shaving sharp.  I've since used it to get several knives hair shaving sharp, including a couple of my wife's Case kitchen knives, my custom knife of 01 tool steel, my daughter's Colt pocket knife, and lastly just yesterday both of my Rough Rider EDC knives of 440A stainless.

So however long I go between sharpening, I'm sure I will be able to make  a knife hair shaving sharp.

Comment by John A Smithers on January 24, 2016 at 14:19

Hi all!  I have about 10 blades.  I keep 6 very sharp by taking them to a sharpener company down the street.  I asked for and got a Spyderco Sharpmaker.  I am interested to learn more about blade angles and how to sharpen hard steels. 

Comment by Stephen L. Corley on January 24, 2016 at 3:39

The great thing about using super steels is you only have to sharpen them every 6 months. The draw back is, after 6 months of not sharpening a knife that perfect edge is rather elusive. 

Comment by John Bamford on January 4, 2016 at 11:51

Great information Thomas , thanks .

Comment by J.J. Smith III on January 4, 2016 at 11:18

Well done, John.

Comment by Thomas Lofvenmark on January 4, 2016 at 9:17

About sharpening edges.

When you use a sharpening tool where the blade are fixed in its position in the tool, clamped or fixed with the help of magnets, the straight part of the edge will get exactly the same edge angle all along the straight part of the edge. Also on very long blades.

(This was hard for me to understand - but sharpening tools work like this - all of them - if the blade are fixed in the tool).

When the sharpener come to the belly - the angle will change. This change will be small if you position the blade so that the distance between the edge and the pivot point are the same on the belly as it is in the tools length axel. This means that a long blade shall be fixed in its position with the belly closer to the clamp. Normally people clamp their blades on the middle of the blade. That is wrong.

Also in this position will the straight part of the edge will get the same edge angle (also on long blades) - and the belly will get close to the same edge angle with in +/- 0,1 degrees.

So, forget the myth that the angle, on the straight part of the edge, will change when you grind diagonal to reach the ends of the straight parts when you use a shapening tool, it will not, :)

Thomas

Comment by Thomas Lofvenmark on January 4, 2016 at 8:29

Howard,

Carpenter axes have flat edgeangle low degrees. Felling axes have convex edes of a reason. If you try ro chop a tree with a carpenter axe - the axe will fasten in the tree - ans you have a small hell to get it out again,Mathias becouse that the axe have become a vedge.
Carpenter axes works along the wood fibers.


Felling axes shall work across the wood fibers.
That is why felling axes have convex edge - and the convex edge shall have a very specific convex sphere. Isbthe xonvex sphere ro small - the axe fasten in the tree...
Ifvthe convex sphere is to big - the axe will only bounce at the tree and dont penetrate the wood.

When the xonvex sphere is perfect the axe will go in deep innthe wood - and bounce out again. You can use a rytm and the work are easy to so.

The convex edge is not stronger then a straight edge with the same edge angle. But a straight edge and a convex edge behavies differently in the same material. Especially in wood.

Thomas

Comment by Howard P Reynolds on January 4, 2016 at 7:05

Thomas,

Thank you for the overview.  I agree that there are no bad edges, just that some are better for some tasks than others.  Convex edges are great for axes, hatchets, and knives that do some chopping because a convex edge is the strongest edge for hard work.  But, as you say, a flat grind is better for whittling or other tasks.

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