Differential Sharpening

O

old4570

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Jul 28, 2010
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A concept I have heard off , but not as yet tried ..
One of these days one must try out various concepts on a known repeatable knife !
 
I've been aware of this concept for a bit now but have yet to try it out on any of my knives. I am very curious about it so I'll most likely give it a shot in the near future.
 
I suspect that it's creating an effect similar to how struck-in serrations were done on sickles back in the day where serrations were struck into an edge on one side with a chisel-like tool and then sharpened only from the backside, which allowed it to polish all the way into the insides of the serrations. On a macro scale this does often lead to a slight burr on the edge but on a micro scale may not be as much of an issue since the coarse stone is able to re-cut the teeth fresh as it were.
 
I've done it with a venev f400 n f1200. I can get a shaving edge without stropping with those grits. I want to try some combos with 240 n 800/2k. It's a different grit rating than I've seen used in videos. The 400 n 1200 combo seems to work pretty good. On the same knife it seems to last longer and come back easier with a quick strop. I always go up to my finest stone on both sides. I'll do a couple passes with the coarse at a time. Double the passes with the fine on the other side. Switch back n forth until I like the coarse scratch pattern. I use a convex adapter on a guided system n don't normally run the coarse pattern all the way up the bevel. Finish with the fine and do one or two passes on both sides with it. Really light on the apex of the coarse side with the last passes n make sure I don't change the scratch pattern. I stumbled on home slice this am with the magnacut vid too. From what I'm seeing I might be getting some of the benefits from this style but I may be able to get more. He has a video that shows under a microscope whats happening.

 
scienceofsharp.com

Dual Grit Sharpening

A few months ago, a video was posted by Pete Colligan on his Cedric & Ada YouTube channel demonstrating the enhancement in edge retention of a knife sharpened by a novel technique, where one si…
scienceofsharp.com scienceofsharp.com
 
You can't argue with the results ... at least when it comes to cutting rope. Seems to be creating an edge that lasts around twice as long as a similar blade sharpened normally.

I'd be curious to see how it performs cutting something like cardboard.
 
The magnacut in the video above out cut tungsten carbide. The one I posted shows the edge under an sem. The coarse stone makes a decent bur and the fine straightens and polishes it. I liked the idea of micro serrations better. It was hard for me to tell in the vid but dude says the bur is coming straight out from where a normal apex would be. So super fine bur that makes a self healing edge until it gets back to the apex. I still liked micro serrated edge that lasts longer. Not sure how to feel about the bur thing. I want to try to finish some more closer to how home slice does it.
 
And , how would that sharpening method work with other steels .. ? ( Would the bur Roll ? ) Or is it only good for the top of the food chain steel ?
 
old4570 said:
And , how would that sharpening method work with other steels .. ? ( Would the bur Roll ? ) Or is it only good for the top of the food chain steel ?
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My guess is that it will work best on high wear resistant, high toughness steels, but I could be totally wrong lol. It looks like to get the most out of the dual grit edge, the burr needs to hang onto the apex for as long as possible.
 
Pete's had good look with one of the numbers cr numbers steels. So not top teir super steel. I think maxamet or Rex 45 didn't do good with it.
 
Is there a test out there that shows a differentially sharpened blade lasting longer in a cut test than if the blade was just sharpened on the coarser stone?
 
Short answer is yes. Best answer is it depends on how that steel takes this edge. It's not just about being a super steel. In some that I've seen Pete will test different finishes on the same knife. I think thats what I've seen him called. He cuts rope n I wonder if he knows in total weight how much rope hes cut. I don't get it tho. Why is pete using cedric and adas youtube channel? Does anyone even know if cedric and ada are ok?
 
stonemedusa6264 said:
Short answer is yes. Best answer is it depends on how that steel takes this edge. It's not just about being a super steel. In some that I've seen Pete will test different finishes on the same knife. I think thats what I've seen him called. He cuts rope n I wonder if he knows in total weight how much rope hes cut. I don't get it tho. Why is pete using cedric and adas youtube channel? Does anyone even know if cedric and ada are ok?
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It's Pete's channel, and Cedric and Ada were his dogs whom he named the channel after. They have both passed sadly and he considered changing the name of the channel but I suppose he has decided to keep it in their memory.
 
stonemedusa6264 said:
Short answer is yes. Best answer is it depends on how that steel takes this edge. It's not just about being a super steel. In some that I've seen Pete will test different finishes on the same knife. I think thats what I've seen him called. He cuts rope n I wonder if he knows in total weight how much rope hes cut. I don't get it tho. Why is pete using cedric and adas youtube channel? Does anyone even know if cedric and ada are ok?
Click to expand...
Thank you. Do you have a link?
 
I was multi tasking the other morning n listening. Not looking through all the videos of him cutting rope again, but it's the channel that has the first vid on this thread. The second vid is the dude who came up with this. This one was easy to find n is the first one pete did that mentions this technique. I think most of them after that he does with different finishes if they are his.

 
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