Convexed Composite Blade Leek

Joined
Feb 15, 2003
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The Composite Blade Leek is flat ground (the regular Leeks are hollow ground) - on my sample the blade is rather thick toward the bevel/cutting edge.

Please see review - Kershaw Composite Blade Leek

So I decided to put convexed edge on the blade - by honing away the distinctive transition step/corner between the blade face and the edge bevel.

Please also see - Convexed Edge where I put this edge on a SAK.

I used an EZE Lap fine diamond hone to work the bevel using a rolling motion, but concentrating mainly on getting rid of that step/corner to the edge bevel.

Because the looks is one of the main attractions of this CB Leek - I protected the face of the blade with some Scotch tape - exposing about 1/8" at the edge - that way I can almost lay the blade face flat on the hone without marring the finish.

The edge part of the composite blade is CPM-D2 - and D2 is a hard tool steel I was expecting some hard work - but was very surprised by how quickly I was able to cut in the new convexed bevel.

I was able to feel the burr on the edge - and went to finish the blade on a pair of fine ceramic crock sticks for the final micro bevel edge. The blade certainly felt sharp on slicing paper.

On examining the blade edge under a 30x illuminated microscope I found that I had retained most of the original bevel on one side of the blade, really only removing the step/corner to that bevel - and to my surprise I saw fold-over at some parts of the edge - surprised because D2 is supposed to be pretty crisp when hard, and resists fold-overs.

I worked more on that side of the blade and honed more away - so that under magnification almost all the bevel is now newly honed. Again finishing with crock sticks for the final micro bevel edge - this time under the microscope I did not see any fold-over.

the legend side was where I initially only partially put a convexed edge on the blade leaving some of the original bevel - and perhaps that was some of the reason why there was some fold-over after using the crock sticks.
cbLeekBld2h.jpg
cbLeekBld2t.jpg

this is the current state of the edge after I worked more to fully hone the bevel to a convexed one.

cbLeekBldt.jpg
cbLeekBldh.jpg

this side is neater since it was the easier side for me being right-handed.

Pinching the blade and pulling toward the edge the step/corner to the bevel is now more or less seamless, the transition is now very smooth and I can feel that the bevel is now convex (apple seed shaped cross-section).

The blade now cuts through better having much less resistance at the bevel transition to the face.

--
Vincent
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Nice convexing there, Vincent. I tried doing the same to mine but badly scratched the legended side. Did you get the JYD2 CB ?
 
I tried doing the same to mine but badly scratched the legended side.

Many thanks for your kind words.

Being the cautious type - I (scotch) taped the blade face - exposing only about 1/8" toward the edge - that way I can lay the blade face (buffered by tape) flat on the stone - to best blend the shoulder/corner to the face.

But as you see on the second photo (tip) there appears to be an "Ooops" where my honing went further up the face - however I think there is a slight thicker/raised part there - since the hone is flat, the honing went further up - but it's only "cosmetic" and doesn't really affect anything.

Might want to check out the conversation over at Knife Reviews & Testing in -
Kershaw Composite Blade Leek
where Vivi questioned my honing may have left parts of the factory edge. This shows the limitation of photos which can only show one viewpoint, angle. Those photos were done to emphasize the convexity which then may have missed some of the other aspects. I posted more photos which show the honing better, but does not show the convex aspect that well......

Here's a Before/After (composite) photo -
cbLeekCvxBfrAft.jpg


--
Vincent
http://picasaweb.com/UnknownVincent
http://UnknownVincent.Shutterfly.com
http://UnknownVT.Shutterfly.com
http://clik.to/UnknownVincent
 
The blade now cuts through better having much less resistance at the bevel transition to the face.

Here's an ad-hoc test showing the improvement -
I compared cutting corrugated cardboard against the 13C26 Leek and the RAM both of which I have praised for having much thinner hollow grinds without too much widening/thickening toward the edge.

My previous comparison of the Composite Blade Leek with the factory edge matched the older 440A Leek which has a thicker hollow grind and distinctive widening/thickening toward the edge, but was out cut by the 13C26 Leek - see Post #5 in Kershaw Composite Blade Leek.

cbLeekCdbdCut.jpg


This time the convexed CB Leek out cut the 13C26 Leek - and I used the 13C26 Leek twice to make sure the first cut wasn't sub-par. The convexed CB Leek also just out cut the RAM.

--
Vincent
http://picasaweb.com/UnknownVincent
http://UnknownVincent.Shutterfly.com
http://UnknownVT.Shutterfly.com
http://clik.to/UnknownVincent
 
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