CPM154 Sharpening Experience.

harrymole

harrymole

Joined
Sep 1, 2004
Messages
377
I just received a Spec Bump in trade this is the "1 of 500 FPR" it has the CPM154 steel blade. I spent 2 hrs re-profiling the edge to 25 degrees on my Lansky, 2 hrs! That has to be the hardest steel I have ever had to cut. The Manix I owned in S30V wasn't that difficult to re-profile. The BM 710D2 wasn't near that difficult. That being said I have never had a knife take so long to sharpen yet yield such a wickedly sharp edge. My goodness this thing as Daryl Ralph put it is "brutally sharp". I am glad I hung in there, because I was rewarded with the best edge I have ever gotten on any blade. I don't know about edge retention but I am going to find out. At first I was put off a little by this knife, but now... Oh, love is a wonderful thing! Does anyone know of any other makers that are using this steel yet? If you have the chance pick one up you will not be dissapointed. Thanks.:D
 
Hi harry,
what angle did you use? I don't have a Lansky but a Sharpmaker and have to reprofile it too, do you think It'll take more than two hours?
I'll probably reprofile it at 30º and then make a microbevel at 40º.
 
You're going to reprofile it with a Sharpmaker? It will take two days, not two hours! :eek:

Seriously, I don't think the standard Sharpmaker sticks have the abrasion necessary to remove that steel for reprofiling unless you are willing to spend a very long time working on it!

Do you have the diamond rods? That would help a lot.
 
DGG-Surprised by this? I am quite surprised. from what was said here on the forums and in Blade that the composition was near identical to 154cm. I have had no problems sharpening 154cm. I wonder what the HRC on this blade is? I am wondering if they took it higher due to its properties. Well, either way I love the edge it produces.

SanShou- you will definately get the diamond sleeves or get a Lansky you can get one around $30. Sorry!
 
It is supposed to be much easier to work than S30V, that is the main promotion. How thick was the edge and what was the origional angle?

-Cliff
 
Well I used 25 degrees with the Lansky, so if I am right that is 25 degrees per side. If this statement is true it had to have been atleast 45-50 degrees per side. It was very obtuse! The edge wasn't very clean or polished if that makes sense. It looked actually like someone took a Smith's V-sharpener and ran it along the blade. I really did not know how to feel about this knife when I first got it, but now it is really growing on me. I do have to say that the edge takes a fine polish and looks to be much finer grain than the D2 and 154cm bladed knives I have.
 
I think your perception is more due to the amount of work you have to do, due to the obtuse profile. When I reprofiled my Spec Bump it seem to me that it had less abrasion resistance than S30V. It left much darker trails on the stones and I seem to make much faster progress. This is of course only a personal perception. My Spec Bump was right around 40 deg included. But it was pretty thick behind the edge, too. After the reprofiling the thickness behind the edge is 0.035+" I believe (have to check when I am back home). That is huge considering that Justin from Ranger knives is running a RD9 with woodworking edge around 0.025".
 
It very could well have been perception. It was very thick, the edge now is wider with a thiner back bevel. It cuts like a laser though! It looked better with the thiner edge, but it is not being looked at it is being used. I did notice the blacker residue like you said, I also had to clean my stone more often seemed gummier.
 
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