cpms125v

[hardheart]

Oh! I also has D2 in several places, CPM S30V in several places etc.
I may suspect that this may be due to different manufacturers doing heat treatment differently - what do you think?

Thanks, Vassili.

I think that makes your repeated demands to have Spyderco & everyone else switch to XHP based on one knife a little silly. You would have done the same if you had tested the Dozier D2 first, and then what would you say if you tested the Benchmade D2 after? What if the same thing happens with XHP & another knife/manufacturer?

Your tests do show a trend for how sharpness degrades. I think it also shows that different geometry above the edge does not have an extreme effect while cutting rope, at least no greater than any of the other variables, though it does not define what the effect is. But the tests also show how your sharpening results have improved over time, even though your choice of knives & alloys is not structured. The increase in your initial sharpness knife to knife may be skewing the results - your rankings are determined by rather small differences in final sharpness after 200 cuts. More than I think most would notice in regular use.

I don't think your method is rigorous enough to actually rank the steels, manufacturers, heat treats, or any one factor, since you haven't controlled for them. There is some value in the demonstration of performance outside a controlled environment. These are hand tools, we can't perform perfect cuts in identical environments on the same material all the time. But, something like the CATRA tests do that, and it is necessary. Rockwell tests meet a standard, charpy & izod, pin on disk, and all the other tests for steels have to follow a standard.

I was also told results for CATRA testing on a couple of alloys. I was asked not to reveal it, this stuff is confidential for some reason. All I will say is 19C27 is pretty decent stuff for this test, if you are a fan of the more common premium steel alloys.

 

[nozh2002]

I think that makes your repeated demands to have Spyderco & everyone else switch to XHP based on one knife a little silly. You would have done the same if you had tested the Dozier D2 first, and then what would you say if you tested the Benchmade D2 after? What if the same thing happens with XHP & another knife/manufacturer?

Your tests do show a trend for how sharpness degrades. I think it also shows that different geometry above the edge does not have an extreme effect while cutting rope, at least no greater than any of the other variables, though it does not define what the effect is. But the tests also show how your sharpening results have improved over time, even though your choice of knives & alloys is not structured. The increase in your initial sharpness knife to knife may be skewing the results - your rankings are determined by rather small differences in final sharpness after 200 cuts. More than I think most would notice in regular use.

I don't think your method is rigorous enough to actually rank the steels, manufacturers, heat treats, or any one factor, since you haven't controlled for them. There is some value in the demonstration of performance outside a controlled environment. These are hand tools, we can't perform perfect cuts in identical environments on the same material all the time. But, something like the CATRA tests do that, and it is necessary. Rockwell tests meet a standard, charpy & izod, pin on disk, and all the other tests for steels have to follow a standard.

I was also told results for CATRA testing on a couple of alloys. I was asked not to reveal it, this stuff is confidential for some reason. All I will say is 19C27 is pretty decent stuff for this test, if you are a fan of the more common premium steel alloys.

Can you please, move this to my testing thread in the "Knife review and testing" subforum?

Thanks, Vassili.

P.S. Who knows why CATRA test results confidential. May be it is same reason I have so much negative attention? It is bit over then expected and also on surprising level. But to me edge holding is most important property I as a consumer should know, and the fact that only few chosen had this information and not allowed to share it - is a bit disturbing.