Naniwa Diamond Waterstones Review.

M Mrs_Esterhouse

Mr.Wizard said:
I just read the report Edge Rolling in High Vanadium Knives Sharpened with Aluminium Oxide versus CBN/Diamond and I have a question. Did you do any testing of mixing abrasives types, i.e. shaping on aluminum oxide and finishing on 3 micron diamond, or shaping on cBN and finishing with the Tormek compound? If not would you consider doing this for Elmax where the effect was most dramatic?
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wootzblade said:
We can tell without exhaustive testing that an edge apexed with conventional abrasives and honed with diamonds will have properties of all-diamond sharpened edge, while the edge apexed with diamonds/CBN but honed with conventional compounds like Totmek honing paste will have properties of all-Al2O3 sharpened.
This is because weakening of the steel matrix happens during fine honing, not bevelling.
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Mrs_Esterhouse said:
What's a good finishing grit for 20CV?
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Sorry, you're asking the wrong person. I'm not sure I have ever sharpened a 20CV blade, or even the equivalents (M390, CTS-204P). My own "better" knives were purchased when S30V was hot stuff, and knives other people have me sharpen are mostly lower tier kitchen knives.
 
Mrs_Esterhouse said:
What's a good diamond finishing grit for 20CV?
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Depends on your usage. Do you prefer a coarser edge or a finer edge? Slicing or push cutting? There is no single right answer.

If you read the threads here you'll find quite accomplished sharpeners who prefer anything from a coarse edge, (roughly 220 to 325 grit), to a very fine edge, (1200 grit or higher). Depends on how they intend to employ the knife.
 
Blues said:
Depends on your usage. Do you prefer a coarser edge or a finer edge? Slicing or push cutting? There is no single right answer.

If you read the threads here you'll find quite accomplished sharpeners who prefer anything from a coarse edge, (roughly 220 to 325 grit), to a very fine edge, (1200 grit or higher). Depends on how they intend to employ the knife.
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I like a hair popping sharp edge. Intended uses are cardboard, plastic pallet wrap and pallet straps.
 
Mrs_Esterhouse said:
I like a hair popping sharp edge. Intended uses are cardboard, plastic pallet wrap and pallet straps.
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You can have hair popping with a variety of finishes.

Personally, I'd keep it in the "coarser" range, but you should test it out for yourself with a couple of grits. Something in the 600 grit range might give you a nice balance.

You'll get a range of opinions, all of which will have value imho.
 
Father & Son Traditional Sharpening said:
Which of these stones would give an edge refinement similar to DMT Coarse or Fine? Looking at trying one of these that is in the range of say 800 grit somewhere.
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I don't have the Naniwa diamond stones, but the finish on the Venev F240 (roughly similar grit size to DMT C) leaves a better finish than a 600 grit "fine" diamond plate (mine is Ezelap, but I believe it is more or less the same as DMT F).

I would be surprised if even the 400 grit Naniwa left a coarser finish than a DMT F. Someone with experience with the specific stones will correct me if I'm wrong though.
 
I'm sure it's not technically correct, but from a practical point of view, the way I think of the Venevs, relative to Japanese stones like Shapton or Naniwa:
F240 = 500 grit
F400 = 1000
F800 = 2000
F1200 = 4000
 
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