Naniwa Super Stones

Sharpski

Sharpski

Joined
Jun 10, 2012
Messages
784
I just ordered some new naniwa super stones and they should be one their way soon. I would have upgraded to the Chosera but I couldn't afford the extra up grade....bought too many new knives!

Anyway I am looking forward to them and I was wondering if anyone had some experience with them they may like to share or better yet some advice.

It says you don't have to soak them just use water with sharpening...how does this work? Do ppl still soak them?

Tips on slurry for the stones?

Maintenance? I have a norton flattener already.

Threads to read on water stones or specifically the super stones.

Any other random tips are greatly appreciated!!

Grits I have= 220, 1000, 3000, 8000, 12000
I have some experience but its not extensive and not above 800 grit (norton "water stones")

THANKS!
 
*It says you don't have to soak them just use water with sharpening...how does this work? Do ppl still soak them?
It's resin bonded, thus splash&go. beside, it won't absorp much water anyway. I don't know whether this stone has magnesium salt or not, if it does then prolong soak with soften-water (high sodium) may cause a bit of rust on semi-stainless steel (zdp, m4, d2).

*Tips on slurry for the stones?
Mud = broken down abrasives & binder -> higher polish than rated grit.
Slurry (raise by diamond or nagura) = add lapping action, smoother surface finish. Use-up your stone faster.

*Maintenance? I have a norton flattener already. Is Norton diamond??
Flat using DMT XXC or Atoma 140 then smooth out using nagura.

*Threads to read on water stones or specifically the super stones.
Dig for stones of your choice in KitchenKnifeForums.

*Any other random tips are greatly appreciated!!
Most waterstones are not effective (profile & major work) against wear resistant steels, since Alumina (Al oxide) is the common abrasives therefore can't abrade Vanadium & Tungsten carbides. Except from what I read, JKI Gesshin stones actually can handle super steels. I plan to buy a couple of Gesshin stones soon and hope for a confirmation in perf against fancy alloys.
 
The Choseras do deal with vanadium and tungsten carbides. For the last one, as in Aogami Super, you should start with a relatively coarse grit.
 
Benuser said:
The Choseras do deal with vanadium and tungsten carbides.
Click to expand...

Chosera binded abrasive is white aluminum oxide with mohs around ~9, while VC and WC mohs around 9.6 and 9. Like most waterstones, they abrade steel matrix, essentially work/under-cut around VC & WC. Aogami Super http://zknives.com/knives/steels/steelgraph.php?nm=Aogami Super is tough but 2.5% W + 0.5% V is easier to deal with than s30v 4% V. SiC abrasive will cut WC but not VC. Diamond/CBN will cut all type of carbides.
 
.05% V is a grain refiner in that small of a amount, it does nothing for wear resistance. You can't even compare it to a super steel because the alloy elements do completely different things when the percentages jump like they do for PM steels.

Soak all stones, even splash-n-go stones benefit from a short soak.

Do not make a slurry with superstones, the binder does not work that way.

Use a nagura to keep the stone true and flat, this is a synthetic naguras only use. The stone flattener is for when the stone gets a severe dish.

Other tips: 8k and 12k will be extreme on all but kitchen knives and straight razors. Take your time at high grits or you simply won't get results.
 
knifenut1013 said:
.05% V is a grain refiner in that small of a amount, it does nothing for wear resistance. You can't even compare it to a super steel because the alloy elements do completely different things when the percentages jump like they do for PM steels.

Soak all stones, even splash-n-go stones benefit from a short soak.

Do not make a slurry with superstones, the binder does not work that way.

Use a nagura to keep the stone true and flat, this is a synthetic naguras only use. The stone flattener is for when the stone gets a severe dish.

Other tips: 8k and 12k will be extreme on all but kitchen knives and straight razors. Take your time at high grits or you simply won't get results.
Click to expand...


Thanks knifenut,
Yea I figured soak them for a bit would not hurt! Right the 12k is reserved for my striaght edge and shun collection. I may try to bring some folders up to 8k we'll see how long that takes me to try (need to boost my skills first)

So will I have a problem sharpening s30v or s35vn? Are harder steels like m390 and s90v totally out of the question?

When you say take your time at the high grits do you mean be extra mindful of your angle, use even stroke with even pressure or literally make slow strokes. Sorry I am just trying to lessen the learning curve.

thanks!
 
Just be careful, its easy to ruin a edge at high grits by being sloppy or not paying attention. Speed is built with skill, stay focused now and let the speed come as your skills increase.

S30V will probably be fine but the others will struggle, S35V and S90V you can try but I wish you good luck. One stone or stone set does not cover all the bases when you have a variety of steels. I would recommend a few diamond hones for the high wear stuff and you should be good. A coarse/fine/extra fine DMT would fill the gap well.
 
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