Hello! Got a stone issue, let me know where to place this request.

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I wouldn’t worry about the tiny dips in the new stones. Naniwa pro’s are great stones. I always flatten new stones myself. You’ll be fine sharpening with those tiny dips though for sure. Good on the retailer for replacing them for you. I’ve had stones show up with a corner knocked off slightly. It definitely happens.
 
You seem to have bad luck. Nothing more then that. Three times in a row? Yes, still bad luck.

Most people here don't recognize the gummy stuff coming off after a lapping or just using it.
Most people here don't have these craters. A few tiny pitholes maybe, but it should not be that bad that your knives bumps over it. It harms your edge too easily. Next to this, the crater will get bigger as you easily chip carbides out of it. You shouldn't be needing to flatten your new stone.
Totally different stone, same problem.
Normally Naniwa have great stones. My 400 pro and 600 chosera were flawless aswell

It's not a bad batch either. A batch is the same endproduct made around the same time. So they all have the exact (within tollerance of the factory) same specifications.
You are talking about 2 different problems and different stones. Unless they were drunk at Naniwa and put all parameters out of tolerance or all ingredients were out of spec...

Just 3 times bad luck.

I would skip the casino this week. Maybe even till you receive a proper stone ;)
 
Thank you all for the amusing responses. This can’t just be bad luck. I am a little disappointed tbh.
 
Yes... it can
I hope you can see that.

I'm not going to try to convince you, other then simply this: 99% of the people here don't have the problem you are having with the same stones.
Either Naniwa has a personal vendetta with you, or.... just bad luck.



Since you said you bought from different retailers, you can also rule out that your first vendor got some kind of cheap knockoff stones or something...
 
I have a set of these stones ,Naniwa Chosera, and am very happy with them. I rubbed my stones to see if I could simulate the effect and was able to do so. I, however would not consider this a bad thing.

These are soft stones intended for fast cutting. As you sharpen a knife the abrasive materials in the stone become dull. The duller the abrasive the more friction is created until the abrasive particle is released from the binder exposing fresh, sharp abrasives. Having a binder that releases abrasives easily means you will always be sharpening on fresh abrasive equaling faster sharpening of your knife.

The forceful rubbing with your rubbery fingers is simply enough friction to rip the abrasive media from the binder in the stone.

Comparing these stones to your King stone means nothing. These are not King stones. They have different abrasive compositions and different binder compositions. They also cut much faster.
 
i got all my nanipros from fine-tools.de or com or whatever it is. they were all good.
 
Over the years I had nine Choseras/Pros with knivesandtools.nl
With one of the 400s I found a irregularity, an inclusion. Had absolutely no impact on the sharpening. It appeared to be a wooden splinter deep of 2mm.
 
I got them from all over the world. No issue. The link was for this last one.
But I understand that some have some problems. I saw some pull-out items sold as Naniwa stones, with different issues and in good numbers. I wonder just how many have such problems and at what level would the problems be considered enough not to be Passed.
 
My Chosera 800 came with a small crater as well, but that did not affect sharpening at all. After some use, it's gone from wear, and no new issues have arisen.

I just recently bought a Naniwa off-spec 4000 grit stone. It's was pulled from regular sales as the color was off after being in the kiln. Just received it yesterday, will report back after I've had a chance to test it.
 
DHunter86 said:
My Chosera 800 came with a small crater as well, but that did not affect sharpening at all. After some use, it's gone from wear, and no new issues have arisen.

I just recently bought a Naniwa off-spec 4000 grit stone. It's was pulled from regular sales as the color was off after being in the kiln. Just received it yesterday, will report back after I've had a chance to test it.
Click to expand...
A Naniwa 4k? Which series?
 
No idea, something for the domestic market I suppose, but definitely not their pro or chosera line.

https://www.ebay.com/itm/164312816237
Bought it coz it was sufficiently cheap and had shipping weight leftover. Supposedly the mud and dish resistance is between the super stone and chosera.
 
Ok, found some time to test it on a Blue #2 kiridashi. Mine came in perfect condition, other than the color being off (which was expected); no craters or anything.

The finish on the wide bevel is definitely not as fine as the Chosera 3000, and definitely muddier. But I can see this having a place in my stone collection for pre-polishing wide bevels before jumping over to Jnats. Can't say I love the "resin-like" smell from the mud though.

Also, no residue or anything peeling off the stone after using and drying it.
 
It’s 15 months later and the stones “bedded in”. The problem disappeared but surfaces on a Rika, must be something in the water round here! or just needed to lap /wear the stones in
 
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