Thread: Big trouble with Naniwa Superstones 10000 and 12000

Originally Posted by thebigspendur

We can all sit here and guess what is happening however the issue you have is not common but something is causing those scratches and chips and you are spending way too much time on this...

Yes, You can only guess, and I am grateful for all Your thoughts. Sometimes it is the obvious that is not in sight.

Originally Posted by thebigspendur

... Are you sure you are not hitting the edge of the stone as you hone causing this problem?

Quite sure. But I'll hopefully be sure after tonight.

What I have in mind is
- break the edges, probably with a clean steel file
- lap the stone again with a 5k and 8k stone (pen grid until vanished)
- careful straight strokes with a prepared razor or something like a scraper and examination.

Thx

Have you looked at the stone under magnification,just curious.

Originally Posted by Euclid440

Sounds like contamination, especially since you are using sandpaper. I would first clean your stones with cleanser and a scotch-brite pad and rinse and scrub again with the scotch-brite under running water.

Then take a straight edged kitchen knife and run the knife slowly over the stone to detect any snagging grit. A large knife may dislodge the imbedded grit. Also as recommended insure the edges are well beveled or rounded.

If you use wet and dry, (I use W/D lapping natural stones) use quality paper.

Lastly, bite the bullet and purchase a diamond plate, if you are going to hone, a diamond plate will make your life so much easier and give you consistent surface on your stones.

Yes, it sounds and looks like contamination. but I have taken milimeters away since I last used sandpaper. Sandpaper I used was used wet paper by 3m with 600 grain.

I will buy a diamond plate. Wanted to do it anyway since You all guys seem to use ist successfully. DMT is not easy to get in Germany but the tip by Neil Miller to use Atoma was helpful.
On the other hand, I am not willing to accept that good results are only possible when using a diamond plate.

As I said in my OP, I am not sure if anyone of You, not using a microscope, would ever realize this happen. You will probably not see those with a 30 power loupe, unless there are lots of them.

Originally Posted by pixelfixed

Have you looked at the stone under magnification,just curious.

I had the idea, but forgot. Will do tonight if I can get it into view and / or detect anything causing this.

Thx

Some stone manufacturers actually don't recommend using sandpaper for flattening their stones.Also, are you honing under running water? It might help. From what I see, it must be the stones.

Originally Posted by DDTech

I had the idea, but forgot. Will do tonight if I can get it into view and / or detect anything causing this.

Thx

That may be interesting,hope you can do it.Not a clue as to what you may be looking for but should you send the stones back to the vendor I am certain that would be the first thing they would do.

Originally Posted by pixelfixed

That may be interesting,hope you can do it.Not a clue as to what you may be looking for but should you send the stones back to the vendor I am certain that would be the first thing they would do.

Yes, for them as well as for me... maybe for some of You also. Actually I think, I'll pack my things soon and leave the office...

Originally Posted by Vasilis

Some stone manufacturers actually don't recommend using sandpaper for flattening their stones.Also, are you honing under running water? It might help. From what I see, it must be the stones.

I read a post from someone who is doing the finer grits under running water. I did not try yet, as it was too dangerous. My sink is quite deep. I would have to have a "bridge" to put the stone on. However, every now and then, I hold the stone under running water.

DMTs im Deutschland hier; DMT® Diamantsteine | DICTUM GmbH - Mehr als Werkzeug

If it were one stone, I'd say bad stone. But if you have two different fine grits doing the same thing, it's probably something else. What are the chances you got two bad stones from two different batches?