Thread: Ozuku Jnat lapping with DMT 325?

I've been getting wonderfully smooth edges using an Ozuku asagi jnat. I am wondering how to lap it. I've lapped my norton 4k/8k and coticule with a DMT 325 with great success. Will the the DMT325 work well on a hard Jnat? It seems that the 325 would be too coarse for the smooth jnat. Should I lap with a DMT 1200 or something finer? Any recommendations are much appreciated.

Tnx,

Charlie

I use the 325 dmt, then i spent some time rubbing my coticule slurry stone over the surface, a good 20 minutes, thenthe same with my tommonagura stone, job a good an.

gary

i just got the same stone and had some great smooth edges also

I have used a DMT 325 for initial lapping on my JNats.
However, I usually also go thru a progression of flattening using a DMT 600 and a DMT 1200 before finishing it with a good 10-15 mins of rubbing it with an equally hard JNat.

I have flattened a few very hard jnats with my dmt, I didn't encounter any problems. After a few uses with the slurry stone, it was as smooth as it could be. I didn't find any performane differences between the two, but I didn't even bother to find out if there is a difference. If you don't push too hard, it won't leave too big scratches in the stone, it is too hard to really dig in with a lot of water and almost no pressure.

Just out of curiosity: is it necessary to flatten your ohzuku or is it still in good shape?

No, not necessary. I just like to obsess about technique. Perhaps I will never hone it. It kind of makes my stomach squirm at the thought of taking a diamond plate to this stone. On the other hand, it is just a rock that we've somehow elevated to mythical status. And then I convince myself that the edge is somehow smoother than what I get on a manmade stone.
-Charlie

On my Japanese natural stones I use my Atoma 400 exclusively for both lapping and raising a slurry. On all of my synthetic stones, Naniwa's, etc. I use my DMT 325.

I've been using a dmt 325, then a BBW, then my coti, gives it a mirror finish on it if you look at it at a 5-10 degree angle

[QUOTE=instantcrow;871438]I've been getting wonderfully smooth edges using an Ozuku asagi jnat. I am wondering how to lap it. I've lapped my norton 4k/8k and coticule with a DMT 325 with great success. Will the the DMT325 work well on a hard Jnat? It seems that the 325 would be too coarse for the smooth jnat. Should I lap with a DMT 1200 or something finer? Any recommendations are much appreciated.

Tnx,

The DMT 325 will work fine for lapping. If you wish to smooth the surface even more with DMT 1200 that is OK too.. The main thing is that your stone surface has to be FLAT. If your stone surface is un-even or dished out you will get a frowning edge.
MIke

I lap all of my stones with older worn out 600 Atoma plates, they probably act more like a 1000 though because I have had them so long. I also normally use these same Atoma to raise a slurry from this host stone instead of a tomonagura, it is easier, quicker and then I know for sure that my expensive Oozuku or Nakayama or whatever host stone, supposedly my finest, is actually supplying the grit making up the slurry. Granted, there are some excellent pieces of tomonagura out there, but if it was a junk stone to begin with, and that is why it got cut up, then what is the point of interjecting some unknown grit or rogue particles into the slurry. If the host stone if fine enough for finishing a razor, I like the idea that the slurry grit is also of the same material, fewer unknowns. Any little scratches from the Atoma get ground down within minutes if not seconds from the razor/slurry action anyhow. Alx