JKI 1k/6k diamond stone first impressions

Mr.Wizard said:
One can get the equivalent of about 26 3"*8" pieces of 3M Diamond Microfinishing Film, PSA backed, for the price one Naniwa diamond stone. I wonder which would last longer?
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I would expect the resin stone to last a lifetime of keeping your personal knives sharp, a bit longer than 26 sheets of abrasive.

One big advantage to the resin stone is you can control how it cuts somewhat by how often you dress it. Do you want maximum aggression, but leaves a coarser scratch pattern, or broken in which isn't quite as fast cutting but leaves a finer scratch pattern, which is my preference.
 
D Diemaker Are you vouching for the Naniwa diamond stones? Have you used 3M DMFF? (After all it is a form of resin-bonded diamond.) You may have made the everlasting gobstopper of diamond stones but what about the others? You're not implying that all resin-bond diamond stones will last a lifetime, right? As earlier you wrote:

Diemaker said:
Diamond is some damned interesting stuff! Get it right and it lasts a very, very, very long time. Get it wrong and poof, it's gone. At least with powered grinding.
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I have only tried out some Venev diamond stones last August and think they will last a very long time as well. I have read what a few others think of the Naniwa stones, see how thick the resin and diamond layer is and so I think they will last a very long time too. Probably the most common feature of all the resins I have tried out is they don't wear when grinding steel, steel just isn't very abrasive. What happens is the diamond crystals get pulled out of the bond over use and the stones cutting ability slows down, eventually forcing the user to dress them to restore the stones cutting ability. The only things that should wear the resin is too much swarf when using them or dressing. I am also assuming that Naniwa uses good quality diamond, not the cheapest stuff you can find. Their prices are in line with this and they have a reputation for quality. This is what I base my statement on.
Caveat- If you dress your resin bond diamond stone after every knife to maximize it's aggressiveness the lifespan of the stone will drop significantly. If you treat them like I do, and EP, then a good quality resin bond diamond stone should last a lifetime of personal sharpening.

I have never used 3M's DMFF but HeavyHanded's coment on "easy to nick" the tapes brings back memories of EP's tapes. If you have never used them you don't know how fragile they can be. You can also "nick" a resin bond stone but all it does is shave off a little stone, nevermind what it does to your knife edge. It won't change the way the stone works and after a bunch of dressings it will go away. I think one disadvantage the tapes have for knife sharpening is you will probably put them on a hard backing surface, say aluminum. This seems to reduce their lifespan vs using them like shown in the technial pdf that was linked to, same with sic wet/dry paper.

That quote is from my experience grinding stone and ceramic. I also have 5" discs made with the same resin/diamond mixture as the Matrix stones that attach to a dc motor. They perform much better powered vs manualy with my Apex. The stones leave a much finer scratch patter spinning at 2000 rpm. Real handy for sharpening carbide or putting a fine edge on a scraper.
 
Used these stones on some 10v steel, the 1k appears to be about as fast as a DMT coarse, a visibly brighter finish at same working speed - no loading. Raised small burr and easily eliminated - actually raised a burr faster than the DMT C.

Microbevel with the 6k, very clean edge, no burr, no stropping, very sharp yet still quite aggressive. 4-6 passes each side. For doing a full overgrind, the 6k is probably perfect, for a dedicated microbevel stone, an 8k would be a nicer choice.
 
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