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 Post subject: Re: Shapton Glass 120 used as a flattener?
PostPosted: Sun May 11, 2014 4:28 pm 
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Joined: Mon Apr 23, 2012 4:45 am
Posts: 1421
The 120 GS is a different formulation that the other GS. It is as thin as the other GS stones AND it dishes pretty quickly too - far faster than say the 220. It's my least favorite GS. The 120 Shapton pro has more than double the stone volume, but it too dishes quickly so neither stone is a good candidate as a flattener.

So you need to flatten the flattener. The 60 grit Nubatama or 24 grit Nubatama is an excellent flattener for very coarse stones, but for most everything else, go for the diamond lapping plates instead.

Actually the Naniwa synthetic Ohmura also dishes relatively fast, so much so that I don't recommend it for single bevel knives without reflattening it several times during a single session. I know a few people who have messed up their knives using this stone. This was commonly known a while back, but like so many bits of lost knowledge, we relearn what was once learned. It's an aggressive cutter, but compared to the 150 Nubatama Bamboo - well I've never looked back. If I didn't have a 150 Bamboo, I'd use it for getting scratches out from a XXC DMT or Atoma 140. While you could use the 150 Bamboo for flattening I wouldn't do that either, even though it dishes slower than the 150 Naniwa synthetic Ohmura. Use a good diamond plate. There are a few synthetic Ohmuras also out there - one from Hida tool that dishes even faster and cuts even slower. I have some scrap of that stone from years ago if someone wants it. Natural Ohmura have been used for flattening tasks, but I don't care for them either for this task. They are best for beginning to establish a Kasumi finish and are a good bit finer than the synthetics.

---
Ken



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