Thread: Playing with a Jnat

Originally Posted by Gasman

My understanding of SU is most the time its ok. But if the edges of the SU chip off and are weaker than it will cause issues. But you all know how much i know. Just what ive read when it comes to these stones.

I can say the grayish bluebstone is Asagi. The brown one im not sure about. And what mine i have no clue. I was just happy to have something to try out. Mine might cone back usefull. Itd possible.

Strictly speaking, if a stone has su it is not a razor grade finishing stone,. A skilled hand can use it as a pre-polisher for a razor but it's not a razor stone.

Also rare if it is Shoubu-dani Suita that it be a razor finisher. They were originally only used for sword polishing for the imperial family up to late 1500's.

Stones should be periodically lapped, so there’s no way around that. Lets keep our fingers crossed that it a]can be lapped out. If it’s just a few that are toxic, you can usually stablize the, with a fiberglass brush, just like any unstable sharp-edged defect like a crack, bias layer, etc.

I have a nakayama iromono that has su. Its very fast and delivers a softer edge than i like so i use it between my 1k and finish. This stone if its fast enough can bridge your 1k to your finisher.

I like this idea Bill. Thanks for the comment. Sounds like i will need to see how fast it is. Might be a good use for it.

Originally Posted by Gasman

I like this idea Bill. Thanks for the comment. Sounds like i will need to see how fast it is. Might be a good use for it.

Set a bevel on your 1k. Raise a diamond plate slurry on this stone. Once the 1k stria are wiped spray off the slurry onto your finisher. And work that and see. That's exactly what I do with mine.

Moving used slurry from stone to stone? When will all the ideas stop. So many different things can be done my mind is having trouble keeping up. Glad this is all in print!

Originally Posted by Gasman

Moving used slurry from stone to stone? When will all the ideas stop. So many different things can be done my mind is having trouble keeping up. Glad this is all in print!

Many skinned cats on this forum Jerry

The slurry after this stage goes straight to polish. Try it this way first. You may have to refresh with a Tomo or create a little more with your diamond plate. But one step at a time. You may also play with the amount of slurry on the mid stone. I'm only repeating what I've heard over the years so it isn't my idea or discovery. Just sharing. I doubt anybody can come up with something that hasn't been tried hundreds of years ago. Lol.

I agree that moving used slurry from one stone to another would mean it will polish more than cut as the slurry would be broken down very fine by then. But at that step polishing is what you want.
With all the reading I've done about using Jnats a lot of the theories and steps make since to me. Its just a matter of doing it. That's all. Sounds easy don't it. Lol.

I will get the opportunity later today to put steel to stone. Crossing my fingers.

Regarding su, here’s a Nakayama koppa that’s the poster boy for su. It’s a Shosui Takeda Nakayama koppa that was sold through CKTG a few years ago. It actually looks like someone froze champagne it has so many tiny su - that ‘sandy’ look is from all the tiny su. These are not the same kind of su that you see in suita layers, iron-lined hollows or vugs that can also contain sand. These are tiny and clean, they’re not toxic. The stone is hard.

It produces a fine, straight, razor edge with no micro chipping or artifacting, just like any other fine jnat finisher. You just have to try them.