Thread: JNAT & Nagura questions/identification - help!

Originally Posted by mainaman

the problem is that the slurry tends to gather in the middle of the stone and it will never be perfect flat.

Use sliding and rotating 8-like motions on slurry and you will have no such problem.

BTW when you are lapping jnats on hard ceramic or cast iron plate you wouldn't have troubles with wearing of the lapping plate so you don't need to use 3 plates or stones.


I have used silicon carbide slurry on glass/ceramics/etc lapping plate a lot of times always checking flatness with toolmaker's straightedge and I have never came accross any issues with flatness.

I'm still a little skeptic to how flat it gets with a plate and loose powder, that's how they used to make lenses in the old days.

Originally Posted by Lemur

I'm still a little skeptic to how flat it gets with a plate and loose powder, that's how they used to make lenses in the old days.

You don't need to be so sceptic. Just try it and check the flatness. All you need for the experiment are a piece of flat glass ( thicker is better ),
some flat surface to put it on and loose powders of silicon carbide. It's very cheap and able-to-get.

It is much cheaper than DMT plates and it gives better surface condition of honing stone.

Originally Posted by Nikolay

Use sliding and rotating 8-like motions on slurry and you will have no such problem.

BTW when you are lapping jnats on hard ceramic or cast iron plate you wouldn't have troubles with wearing of the lapping plate so you don't need to use 3 plates or stones.


I have used silicon carbide slurry on glass/ceramics/etc lapping plate a lot of times always checking flatness with toolmaker's straightedge and I have never came accross any issues with flatness.

Not going to work still, slurry accumulates in the middle and you can see that in the video you posted.
Then the base plate will also dish and the whole process gets inaccurate.
The correct way to do it to use Kanaban, but that works only with coarse grits and requires lapping from time to time as well.

Those things are sold in Japan for ~50 usd, and work well on low grit stones

here a video of a somethig that may work well