Stone reconditioning....

[Brock Cutlery]

I found a couple of Suehiro stones at a garage sale this weekend. Badly used and abused.
I usually flatten my stones (take out any dish) with a Shapton glass 320, but these seemed beyond that. They had fairly deep chisel marks as the guy was a wood worker.
I figured I needed something coarser than the 320 to make any headway in my attempt to resurrect these stones, so I came up with the idea of using my granite plate and some 180 grit paper, wet.
It actually worked very nicely. Very satisfied with the results, and it was not overly difficult to take out the deep dishes and scratches from these two stones. These are 1200 and 4000 stones.

 

[Jason B.]

That's one way to do it be be mindful that the sandpaper grit can imbed into the stone. Doesn't happen often but it can happen.

I would also recommend a good diamond plate like the Atoma 140 for consistent lapping.

 

[Wowbagger]

I would add to bevel the edges of the stone where the surface has been taken down enough to create a sharp edge on the stone. You could do this any number of ways. If the edge is too sharp the stone tends to superficially crack and flake along there.

PS: the stones are looking nice (and useful) again, good job; it is a shame what he did to them.

 

[Jason B.]

One more little hint.

The Shapton Glass stones are sensitive to surface texture and by using the 320 as a lapping stone you are most likely smoothing the surface and greatly reducing the cutting power of the stone.