Thread: lapping a 12K stone

Can a Chinese 12K stone be lapped using various wet/dry emory or sand papers and a steel machinist's surface plate?
GK

I've never done it, but it should work. It's a very hard stone, so you may be at it for a while, but I'd be surprised if the stone were harder than the grit in the paper (which is the only way that it would fail to work).

I've done it with 220 grit wet or dry and it worked very well. I don't know if mine was flatter than normal, but it lapped faster than one I lapped with a DMT8C.

Fred

Good To know!

Did you smooth the surface out any after the 220? If not, how'd it feel?

Russel:

Were you the one that raises a slurry on your Chinese 12K with a DMT plate for polishing edges on the 12K? I thought I remember someone saying they polished with slurry on that stone and I'm wondering if the results of polishing with 12K slurry on the 12K are more favorable than just water on the 12k.

Yellow coticule slurry stone on Yellow coticule stone has unfavorable results for me and I stopped polishing with anything other than water on a coticule but each stone is different of course.

Thanks.

Chris L

Russel, I didn't go any farther than the 220 on it and it felt really smooth to me. Probably should go to 600, but I doubt it would make any difference-you still have to make a lot of passes.

Fred

I used the diamond MST 200 whetstone, then DMT 325, for me it took not more than 10 minutes

in July I will have so in the low price

Originally Posted by Chrisl

Russel:

Were you the one that raises a slurry on your Chinese 12K with a DMT plate for polishing edges on the 12K? I thought I remember someone saying they polished with slurry on that stone and I'm wondering if the results of polishing with 12K slurry on the 12K are more favorable than just water on the 12k.

Yes, that is me. I use a 6"x2" diamond hone in 600 grit, but any diamond plate will work. I use the slurry to do a "pre-polish" when I use the 12k, it speeds up the process a little since the stone cuts so slow. Then I move to just water on it for a finer polish.

Originally Posted by Chrisl

Yellow coticule slurry stone on Yellow coticule stone has unfavorable results for me and I stopped polishing with anything other than water on a coticule but each stone is different of course.

Thanks.

Chris L

I use the Coticule with slurry for aggressive cutting, then polish the edge on the Coticule with just water. Then move to the 12k w/ slurry, then w/ just water.

Actually I haven't used it recently, been favoring the Thuringers/Japanese stones, but it is still a good method, produces excellent edges.