Thread: Lapping recommendation for corti

Hi,
I've never lapped a hone before, let me know what you think might be the better approach--

I just received a 6x2 corti, and I also happen to have a 6x2 600 grit (red-fine) DMT hone in the garage. Would the preferred method be to use sandpaper (per the wiki), or use the DMT? I'm wondering if I might have a hard time making the corti surface flat with the DMT since they are *both* 6x2, whereas I can use a larger piece of sandpaper.

Let me know what you think,

Chief

Although DMT recommends 325 or coarser for lapping I would use the 600 under running water in the sink. Draw a pencil grid on the stone kind of like a kid's tic-tac-toe game. When the grid is gone your stone is flat. I lap 8" stones with 8" diamond plates regularly.

What is a corti?

Did you mean coti, for coticule?

Originally Posted by Utopian

What is a corti?

Did you mean coti, for coticule?

I am going to assume he is referring to the ultra-rare Welsh Coticule aka the Corgi or Corti.

Very fancy stone, very hard to find.


All kidding aside, I think the DMT would be the better option.

There is a lot to be said for using coarse sandpaper for lapping harder hones, where there is no risk of coarse grit being embedded in the hone. I've used a range of grits starting at 120, and it speeds the task up enormously.

BUT ... a coticule can contain minor imperfections. When I used a DMT D8C to lap mine it revealed two hairline cracks near the edges. But because I took it easy it didn't matter, the stone stayed together and I can't feel the cracks.

If I had been using coarse sandpaper (or even a D8XX) I suspect I would have broken fragments off the surface.

My Coti is a "standard" one, if you have a "select" coti, maybe you wouldn't have to worry about this.

Originally Posted by joke1176

I am going to assume he is referring to the ultra-rare Welsh Coticule aka the Corgi or Corti.

Very fancy stone, very hard to find.


All kidding aside, I think the DMT would be the better option.

I actually *have* a Cardigan Welsh Corgi (and two greyhounds-- quite a show when we take them for a walk).......

I lapped the coticule with the 600 grit DMT, worked great.

Chief