Thread: Lapping Ch12k

I recently lapped a new C12k I got from woodcraft with my DMT D8C, I did the pencil lines. Lapped it in the sink with water running to reduce the sticking. It lapped flat in about 5 minutes. I checked it with a straight edge, several times. I did the corner and sides too. Has anyone else seen this phenomenom. I've heard it can take around 30 minutes. This stone was far from true when I bought as confirmed by my straight edge.

Rich

You could just have a very soft stone.

Unless you lapped it with a few hundred pounds of pressure at 1000 passes per minute...

LOL, I know. It just blew me away, I kept checking and rechecking, I guess I got lucky. It's quite smooth and true, I'll test drive it today. I have a razor that can use some tweaking, then hit it with the dia .50 and test.

A few guys have reported the same. Is it the large one?

Mine is the large one and it took forever with a DMT8C.

zib,

Mine is also one of the larger Chinese stones and I wore the diamonds off one end of a DMT8C with it. Apparently you are one of the blessed lappers.
May your gift transfer to honing.

Originally Posted by kelbro

A few guys have reported the same. Is it the large one?

Mine is the large one and it took forever with a DMT8C.

Yes, it is, from woodcraft. it was definitely off when I got it, The D8C made quick work of it.
I was really surprised. I expected it to take a while.

I flattened mine with a Norton flattening stone. I then dressed with 1K Wet/Dry wet and it took awhile but it was way worth it. I rarely have to redress it.

I just redid mine, which is a hard one. I went a somewhat nonconventional route though; I wanted coarse grit sandpaper that could hold onto it's grit much better than wet/dry. At the hardware store I noticed that the 3 inch wide belt sander belts seem to be much more heavy duty than regular sandpaper or wet/dry, so I picked some up in 50 and 120 grit.

I cut each belt at the seam from the back of the belt, and laid the 50 grit flat on my granite reference plate. I wet my Chinese 12k, splashed some water on it, and went to town with the 12k. The 50 grit was great for removing material fast. After I did the four long sides, I switched to the 120 grit.

The 120 grit smoothed out the scratches left by the 50 dang well, and I rounded the corners on the 120. I finished by consecutively lapping on 220 wet/dry and then 800 wet/dry, which left a very smooth surface.

it costs about four or five bucks for two belts in each grit, and they didn't lose any grain lapping the 12k, which was much better than the standard coarse open cut sandpaper I had tried earlier.


It seems to be a great replacement for the DMT XXC on the cheap.

YMMV.

I just redid mine, which is a hard one. I went a somewhat nonconventional route though; I wanted coarse grit sandpaper that could hold onto it's grit much better than wet/dry. At the hardware store I noticed that the 3 inch wide belt sander belts seem to be much more heavy duty than regular sandpaper or wet/dry, so I picked some up in 50 and 120 grit.

I cut each belt at the seam from the back of the belt, and laid the 50 grit flat on my granite reference plate. I wet my Chinese 12k, splashed some water on it, and went to town with the 12k. The 50 grit was great for removing material fast. After I did the four long sides, I switched to the 120 grit.

The 120 grit smoothed out the scratches left by the 50 dang well, and I rounded the corners on the 120. I finished by consecutively lapping on 220 wet/dry and then 800 wet/dry, which left a very smooth surface.

it costs about four or five bucks for two belts in each grit, and they didn't lose any grain lapping the 12k, which was much better than the standard coarse open cut sandpaper I had tried earlier.


It seems to be a great replacement for the DMT XXC on the cheap.

YMMV.

Mine was the same way. Maybe 10 min tops. I though I did something wrong for a while but never had any problems.