Thread: DMT Duosharp as lapping plate

From what I can see the scratch marks are a little finer than the grit equivalent in sandpaper- so I guess yes it leaves scratch marks but off the 325/coarse they are not bad. The Naniwas didn't need any more and because I am obsessive I took my jnat all the way up to 1000 but it would've been fine after the 325.

I also noticed that on the D8C I have the marks are not as "coarse" as the sandpaper equivalent.

Lapping my 1k Norton actually leaves the surface FEELING too smooth, but once you put steel to it, you can feel the abrasion. Could it possibly be that the diamonds are coarse, but they are so much smaller and closer together than on sandpaper that it leaves the surface looking and feeling smoother?

I know that makes no sense but it's the only thing that comes to mind right now.

I have two concerns with using them for lapping. One: I was told that when they are used in a stone holder with some force they may flex a little. Second: I used one and noticed it made a stripe pattern on the surface of a Naniwa and also on a Spyderco UF.

Hmmm. Not sure what stripe pattern you are talking about. Do you have pics? I have not seen this.

Not saying they can't be used for lapping. I just have these concerns. Here is the (poor quality) photo. Look very closely and you can see dark stripes. May not be important, but I didn't like this result.