Thread: Can the DMT8C lap and round a 1K?

Hi,

I know the rating is for 2K+ but I am wondering if you can round the edge of a 1K and lap it with the DMT8C, or may it rip off the diamonds?

In particular I was thinking of using it for the Naniwa 1K. Or would this require the XC.

Thanks

If I understand you correctly, you can lapp your 1k with a D8C. The edges and corners are tricky due to the base. It makes it difficult to get a good angle, but it can be done.
Wet sandpaper is easier....You won't hurt the diamonds, it's the hardest substance on Earth....

With Naniwa, it's best to do any lapping under running water due to swarf build up....

You won't hurt the diamonds, it's the hardest substance on Earth....

I think the real issue here is whether or not the diamonds will
be dislodged from their nickel substrate. I've certainly used a
D8C to lap Naniwas all the way up from 1k, but I can't say
what effect it has had on my DMT.

Another approach that I've heard advocated is to start with the
120 (XX?) and get it flat. If the finish left on the stone isn't as
smooth as you'd like, a little bit of work with the D8C will get
it nice and smooth fairly quickly.

- Scott

Could someone please verfy if the surface of a DMT is really made of Nickel.
I mean pure Nickel.
I would guess it is made of Steel, alloyed with nickel (and very possibly chromium) for the sake of corrosion resistance and toughnes.
But pure Nickel would seem very expensive, as it is costy.
It is mainly used for surface coating or catalytic reactions and is being avoided nowadays as it has hazardous properties (not in alloys, of course).
I would be very happy if someone would actually know or point me in the right direction

Originally Posted by Lesslemming

Could someone please verfy if the surface of a DMT is really made of Nickel.
I would be very happy if someone would actually know or point me in the right direction

I don't know that it is 'pure' nickel. On the continuous plates the diamonds are said to be in a 'substrate' of nickel plating. If you make the mistake of lapping a norton 4k on a DMT 1200 you will see the nickel as a gray swarf on the white surface of the norton. I know because I've done it. Here is the DMT (dia-sharp) website.

Originally Posted by sproosemoose

Hi,

I know the rating is for 2K+ but I am wondering if you can round the edge of a 1K and lap it with the DMT8C, or may it rip off the diamonds?

In particular I was thinking of using it for the Naniwa 1K. Or would this require the XC.

Thanks

I have the DMT8C and lapped / rounded the Naniwa 1k with almost no effort.