DMT Coarse 325 8"

**Avenolpey** · 05-20-2014, 03:31 AM

I finally broke down and bought a DMT coarse for lapping. Amazing how heavy this thing is. It definitely does a better job than sandpaper sitting on my marble counters. It made quick work of my Coticule 7x2 and Shuobudani Type 100. The Naniwa 3/8 was a lot more work and I started to work on my C12k but it is so big and hard I am worried about wearing out the DMT. It also had a lot of surface tension on the Naniwa and PHIG and it became hard to move them on it. Any tips for overcoming the surface tension for large stones like the Naniwa or PHIG.

How long do DMT's last when used exclusively for lapping.

**Haroldg48** · 05-20-2014, 03:36 AM

Lynn has a youtube video about lapping. He recommends lapping under running water to keep them from sticking. http://youtu.be/

I did my Naniwa 12k today and it worked well. Not sure how long the DMT will last, but i'd assume a lomg time...they're very hard.

**nodakjohns** · 05-20-2014, 04:44 AM

I'm just about to pull the trigger on the DMT 325. Just received a naniwa 12k today got a C12k last week and a swaty enroute. So will be doing some lapping sooner rather than later !

**nodakjohns** · 05-20-2014, 04:56 AM

OK I just ordered myself the DMT from SRD!!!!! Can't wait to get it.

**Haroldg48** · 05-20-2014, 12:05 PM

Originally Posted by nodakjohns

OK I just ordered myself the DMT from SRD!!!!! Can't wait to get it.

When you get it, here are a few helpful tips that I got from members here:
1) Break it in, by rubbing the shaft of a screwdriver or older knife up and down it some in order to remove any "misplaced" pieces of diamond that could otherwise put a scratch in your hone.
2) Keep it wet when lapping by doing it under running water.
3) Don't let the "slurry" build up; rinse it off both the hone and the DMT regularly during the lapping.
4) Use the pencil grid technique on your hone to make sure that you get it really flat.
5) Clean it after use with Comet or Ajax and a nylon scrub brush.

Many of those instructions come with the DMT, but I know how "we" are with reading instructions

**bill3152** · 05-20-2014, 10:47 PM

DMT will not hold up to vigorous lapping on very hard naturals. Use the 60 grit wet/dry for that. Synths should be no problem at all.

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