Thread: DMT Coarse 325 8"

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.

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.

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 !

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

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

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.

my plates have held up to a lot of use. DMT has a video and recommends that it is either used under water, as in in a pan of water or under running water in a sink. I have put mine through a lot and they keep going.

I've been using my DMT 325 for almost six years, and mostly on naturals, and some very hard ones. It still cuts quite well, although it's not as fast as when new. But, sometimes we seek a well broken-in DMT also..

Don't worry ... It will last you a good long time, on synth or naturals.

I picked up a new DMT 325 plate for lapping about a year ago. Decided to go with the 10" size. Talk about a heavy plate but works fantastic. I use it under running water. Only way I've found to break the surface tension is to slide the hone off the end of the DMT while slightly pulling upward.

I've had my DMT for about 4years now and use it for both knife bevel setting and superstone lapping and it's still going strong so they defiantly last a fair while.

As others have said use lots of water when lapping the superstoNES. I also find it easier to secure the DMT on the bench and rub the superstones ontop rather than the other way aground. It just seems easier to break the surface tension th way