DMT325C Contaminated?

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03-11-2011, 04:02 AM
Shoki

DMT325C Contaminated?

Hello,

I have been using my DMT325C as a kitchen knife sharpener. I have also been trying to use it as a Norton 4k/8K lapper. It seems to be imparting "dirt" or perhaps steel to the Norton.

At first I thought this was normal. I thought the Norton was picking up some of the steel from the DMT.

The stones seemed to really fill up fast and stick together so I thought I would try a little 600 grit wet or dry sandpaper using the DMT325C as a base.

To my surprise is didn't load up as fast as the DMT alone and it actually left the Nortons "clean" no silver steel residue or build up.

Do I need to have separate hones for my kitchen knives and keep them away from my razor hones? It seems to me that the answer is yes.

What can I do to clean the steel build up form my DMT 325C?

Thank you,
--Shoki
03-11-2011, 04:25 AM
hi_bud_gl

Quote:

Originally Posted by Shoki

Hello,

I have been using my DMT325C as a kitchen knife sharpener. I have also been trying to use it as a Norton 4k/8K lapper. It seems to be imparting "dirt" or perhaps steel to the Norton.

At first I thought this was normal. I thought the Norton was picking up some of the steel from the DMT.

The stones seemed to really fill up fast and stick together so I thought I would try a little 600 grit wet or dry sandpaper using the DMT325C as a base.

To my surprise is didn't load up as fast as the DMT alone and it actually left the Nortons "clean" no silver steel residue or build up.

Do I need to have separate hones for my kitchen knives and keep them away from my razor hones? It seems to me that the answer is yes.

What can I do to clean the steel build up form my DMT 325C?

Thank you,
--Shoki

i think you DMT's life is gone now.
try to lap norton and see if black similar to slurry comes out then it is over.
you will need to get another dmt.
03-11-2011, 04:29 AM
holli4pirating

You shouldn't let your DMT's load up while lapping. You should be lapping under running water, and rinsing both the DMT and whatever you are lapping periodically.

It sounds like you may be ripping the diamonds out of the DMT. If anything comes off it's surface, that's what it would be (unless there was something else stuck to your DMT before you started).

Are you seeing shiny areas on the diamond side? If so, you are ripping the diamonds off and exposing the metal under them.
03-11-2011, 04:32 AM
Pete_S

Yeah, it sounds like you might be pulling up the nickel binder or the plate the diamonds rest on. You should be able to clean the DMT with dish soap and get rid of most of the swarf from your knives and transfer very little to the stone.

See if the DMT has smooth patches on it with your fingers. If so, then the diamonds have been pulled out of those areas.
03-11-2011, 04:51 AM
JimmyHAD

DMT (Dia-Sharp) recommends lapping under running water. They also recommend honing knives, or whatever, with a couple of drops of dish soap in the water on your plate. .
03-11-2011, 05:29 AM
gugi

i'm thinking if what goes onto the norton is steel i.e. swarf, it's easily solved by cleaning the dmt first. scrub it with comet/ajax or similar, that cleans it really well.
otoh if you're pulling the nickel/diamonds off the dmt that's no good and you should stop right away, may be ask dmt about it.
03-11-2011, 07:17 AM
SharpMan

Use more water while flattening and also clean the dmt
plate thoroughly when you start flattening another stone.

Sharpman
03-11-2011, 07:35 AM
Birnando

I have a few of the D8XX diamond plates, the 325, 600 and 1200.
I was very excited to finally receive them, after reading a lot of good reviews of them.

However, my impression of these plates are less than stellar.
They shed diamonds and they leave way too deep scratch patterns for my liking, compared to its relative grit size.

I degraded them to my kitchen knifes after a while, but now they have been replaced with other, and much better hones, for that too.

In my opinion, they are inferior products and poorly made.

Clearly, YMMV :)
03-11-2011, 08:12 AM
Memorael

This is why no one should use DMTC to lap stuff. Its not meant to do so.
03-11-2011, 10:26 AM
SharpMan

Quote:

Originally Posted by Birnando

I have a few of the D8XX diamond plates, the 325, 600 and 1200.
I was very excited to finally receive them, after reading a lot of good reviews of them.

However, my impression of these plates are less than stellar.
They shed diamonds and they leave way too deep scratch patterns for my liking, compared to its relative grit size.

I degraded them to my kitchen knifes after a while, but now they have been replaced with other, and much better hones, for that too.

In my opinion, they are inferior products and poorly made.

Clearly, YMMV :)

I had read about this shedding of diamonds before.

Sharpman
03-11-2011, 04:16 PM
Shoki

Here's a quick photo. It seems to be shinier at the corners and there are small dots of shiny metal showing through. I gave it a scrubbing with cleanser and a nylon brush. It seems cleaner, I'll try it some more tonight when I get back from work.

Thank you,
--Shoki

http://i52.photobucket.com/albums/g3...KW/DMT325C.jpg
03-11-2011, 05:16 PM
JimmyHAD

Rub your fingernail over the shiny spots and compare them to the rest of it. Then rub your fingernail on the untreated underside. You should feel the diamonds cutting your nail if they are there. :gl:
03-11-2011, 05:22 PM
gssixgun

The thumbnail works, I have also used a Glass as you can see the scratches from the diamonds very easily on there _DO NOT_ let the wife catch ya :nono:
03-11-2011, 05:37 PM
gssixgun

Also I realize that some of you guys have trouble with these DMT's but here is a typical day in the life of my DMT 325

Last night and this morning

2 W&B Near wedges
3 Hollow grind Solingen
1 Swaty Barber's hone

Do quick laps on Chosera 1k X 5 then add 3 x more because the one wedge razor really was a bear to set the bevel...
Have to cut a pre-bevel on one of the Hollows using the DMT325 with a drop of soap and water 10 minutes of honing on it

Final finish lapping and Chamfering on the Swaty about 10 minutes of solid work initial work was done on a DMT120

Quick lapping Henckles 1k x5
Quick lapping Henckles 3k x5
Quick lapping Henckles 8k x 5
Quick lapping Select Coticule x5

Cleaning the DMT 325 and the 120 with a stiff Nylon brush and Comet to get the Swaty residue off there...

Dried lightly on a towel and placed back in the cupboard to do 8 razors tonight on the Chosera 1k and the Full Shapton run of 1-2-4-6-8-16-30 x 8 each stone

I have been doing this on this one DMT 325 for 3+ years about 5 days a week averaging 6 razors per day...

So either I have a Magical DMT, you have a total dud, or you did something wrong... I can't say which..
But you can see why I recommend them :) and consider them to be the best workhorse on my honing table...
03-11-2011, 05:49 PM
Shoki

It seems to file my thumbnail and scratch my wife's glasses... (they were her old prescription ones) so I guess it still has some diamonds on it. I never really cleaned it so I think it was loaded up with kitchen knife. I'll give it another go this weekend.

Thanks for the replies everybody.

--Shoki
03-11-2011, 05:59 PM
Snake

Quote:

Originally Posted by gssixgun

So either I have a Magical DMT, you have a total dud, or you did something wrong... I can't say which...

I'm pretty sure you have a Magical DMT.

I asked around, and I have consensus.
03-11-2011, 06:17 PM
gssixgun

:p :p TY Marcos, :beer1: I will now proceed to hone a magical Chronik razor on it, with a magical La deda vein Coticule and have a perfect shave with an edge that only cuts whiskers and not skin ;) ;) whoops I forgot I have to strop it on the $20 (shipped) strop I bought made from "High Quality" leather

Life is good again hehehe

Sorry :OT here guys

Oh I crack myself up sometimes :)
03-11-2011, 08:06 PM
Pete_S

Quote:

Originally Posted by Shoki

Here's a quick photo. It seems to be shinier at the corners and there are small dots of shiny metal showing through. I gave it a scrubbing with cleanser and a nylon brush. It seems cleaner, I'll try it some more tonight when I get back from work.

Thank you,
--Shoki

Were you applying alot pressure to the hones when you were lapping? If so, that could have helped shear the diamonds from the DMTs edges. You pretty much only want to use the hones weight when lapping, though if a stone seems to need alot of work I will put the DMT on top, since its pretty heavy.
03-11-2011, 09:00 PM
Stubear

I use my DMT a lot for both kitchen knives, lapping hones and edge repair and it's still going strong after 2 years. I personally am really pleased with mine and I'll definitely be replacing it when it finally gives up the ghost...! :)
03-12-2011, 02:12 AM
Shoki

Now that it's clean it's working WAY better. I think it was a combination of not cleaning the DMT, pressing to hard, and not using enough water.

Thanks everybody!

--Shoki
03-12-2011, 06:57 AM
infamous

Quote:

Originally Posted by Pete_S

Were you applying alot pressure to the hones when you were lapping? If so, that could have helped shear the diamonds from the DMTs edges. You pretty much only want to use the hones weight when lapping, though if a stone seems to need alot of work I will put the DMT on top, since its pretty heavy.

I agree, use no pressure when lapping, just the weight of the hone. I've never had a problem with my dmt.