Thread: 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

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.

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.

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.

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. .

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.

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

Sharpman

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

This is why no one should use DMTC to lap stuff. Its not meant to do so.

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