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TOPIC: Confused by 3 micron diamond stones

Confused by 3 micron diamond stones 2 months 2 weeks ago #18302

  • bleomycin
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Hi everyone,

I'm still very new to sharpening in general, I purchased the 3 micron diamond stone set thinking it would be the place to go after 1200/1600 ceramics, I used this grit table as my logic for that decision: www.gessweincanada.com/category-s/11328.htm

Unfortunately i'm missing something fairly obvious because the 3 micron stone scratches the crap out of the blade when used after the 1200/1600 ceramics. At what point am I supposed to be using it, and why does something that is ~8000 grit causing so much damage? Thanks!
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Confused by 3 micron diamond stones 2 months 2 weeks ago #18326

  • mark76
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I haven't used these stones yet, so I cannot comment from experience.

Are you sure your stones are worn in? How many times have you used them?

A general tip: try to use light pressure, particularly with newer stones. And diamond stones will often give a somewhat coarser scratch pattern, compared to waterstones and ceramic stones, because of the way they work.
Last Edit: 2 months 2 weeks ago by mark76.
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Confused by 3 micron diamond stones 2 months 2 weeks ago #18329

  • blacksheep25
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I bought a pair of these to try out. Agreed they'll need to be broken in. And they appear coarser than the 1200/1600 ceramics. My one and only knife sharpened on the 3 micron is a spyderco delica; it was a touch up, 3 micron only then stropped. The only odd thing I noticed were the scratch marks on the face of the 3 microns, looks like they are from the knife.

About a dozen pics in my photobucket album (sharpening). Here is just one of those pics:

Last Edit: 2 months 2 weeks ago by blacksheep25.
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Confused by 3 micron diamond stones 2 months 2 weeks ago #18330

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blacksheep25 wrote:
The only odd thing I noticed were the scratch marks on the face of the 3 microns, looks like they are from the knife.

About a dozen pics in my photobucket album (sharpening). Here is just one of those pics:


This looks pretty weird to me. I've never seen that on a diamond stone. Can you see what is scratched? Is it something with the diamonds or is it the backing material?
Last Edit: 2 months 2 weeks ago by mark76.
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Confused by 3 micron diamond stones 2 months 2 weeks ago #18333

  • bleomycin
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The stones are very new, i've only run them for a few minutes on my zdp-189 manbug. Should I run them for a while on an old junky chef knife just to try and break them in?
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Confused by 3 micron diamond stones 2 months 2 weeks ago #18335

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Yes, all diamond stones need to break in. I have no experience with the 3 mu stones, but I'd say the other diamond stones take about 5-10 knives to get broken in. Maybe slightly less if all of your knives are made of ZDP-189 :-) .
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Confused by 3 micron diamond stones 2 months 2 weeks ago #18351

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Good point Blacksheep. I wonder where these fit into the progression? Maybe they do need to come before ceramics?
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Confused by 3 micron diamond stones 2 months 2 weeks ago #18355

  • 5string
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The July WE Newsletter says this about the 3 Micron diamond stones:

"They are designed to remove scratches left by the coarser diamond stones and further the refinement of your edge."

When I bought my 3 Micron diamond stones I had the same idea as bleomycin, that they would fill the 3 micron niche. In my nimrod mind, it seemed logical but found the grit chart is not linear, at least with respect to the substrates. To illustrate that, a 3 Micron diamond stone leaves a totally different scratch pattern from 3 micron lapping film, which is different still from a 3 micron diamond paste strop. I've started using the following progression: diamond stones, ceramic stones, lapping films, then strops. As I get more experience I may understand this concept better.

My 3 Micron diamond stones have the same scratches as bleomycin's, having been used on 4-5 knives.

photo.JPG
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Confused by 3 micron diamond stones 2 months 2 weeks ago #18356

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Interesting discussion. What I know from other stones is that their grit listing is not always accurate (and often difficult due to the various grit systems and the various ways in which different types of stones work). For example, the micro fine ceramic stones are listed as 1.4/0.6 mu, but if we judge them on their scratch patterns, they seem more coarse (see here).

blacksheep25 wrote:
I bought a pair of these to try out. Agreed they'll need to be broken in. And they appear coarser than the 1200/1600 ceramics.

How do they compare to the 1000 grit diamond stones? Do they seem finer?

For now I'd make sure the stones get well worn in. Clay should be back in about a week and I'm interested in his experiences with and opninion on these stones. (One of the things he also wanted to do was to make a new grit comparison list with photos that includes the new stones.)
Last Edit: 2 months 2 weeks ago by mark76.
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Confused by 3 micron diamond stones 2 months 2 weeks ago #18383

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Very nice write-up on the micro fine ceramic stones. What did you use to take the pictures of the scratch patterns? They're outstanding.
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