Thread: Komitadjie's Unified Grit Chart

Hello, gents,

So, I found this grit-microns comparison chart including well-known brands such as Chosera, Shapton, Atoma, DMT and others.

The author is a person from bladeforums.com with the username "Komitadjie" and this chart is referred to as "Komitadjie's Unified Grit Chart" in some sharpening forums (bladeforums.com and chefknivestogoforums.com)

It's available at Google Drive:

https://docs.google.com/spreadsheets...R-o/edit#gid=0

But I actually found it here: https://www.bladeforums.com/threads/...-chart.856708/

It's also mentioned here: https://www.chefknivestogoforums.com....php?f=4&t=196

I'm doing some research on grit/microns for my next honing video when I ran into this chart.

I thought you'd find it useful.

Let me know what you think.

Kind regards,
CoffeeAddict24

Saved it as a PDF.

I can assure you that the Shapton 1K is more abrassive than the Chosera 1K. You can see the difference in microns in that chart.

Originally Posted by CoffeeAddict24

I can assure you that the Shapton 1K is more abrassive than the Chosera 1K. You can see the difference in microns in that chart.

Grit size doesn't equate to abrasiveness. It's a much bigger rabbit hole. Lots to consider. Friability, particle shape, binder, to mention a few factors.

Originally Posted by onimaru55

Grit size doesn't equate to abrasiveness. It's a much bigger rabbit hole. Lots to consider. Friability, particle shape, binder, to mention a few factors.

Maybe, I shouldn't have used the word "abrasive". "Aggresive" or "fast", perhaps?

I have both stones and the Shapton cuts metal much faster than the Chosera 1K.

I've read posts where they mention the Shapton 1K being similar to a Chosera 800.
In the chart the Shapton 1K is given a micron size very close to Chosera 1K only 0.7 micron difference.

Maybe the abrasiveness is not in the micron size but the Shapton does really feel like a faster cutter than the Chosera 1K. It even leaves a somewhat microchipped edge sometimes. I haven't experienced a microchipped edge with the Chosera 1K yet. I've tried both stones on Böker, Dovo, Thiers-Issard and cheap Chinese Gold Dollar razors.

But I can't tell if micron size adds to that feeling or other factors, as you mention, play a bigger role than micron size?

Kind regards,
CoffeeAddict24

The Shaptons were designed to cut hard tool steels & they do cut very deeply so you can get microchipping on razors. Light pressure is crucial when using them.
The Chosera 1k is loaded with abrasive so it cuts reasonably fast too. 2 different animals but yes the Shapton leaves a finish like some 800s.

Consider diamond plates. An 8000 grit dmt leaves very deep scratches which can only be removed by much lower grit stones.
If you sharpen knives with 10 % vanadium and need to cut the carbides, diamonds are a good choice but not so for razors. Horses for courses.

Originally Posted by onimaru55

The Shaptons were designed to cut hard tool steels & they do cut very deeply so you can get microchipping on razors. Light pressure is crucial when using them.
The Chosera 1k is loaded with abrasive so it cuts reasonably fast too. 2 different animals but yes the Shapton leaves a finish like some 800s.

Consider diamond plates. An 8000 grit dmt leaves very deep scratches which can only be removed by much lower grit stones.
If you sharpen knives with 10 % vanadium and need to cut the carbides, diamonds are a good choice but not so for razors. Horses for courses.

Is there any reputable website (being the company's site or any other) or source where I can read about the Shaptons being manufactured for that purpose?

I'm doing a video for my YouTube channel and I'm comparing the Shapton. I'd like a reference to my talk in the video.

Also, I was thinking that the Naniwas and Choseras were designed for kitchen knives? Thanks a lot for sharing what you know.

Originally Posted by CoffeeAddict24

Is there any reputable website (being the company's site or any other) or source where I can read about the Shaptons being manufactured for that purpose?

I'm doing a video for my YouTube channel and I'm comparing the Shapton. I'd like a reference to my talk in the video.

Also, I was thinking that the Naniwas and Choseras were designed for kitchen knives? Thanks a lot for sharing what you know.

I may be wrong about that. I just know that hard stones are preferred for keeping plane & chisel backs flattened. Sigmas & Shaptons do that well.

Slightly softer stones are good for J/Knives as they usually have some convexing.

Originally Posted by onimaru55

I may be wrong about that. I just know that hard stones are preferred for keeping plane & chisel backs flattened. Sigmas & Shaptons do that well.

Slightly softer stones are good for J/Knives as they usually have some convexing.

I understand.

Thanks a lot,
Kind regards,
CoffeeAddict24