The Grand Unified Grit Chart

Discussion in 'Maintenance, Tinkering & Embellishment' started by Komitadjie, Jun 13, 2011.

  1. PG5768


    Apr 28, 2008
    This is one of the great things about BF. The collaboration and sharing of knowledge between folks from all over. Thanks Komitadjie for putting this together and sharing. Clay thanks for sharing your expertise. And finally, thanks to Esav for making this a sticky.
  2. Komitadjie


    May 31, 2011
    Haven't heard anything back from Ben as yet, but one of the guys on another forum helpfully pointed out that I was short a tad bit of the high end on the CAMI system. Chart's been updated to reflect the extra three grits!

  3. zyhano


    Dec 3, 2009
  4. Komitadjie


    May 31, 2011
    Indeed! Feel free to copy my chart into there if you want, that's the REST of what makes a sharpening abrasive what it is. Size is just that, it doesn't actually describe HOW something sharpens. This chart is only for general reference comparison, it doesn't necessarily mean that one stone with a 3 micron grit is going to polish better than another with a 5-micron grit and a totally different set of parameters.

    That's a good writeup, incidentally.
  5. Jason B.

    Jason B. KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jun 13, 2007
    A little correction to the DMT,

    3 micron diapaste is yellow and 1 micron paste is white/gray

    Good work :thumbup:
  6. Komitadjie


    May 31, 2011
  7. proud2deviate


    Apr 5, 2004
    What a wonderful resource! I'll be sure to visit this often, I assure you. Great work, and many thanks!!
  8. Komitadjie


    May 31, 2011
    Another minor update, the EP site posted the grit sizes for the abrasive tapes, so I've updated their position on the chart and changed them from approximations to known values. The new values raise some questions about the grits of the stones shown for the EP, I am attempting to gather more information. So far my inquiries to Ben Dale for the grit sizes of the stock stones and diamond plates have gone unanswered. I also added the approximate values for the Bark River stropping compounds, based on discussions in the Bark River thread on Knifefoums.

    Full View: HERE
  9. marthinus


    Dec 10, 2006
    Thanks for all the effort you are doing with this. Been really helpful!
  10. hardheart


    Sep 19, 2001
    The edge pro stones are made by Boride Abrasives (AS-9, AM-K, CS-HD, according to a Boride manager) and use FEPA standard. DMTs and Norton are graded by mesh. You could throw in micro-mesh as well if you feel like it. How accurate are the Chosera numbers, Naniwa would not tell me the average micron size for their 10 and 12K powders. The Spyderco ceramics do not vary in micron size, it is the firing and surface finish that changes the abrasive nature.
  11. jackknifeh


    Sep 29, 2010
    Very nice chart. Edge Pro now has a 1200 grit stone that isn't on their web site yet, or wasn't last time I looked. You have to call them to order it. I don't know if it is available through any of the other re-sellers of EP products.

  12. Komitadjie


    May 31, 2011
    There's the 1200, and a defunct 800 that I would like to include as well, along with their two diamond plates, and the diamond tape. I just haven't had any luck getting the actual values from Ben. I might take a shot at emailing Boride directly, that might be a good way to deal with it. I was looking at the FEPA-F standard, but my problem with correlating any of them is that with the EP-supplied value for the tapes, the 1K stone looks finer than the tape?

    Possible, it just doesn't make all that much sense to me.
  13. tjiscooler


    Mar 17, 2008
    This is great! Thank you for sharing. This chart answered all my questions.
  14. DocNightfall


    Nov 20, 2006
    Further elucidation of the JIS grits can be found here:
    Note that the rating system no longer follows its roughly geometric progression beyond JIS#8000.
    JIS#10000 is 0.6um
    JIS#15000 is 0.5um
    JIS#20000 is 0.45um
  15. alabamaomi


    Jan 22, 2012
  16. alabamaomi


    Jan 22, 2012
  17. Ocelot85


    Feb 1, 2012
    Awesome resource Komitadjie, thank you for using your time and resources to bring us this information. Earlier I was looking everywhere to find the grit / micron size of a few different products. You've saved me alot of time.
  18. loonybin


    May 18, 1999
    Where do the Lansky stones and diamond hones fall on the chart?
  19. Komitadjie


    May 31, 2011
    You know, I really don't know! I'll have to check on that this evening and perhaps drop them an Email to see if I can find out. I'd like to add them, given how common the system is.

    Anybody have any information on that already?
  20. foxyyy


    Feb 24, 2012

    can you also include where the black, white, green & red polishing compounds fit in? thanks! :)

Share This Page