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The Grand Unified Grit Chart

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

  1. Komitadjie


    May 31, 2011
    Unfortunately, I can't do much that way. The number of compounds that fit into those general colours, and the variety of grit sizes within those compounds are MASSIVE. There really *is* no defined grit number for, say "green" compound.
  2. blackhorse16a


    Apr 26, 2012
    This chart is GREAT! Is there a way I can get it in excel or other spreadsheet format?

    Thax, BH
  3. Bill_Mead


    Mar 19, 2002
    Thank you Komitadjie for putting this together and sharing, very useful.
  4. Komitadjie


    May 31, 2011
    Sure, drop me an email and I'll toss you an XLS version to play with.

    And thanks, guys. :)
  5. loonybin

    loonybin Gold Member Gold Member

    May 18, 1999
    Since some folks have recommended Congress Tools's "Moldmaster" stones for the Edge Pro, I contacted them and asked about their stones. Their response:

  6. Komitadjie


    May 31, 2011
    Updated with Moldmaster Info, thanks!

    Last edited: May 28, 2012
  7. Lagrangian


    Jun 25, 2011
    Hi Komitadjie, loonybin,

    Thanks for the update to the Grand Unified Grit Chart! :)
    I own some Moldmaster stones, so it's nice to see them in the GUGC.

  8. loonybin

    loonybin Gold Member Gold Member

    May 18, 1999
    How do you think the compare to the EP stones? I ordered 120, 240, 400, and 600, but didn't realize that the 600 was such a large micron size. If I had known that, I would have ordered the 320 instead of the 400 to basically split the difference between the 240 and the 600.

    Komitadjie, I'm a little confused on the EP list, as you have the #2000 listed as a larger micron than the #1000. Is the 2000grit tape a higher micron size than the 1000grit stone?

    Also, I've emailed him back asking for micron size for their Orange EDM, Ruby and Flex stones as well.
  9. Komitadjie


    May 31, 2011
    I WISH I had a decent answer on that one, Loonybin! I've been trying to get a SOLID answer on the EP grit sizes since I started this chart, and I haven't been able to actually get any solid information. I don't think Ben Dale actually knows, at least he hasn't responded to my queries on the topic. The numbers on the tapes come from the EP website, so I'm at least a bit more confident on those. The numbers I have for the EP stones come from an older spreadsheet that I incorporated right back at the beginning of this. I honestly suspect that the numbers listed there are quite a lot coarser than reality, based on how they cut.
  10. loonybin

    loonybin Gold Member Gold Member

    May 18, 1999
    Next question: Moldmaster 240 grit stone is 60 micron, and the EP 220 grit stone is 63 micron. Since the micron size is basically the same, will the Moldmaster stone cut better due to being SiC instead of AO, or will the EP stone still cut better due to being larger micron size?

    Also, your latest full size image doesn't work.
    Last edited: May 27, 2012
  11. Komitadjie


    May 31, 2011
    Should be fixed... that was odd, even in the IS account it won't load... but it DID when I put it up. Odd.

    The three-micron difference likely isn't going to matter THAT much, although I have no empirical evidence to back that up.
  12. loonybin

    loonybin Gold Member Gold Member

    May 18, 1999
    So the Moldmaster stone should cut better because it's SiC, then?
  13. Komitadjie


    May 31, 2011
    I would think so, the SiC is likely to both cut and break down a little faster... I've never played with the Moldmasters myself, so I really can't give a definitive answer. I'd sure be interested in finding out, though!
  14. hardheart


    Sep 19, 2001
    Email Betsi Burns, the sales and product manager at Boride.
    Last edited: May 29, 2012
  15. Komitadjie


    May 31, 2011
    The FEPA-F standard WOULD make a fair bit of sense, given that a number of people have commented that the listed values are quite a bit coarser than the stones actually cut...

    I'll update the chart when I get home this evening, that might finally clear some of that mess up. I must have just completely missed your first posting of that, sorry. :)
  16. tikkidaddy


    Jan 1, 2012
    And on the 8th day God created a grit chart...and used you to do it...Do you have any idea how many times ive asked myself these questions...
  17. Komitadjie


    May 31, 2011
    Hey, glad it's helped 'ya out! :)

    New revision, I've re-sorted the EdgePro stock stones to reflect the response from Boride that they are FEPA-F graded. This casts some doubt on the numbers for the tapes, given that the 2K tape is now considerably more coarse than the 1K stone... So I've moved the tapes to approximate values.

  18. hardheart


    Sep 19, 2001
    You may want to make the Spyderco values approximate, they are all 20+ micron sized particles, and the difference in cutting action is from binders, firing processes and surface finishes. You would have similar micron equivalency issues if you added natural stones.
  19. aznpos531

    aznpos531 I like sharp and pointy things...

    Dec 12, 2010
    First of all, thank you Komitadjie and all the contributors for making this chart. It's been very helpful in selecting stones for myself.
    Couple questions about this chart.

    Are the grit v.s. micron sizes still more or less the same for the Shapton Glass Stones versus the older Pro Series Stones?

    Does anyone know what is the approximate grit size is for the Spyderco diamond rods?

  20. Komitadjie


    May 31, 2011
    Glad it can help 'ya out!

    I haven't heard a solid micron size given for the Spyderco diamonds as yet, unfortunately. It seems that the spyderco stuff in general is very hard to grade. The next revision of the chart will list them as approximate values, I think. I BELIEVE the sizes are roughly the same between the Pro and Glass, although they cut very, very differently due to binder changes as I understand.

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