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    Username Post: sharpening stone grit sizes/comparisons        (Topic#763651)
    yuzuha
    Master Member KnifeNut!
    *
    03-21-06 15:41.42 - Post#888480    



    People keep asking about how the grit sizes of stones compare so, I thought I'd start a link/info page. Post links, comparisons, stone/sharpener reviews.

    Japanese waterstones use JIS (Japanese Industrial Standard) for grading abrasives.
    HERE is a chart showing the grit number and the average particle size in microns (millionths of a meter... for comparison the wavelength of red light is about 0.7 microns and blue light is about 0.4 microns). It also gives the range and error margins... i.e. a 1000 grit stone is 11.5 microns with a 1 micron error so half the particles fall between 10.5 and 12.5 microns. The rest of the numbers specify that only 3% of the particles can be bigger than 27 microns or smaller than 7 microns, and no single particle can be bigger than 32 microns or the batch can be rejected, though most Japanese manufacturers have tighter controls than the standards allow for). If I remember correctly the Shapton cream stone is 0.96 microns and their purple stone (30,000 grit) is about 0.4 microns. Generally you can guess the micron size pretty close by dividing 12500 by the JIS grit.

    Here is a chart for DMT diamond plates DMT color code

    A grit chart for diamond dust/paste diamond polish

    A grit chart for Micro-mesh polishing papers micromesh

    A comparison of different grit standards comparison chart (note, the sizes for JIS grits in this table are based on the old sedimentation tube method of measuring and are larger than the ones in my table)

    A catch-all chart showing a little bit of everything A comparison of grit sizes of belts, wheels, stones and hones used in knifemaking, sharpening and woodworking.

    Cbwx34's handy little comparison chart http://www.knifeforums.com/uploads/1136390328-ShrpnrCmpre4.JPG

    A chart for Arkansas stones Dan's whetstones

    Quietone's US / JIS grit chart http://www.knifeforums.com/uploads/1136458983-GritMicronJIS.gif

    The grit sizes for Norton's India, Crystalon and waterstones are on page 2 of their PDF catalog Norton's stone catalog

    Pam a.k.a. 柚子葉
    Sue ikki
    mi hatenu yume no
    hotsure kana
    ---Choko

    (This final scene, I
    I will not see to the end.
    My dream is fraying.)


     


    C_Dawg
    Master Member KnifeNut!
    *
    03-22-06 05:55.29 - Post#888831    


        In response to yuzuha

    cool, thanks pam!

    i've got a few to add, too, i guess.


    this one has it all, with belt comparasons, 3m abrasives, even scotch brite pads! i like this one:

    http://users.ameritech.net/knives/grits.htm


    hmm, the others i have are either lost or the same ones as pam. oh well. hope you guys like the one i have : )
    C-Dawg
    "The falling leaf does not hate the wind."


     
    yuzuha
    Master Member KnifeNut!
    *
    05-09-06 13:13.54 - Post#926006    


        In response to C_Dawg

    Here is another grit chart I put together including Shapton's new "glass stone" grit sizes (the Shapton calculated values are based on a formula derived from their glass stone sizes 14700/grit#) I also color coded it to show what grits they have available in pro and glass. I also included standard JIS values based on the old sedimentation tube method and the electrical resistance method (sans all the error values) and Norton's grit sizes from their catalog (though I'm told they produce a finer finish than you'd guess from their particle sizes)

    http://members.cox.net/~yuzuha/jisgrit1.html

    Pam a.k.a. 柚子葉
    Sue ikki
    mi hatenu yume no
    hotsure kana
    ---Choko

    (This final scene, I
    I will not see to the end.
    My dream is fraying.)


     
    yuzuha
    Master Member KnifeNut!
    *
    05-11-06 11:53.35 - Post#927937    


        In response to Fish_n_Poi

    Yeah, that is my old table that only shows the new JIS with all the error margins and statistical information.

    The one I posted above is a new one that I just made that has all the shapton stones, the old JIS and the new JIS numbers, DMT and Norton stones on it.
    Pam a.k.a. 柚子葉
    Sue ikki
    mi hatenu yume no
    hotsure kana
    ---Choko

    (This final scene, I
    I will not see to the end.
    My dream is fraying.)


     
    Fish_n_Poi
    Master Member KnifeNut!
    *
    05-11-06 12:07.29 - Post#927948    


        In response to yuzuha

    Thanks Pam I was just doing some seaching and found that. I didn't know you had already posted it. I'll delete it.

    Fish
    Getting a handle on things.


     
    allumirati
    Master Member KnifeNut!
    *
    06-11-07 16:32.28 - Post#1249398    


        In response to Fish_n_Poi

    Interestingly by the charts the Norton 8k shows 3 microns while it is advertised on some sites as 1.2 micron.
     
    joe_c
    Master Member KnifeNut!
    *
    06-11-07 23:20.26 - Post#1249495    


        In response to allumirati

    The Nortons 8K is about 3 microns.

    Joe


     
    allumirati
    Master Member KnifeNut!
    *
    06-12-07 02:59.40 - Post#1249616    


        In response to joe_c

    So it's really comparable to a japanese 4k stone...would this make it unsuitable for a final finish if you were looking for a exeedingly sharp edge?
     
    joe_c
    Master Member KnifeNut!
    *
    sharpening stone grit sizes/comparisons
    06-12-07 06:57.18 - Post#1249806    


        In response to allumirati

    There seems to be different micron sizes listed at different sites. All I can tell you is the 8K norton give a very high smooth shine to the edge.

    The 4K and 8K stones are finish stones with the 8K more of a mirror finish than a 4K regardless of who makes it really.

    Norton's Grit as listed at:

    Tools For Wood Working
    220 = 65 micron
    1000= 14 micron
    4000= 3 micron
    8000= 1.2 micron

    Craftsman Studio
    220 = 65 micron
    1000= 14 micron
    4000= 6 micron
    8000= 3 micron

    Norton doesn't list micron sizes in their catalog at all that I can find. Both sites sell the same stones I might add.

    Joe




    Edited by joe_c on 06-12-07 06:57.52. Reason for edit: No reason given.
     
    jagstyle
    Master Member KnifeNut!
    *
    06-12-07 08:05.19 - Post#1249856    


        In response to allumirati

    • allumirati Said:
    So it's really comparable to a japanese 4k stone...would this make it unsuitable for a final finish if you were looking for a exeedingly sharp edge?



    the norton 8k can definitely produce an "exeedingly sharp edge". On a small (in width) bevel it looks and feels fully refined (polished). Should you desire a sharper edge, it works great to jump from the norton to a chromium oxide charged substrate (I use leather). Finer stones are not necessary unless you desire a full polish on a wide bevel and in that case the naniwa 10k works marvelously.
    Eric


     


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