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Thread: Advice on purchasing a coticule

  1. #21
    Senior Member xiaotuzi's Avatar
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    Congrats! Put the time into learning your stone and practicing - you will be happy you did. You will end up wanting more coticules Enjoy the stone, looking forward to hearing how the honing goes.
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    "Go easy"

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    Senior Member dinnermint's Avatar
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    Congrats!

    The prep that has worked best for me is to lap on 400 grit, then take the slurry stone and GENTLY rub the surface under running water, with the stone vertical. I like to use firgure 8 strokes and try to cover the surface of the stone evenly.

    I usually take a 12k naniwa edge (or 8k, I have stone so I use it) and then do 50 to 100 laps.

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  4. #23
    Previously lost, now "Pasturized" kaptain_zero's Avatar
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    dinnermint makes an excellent point that I too have followed.

    I NEVER use a diamond plate for raising slurry on a coticule, only another piece of coticule as a slurry stone. Why? Coticules are made from larger garnet crystals (think glass) and sharp shards of diamond will easily fragment those garnets, leaving sharp pieces in the slurry or sticking out of the substrate. Gently using a cotigura (small coticule hone meant for raising a slurry) will be more likely to release the garnets from the substrate without harm and it is their round soccer ball shape that makes them work so well. I have no proof of course, but it seems to work for me, so that's my theory.

    I do use a diamond plate to initially flatten a coticule (I did it once, maybe 15 years ago) and after that I have cleaned the surface with a cotigura and only use that for cleaning, raising a slurry or refreshing the surface. My coticule is rather hard and does not seem to auto slurry like many of them do, so it has not dished on me. But even if it did, it would have a long way to go based on the old hones we occasionally find that were used until they looked like a saddle.

    Regards

    Christian
    "Aw nuts, now I can't remember what I forgot!" --- Kaptain "Champion of lost causes" Zero

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    Quote Originally Posted by kaptain_zero View Post
    dinnermint makes an excellent point that I too have followed.

    I NEVER use a diamond plate for raising slurry on a coticule, only another piece of coticule as a slurry stone. Why? Coticules are made from larger garnet crystals (think glass) and sharp shards of diamond will easily fragment those garnets, leaving sharp pieces in the slurry or sticking out of the substrate. Gently using a cotigura (small coticule hone meant for raising a slurry) will be more likely to release the garnets from the substrate without harm and it is their round soccer ball shape that makes them work so well. I have no proof of course, but it seems to work for me, so that's my theory.

    I do use a diamond plate to initially flatten a coticule (I did it once, maybe 15 years ago) and after that I have cleaned the surface with a cotigura and only use that for cleaning, raising a slurry or refreshing the surface. My coticule is rather hard and does not seem to auto slurry like many of them do, so it has not dished on me. But even if it did, it would have a long way to go based on the old hones we occasionally find that were used until they looked like a saddle.

    Regards

    Christian
    I do remember reading and seeing a magnification of the garnets when broken up with a DN vs coti slurry stone. It was advised not to use a DN for slurry, though many do and either don't notice a difference or don't know the difference.
    It is in the article grinding and honing part4 belgian whetstones.
    Last edited by rideon66; 07-31-2017 at 01:00 PM.

  6. #25
    Senior Member Paul76's Avatar
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    On my other stones I've only used sandpaper since at the time I didn't have a diamond plate, and that info is a good reason not to use one on the coti either. Generally I used 600 grit sandpaper followed by 1000 grit for the later stones.

  7. #26
    Senior Member blabbermouth
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    Quote Originally Posted by kaptain_zero View Post
    dinnermint makes an excellent point that I too have followed.

    I NEVER use a diamond plate for raising slurry on a coticule, only another piece of coticule as a slurry stone. Why? Coticules are made from larger garnet crystals (think glass) and sharp shards of diamond will easily fragment those garnets, leaving sharp pieces in the slurry or sticking out of the substrate. Gently using a cotigura (small coticule hone meant for raising a slurry) will be more likely to release the garnets from the substrate without harm and it is their round soccer ball shape that makes them work so well. I have no proof of course, but it seems to work for me, so that's my theory.

    I do use a diamond plate to initially flatten a coticule (I did it once, maybe 15 years ago) and after that I have cleaned the surface with a cotigura and only use that for cleaning, raising a slurry or refreshing the surface. My coticule is rather hard and does not seem to auto slurry like many of them do, so it has not dished on me. But even if it did, it would have a long way to go based on the old hones we occasionally find that were used until they looked like a saddle.

    Regards

    Christian
    Now I kind of wonder if that isn't why my coticule is extraordinarily upset with me. Tried taking an edge up to 12K, then bumping over to my coti. Shave was awful. I lapped it flat with a diamond lapping plate, then 'burnished' it with the rubbing stone to get rid of the scratches. Maybe I still have broken garnets exposed. Hmmm...now the question is, how do I go about fixing that. Might be worthwhile to scrub it with the rubbing stone some tonight under running water.
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  8. #27
    illegitimum non carborundum Utopian's Avatar
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    Quote Originally Posted by Marshal View Post
    Now I kind of wonder if that isn't why my coticule is extraordinarily upset with me. Tried taking an edge up to 12K, then bumping over to my coti. Shave was awful. I lapped it flat with a diamond lapping plate, then 'burnished' it with the rubbing stone to get rid of the scratches. Maybe I still have broken garnets exposed. Hmmm...now the question is, how do I go about fixing that. Might be worthwhile to scrub it with the rubbing stone some tonight under running water.
    Just keep using it the right way and over time it will forgive you.
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  9. #28
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    After lapping a coticule will be more aggressive and faster. It will calm down with some use and using the slurry stone under running water can help tame it again.
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  10. #29
    Senior Member blabbermouth Dieseld's Avatar
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    OK, dang it!!!!

    Now you made me buy one

    This place is FULL of enablers...................
    Look sharp and smell nice for the ladies.~~~Benz

    ~~Dave~~

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  12. #30
    Senior Member blabbermouth
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    Quote Originally Posted by Dieseld View Post
    OK, dang it!!!!

    Now you made me buy one

    This place is FULL of enablers...................
    Shoulda waited until I got home and finished messing with my coticule so I could tell you I hate these @#$% rocks.
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