OT For those interested ROBRENS has posted a new video on precision deburing - Page 4
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  1. #61
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    Quote Originally Posted by MattiJ View Post
    AFAIK "ruby" might try to imply finer grit or something superior when its about grinding stones but its really unspecific. Pink aluminium oxide contains tiny bit of chromium oxide that makes it more tough and pink.
    Difference what is called "ruby" and pink aluminium oxide? No idea.
    Aluminium oxide stone could be 12000 grit and ruby stone 36 grit..
    The ruby stones in this Amazon page advertise:
    "The Ruby Sharpening stone is made from sintered crystals of synthetic ruby."
    Maybe this is different from aluminum oxide.

    Anyway Stefan's youtube video on deburring shows these as one of a group of tools to use for this purpose instead of white or pink stones.

  2. #62
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    Just out of curiosity, why not flat grind a ruby stone?

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    Quote Originally Posted by gkoenig View Post
    Just out of curiosity, why not flat grind a ruby stone?
    That is a good question. Maybe smaller pore space (3000 grit) would be an issue when deburring precision surfaces and creating metal particles.
    The India stones converted to precision stones are softer allowing these metal particles to embed themselves in the stone; smoothed out when rubbing two stones together; removed when cleaning the stones. Ruby stones from Gesswein, large enough to be useful are over $325 each. It would be worth diamond grinding one of the wider stones in the $30 kit to see how they work precision deburring metrology instruments. Wiping surfaces with a cloth plus solvent (maybe LPS primer) between honing periods should remove metal particles that would cause a problem (abrasion and uneven honing surface). There are good reasons to use cheap India stones; a single ruby stone would involve a completely different honing process. That's how it appears to me and I have never done any of this but plan on buying the $30 ruby kit next month and grinding one of the 5.5" sticks with a well-used diamond wheel on my surface grinder; will be an imperfect job but most likely an improvement over factory condition.

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    Quote Originally Posted by LFLondon View Post
    They are Norton India double sided stones, used in pairs. The part number is visible in his video. I posted the link to a source for them, probably Amazon.
    Uh, no. Stefan DID NOT use Norton brand stones. Here is a picture directly from his Instagram account, showing the stones he ordered and surface ground.

    He may use Ruby stones for deburring, but this thread is about ground flatstones like what Robin showed.




    Sent from my XT1053 using Tapatalk

  5. #65
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    Quote Originally Posted by Spyderedge View Post
    Uh, no. Stefan DID NOT use Norton brand stones. Here is a picture directly from his Instagram account, showing the stones he ordered and surface ground.

    He may use Ruby stones for deburring, but this thread is about ground flatstones like what Robin showed.
    Yes, Stefan sourced his stones from a German company while Robin's were Norton India stones from MSC (also available from Amazon).
    There is Hoffman USA if you want to order pairs of India stones from them.

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    "Ruby" stones (or any others with pesky embedded steel particles/residue) can be easily cleaned with Bar Keeper's Friend brand cleaner. It contains oxalic acid, which helps to dissolve small particles of steel and loosen them from the stone pretty quickly.

  7. #67
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    Quote Originally Posted by eKretz View Post
    "Ruby" stones (or any others with pesky embedded steel particles/residue) can be easily cleaned with Bar Keeper's Friend brand cleaner. It contains oxalic acid, which helps to dissolve small particles of steel and loosen them from the stone pretty quickly.
    Amazing, just an ordinary consumer product. Naval Jelly with oxalic acid should work too. Or put the stones in a pot of pokeweed root and berries and boil them up.


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