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CBN Wheel Cleaning

Discussion in 'Woodturning Discussion Forum' started by William Rogers, Sep 15, 2017.

  1. john lucas

    john lucas

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    I make my wooden angle jigs out of 1/4 plywood and also do the final touch up by touching the wheel. I only have 1/4" or so of wood touching the wheel because I cut out an arc in the middle so that only 2 small areas touch the wood. I have not had a problem with the wood loading the CBN wheel at all. My jigs sort of resemble the Raptor jigs although I started making them about 10 years before the Raptor. I modified Mike Darlow's really fancy jig to come up with mine.
    the very beginning of this video shows my jigs.

    View: https://www.youtube.com/watch?v=Xbggxj2kgyc&t=41s
     
  2. Emiliano Achaval

    Emiliano Achaval

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    Never occurred to me to teach beginners how to safely use my Baldor grinder, but I just added something to the list of safety things... Let's hope that the streak goes away, I hate to see it there....
     
  3. Emiliano Achaval

    Emiliano Achaval

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    When Mike Mahoney stopped by to visit me last year, he showed me his grind, same as the Batty grind, so I call it the Mahoney grind, lol.
     
  4. john lucas

    john lucas

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    I thought Mike's grind was little different than Stewarts. On Mike's tools he has a very short main bevel that is 40 degrees (same as Stewarts) but he uses the Wolverine Jig. Stewart uses a flat tool rest and rotates the tool by hand starting with the flute pointing toward the wheel but at 40 degrees to the wheel. This gives a different wing than the Wolverine and leaves a longer bevel. I could easily be wrong since it's been a while since I've seen Mike Demo. They will both be at our Symposium at the end of this month so I will try to remember to ask them.
     
  5. Paul Gilbert

    Paul Gilbert

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    Aluminum is an amphoteric metal, which is a big word for a metal that is soluble in both acid and alkali solutions. Mix up a strong solution of Lye - (sodium hydroxide - drain cleaner) and soak the wheel. The ferrous metals will not be affected, but the aluminum will be dissolved and may even give off some bubbles in the process.
     
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  6. hockenbery

    hockenbery AAW Advisor Staff Member

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    My CBN wheel is aluminum so ..... this would be a bad thing to do on aluminum wheels??
     
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  7. john lucas

    john lucas

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    Al took the words right out of my mouth. I have a steel CBN from Dave but was thinking about buying another one from Ken and his are aluminum. Of course I typically don't grind aluminum on my CBN but it's good to know that cleaning them with Sodium Hydroxide would be a bad thing.
     
  8. Bill Boehme

    Bill Boehme Administrator Staff Member

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    I would also be concerned about how the lye affects the plating metal that is used to bind the CBN crystals to the wheel. I know that caustic oven cleaners can erode the brazing used on carbide tipped saw blades. Maybe I'll let somebody else be the first to try using lye to clean CBN wheels.
     
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  9. Gerald Lawrence

    Gerald Lawrence

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    Wonder if that cleaning fluid that Trend makes would help.
     
  10. Emiliano Achaval

    Emiliano Achaval

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    I never seen the Stuart grind in person.. But, Mike did the same thing as you did, all by hand, no jig. He set my rest at "about" 45 and did the wings and bevel. He added you can't get that grind especially on the sides with a jig....
     
  11. Emiliano Achaval

    Emiliano Achaval

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    Best idea yet! You are sure I won’t melt my wheel? Lol. Thanks for,the help. Aloha
     
  12. Zach LaPerriere

    Zach LaPerriere

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    This raises an interesting question I have...though it is a genuine digression. I notice a difference between the wheels I have from Dave and those from Ken. Has anyone done any testing or comparison in quality between CBN grit, bonding, and durability between brands?
     
  13. robo hippy

    robo hippy

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    There were some comments about Ken's wheels when they first came out and would the CBN electroplating hold up as well on the aluminum as it does on the steel. I have never heard of any problems that way, and by now, I doubt it is a problem. I have a set of wheels from Dave which have to be 6 or 7 or more years old, can't remember. They barely cut any more, but with exact angles on my platform, it matters little. I need to put a full new set on one of my other grinders and compare. I did that a bit on my shear scraping video, and the new 80 grit CBN wheel left some tear out, and a coarser surface than the old worn out CBN wheel. Maybe another case for taking a 1000X photo of two wheels of the same grit and compare, both new and old wheels. I only have the fine wheels from Ken and not the 180 or 80.

    The Trend lapping fluid will put a lot of the sludge off of your wheels. I regularly apply some of it to my bevels with a twisted pipe cleaner (in my platform sharpening video), which works better than pouring a few drops on the wheel and smearing it around with my fingers. I would always get a racing stripe on my smock. Dave did used to soak his wheels in kerosene, which would loosen up a lot of crud. Ajax or Comet work as well. Never tried oven cleaner though which is supposed to work well on that black baked on stuff that can get on your table saw blades...

    robo hippy
     
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  14. Emiliano Achaval

    Emiliano Achaval

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    Definitely a good safety lesson! I'm surprised that never happened to me all these years... I sharpened a nice big NRS several times today, maybe a little bit of the aluminum came off... I think I will try the Drano...
     
  15. Bill Boehme

    Bill Boehme Administrator Staff Member

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    Definitely don't use Drano because in addition to the sodium hydroxide it has a bunch of other unwanted ingredients depending upon which type of Drano product you get. For example the Drano Professional Strength Crystals Clog Remover is about half sodium nitrate and about 5% flakes of aluminum that are there mainly to put on a big show with lots of fizzing and foaming and obviously reduced effectiveness on dissolving the aluminum on the CBN wheel as well as the possibility of discoloring the wheel from residue left behind. Some of the liquid Drano products are mostly sodium hypochlorite (same thing as household laundry bleach except stronger). It would be better to get pure sodium hydroxide ... a low cost plain Jane drain cleaner called Rooto is just sodium hydroxide crystals and less than a third of the cost of Drano. There are several Rooto products ... don't get the liquid stuff because it is buffered sulfuric acid. Here is a picture of the one that you would want to get in order to get 100% sodium hydroxide.

    image.jpeg

    It's also the same chemical that I use for bleaching box elder to a snow white color.

    When I was first looking for 100% lye a couple years ago, I bought a product called Insta-Flo Drain Cleaner and discovered that it was not what I wanted because it contains metallic flakes and other unwanted junk.

    If it were my CBN wheel, I would just leave things alone. The aluminum isn't hurting anything and will probably eventually wear away. You're nearly as bad as I was about getting a smudge on my Robust lathe when some CA glue dripped on it. :D
     
  16. Emiliano Achaval

    Emiliano Achaval

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    Lol, yes, My baldor 8 in grinder plus 2 cbn wheel from David Dway Schweitzer cost as much as some decent entry level lathes. I hate to see the streak on one... I will leave it alone for now, seem to be working... But, I will look for the lye, Thanks! Aloha
     

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