Can't Get Diamond Cup Wheel Off Of Grinder

Discussion in 'Shower & bathtub Forum & Blog' started by DavidSeon, Aug 27, 2012.

  1. DavidSeon

    DavidSeon New Member

    Messages:
    47
    Location:
    MS Gulf Coast
    I'm hoping this is close enough to a Shower & Tub question -

    I used a diamond cup wheel for the first time to remove adhesive residue on a concrete bathroom floor. It is a 4 1/2" double row spin-on DeWalt DW4774, so it doesn't use the backing flange, lock nut and wrench all my other wheels use. It worked like a charm but now I can't get the darn thing off!

    Is there a trick or a special tool for this? It seems like it's going to take a lot of leverage but I don't know whether to grab it by the holes or the segments or what. I hate to damage or unbalance it, they ain't cheap!

    Thanks for any help.

    Dave
  2. DonL

    DonL Jack of all trades

    Messages:
    3,812
    Location:
    Houston, TX
    Maybe it has a Left-hand thread ?

    You can put it against a piece of wood to hold the blade.
  3. DavidSeon

    DavidSeon New Member

    Messages:
    47
    Location:
    MS Gulf Coast
    Thanks, but I'm afraid it is right-handed. There are flats on the top of the wheel but there's not enough space between the wheel and the dust extraction shroud to get a wrench on it.
  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,806
    Location:
    New England
    On some, the shroud can be removed making access possible. Some grinders come with a custom wrench that has an offset in it, and it's thin enough to get to the flats. I've no idea where mine is, and if yours had one, you may not know either!

    If you can put a wrench on the cup anywhere, then use a mallet to give it a whack. Just make sure you're unloosening it!
  5. DavidSeon

    DavidSeon New Member

    Messages:
    47
    Location:
    MS Gulf Coast
    Preparations for hurricane Isaac have temporarily interrupted my project but I did double-check the exposed spindle threads with the grinder's lock nut, the threads are indeed right-handed. A section of the shroud is removable, but my wrench is the dual-pin type and the pins keep it from getting to the flats. I think you're right, I'm just going to have to whack it with something.

    Thanks for your reply.
    Dave
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,806
    Location:
    New England
    You need a sharp impact to loosen it - something that is applied faster than the inertia of the motor shaft to get it to start to spin off. That's easier if you have a lever functionally making the cup larger in diameter (i.e., the wrench sticking out).
  7. DonL

    DonL Jack of all trades

    Messages:
    3,812
    Location:
    Houston, TX
    It would be nice if they all had a shaft lock.
  8. johnfrwhipple

    johnfrwhipple I love these ACO Shower Drains - Best in Class

    Messages:
    3,787
    Location:
    North Vancouver, BC
    OMG - I love it. Sometimes to only tool needed in the tool box is a really big hammer. Personally I'd whack it with my 2" Spanner.

    Before smashing it is it possible to put the cup wheel in a vice and then press the lock pin and twist the grinder? I have had hole saw bits stick on me that have never come off, and trust me they have been Whacked and Whacked.

    What about a little heat on the cup wheel?

    If it resorts to blows then make sure you hit it in the right spot. It is very hard to get leverage clamping to a round fitting.

    JW
  9. DavidSeon

    DavidSeon New Member

    Messages:
    47
    Location:
    MS Gulf Coast
    Whacked it with one of my special tools.

    Sledgehammer.jpg

    Bosch suggested I use one of their wheels that are unthreaded and take the usual flange and lock nut. I suggested they send me a sample to test. He laughed.

    Oh well, probably not the last novice mistake I'll make. Thanks for the replies.
  10. dlarrivee

    dlarrivee New Member

    Messages:
    1,172
    Location:
    Canada
    Just put some gloves on and put a little muscle into it. If you're having problems like this, maybe working with tools isn't for you.
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