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Heelllppppp...Ceramic Ball Stuck in Stop Pin Recess

Discussion in 'Maintenance, Tinkering & Embellishment' started by Sharperthansticks, Jul 28, 2019.

  1. razorburn

    razorburn Gold Member Gold Member

    Mar 26, 2007
    Do you have one of those diamond coated disks mounted on a mandrel usually included in those rotary tool kit.You could try grinding a flat spot on the ceramic ball so you can use your center punch,but I am pretty sure there will be a point where the disk will almost stop grinding.Another option is a belt grinder with a coarse grit belt.

    As for a center punch, if you have some small diameter high carbon steel drill rods like O1.If so,you could make a hardened pointed punch,provided it is hardened and tempered right should be more than plenty to pulverize that ceramic ball.Held in some vise grip.

    Also have you tried smashing the ceramic balls with a large hammer and an anvil
     
  2. Sharperthansticks

    Sharperthansticks Gold Member Gold Member

    Sep 19, 2017
    @Backyard , @tiguy7 and @razorburn :

    It's true that I didn't think about the fact that abrasion resistance and impact resistance are often inverses of each other. These are, after all, the analogs of edge retention and toughness, which tend to invert when one is maximized (absolutely, not locally maximized)! In other words, duhhh; I should have thought of that.

    I was told that an automatic center punch should do the trick; that's what the knifemaker I consulted with uses when this happens to him. I may use my Beast DMT diamond block to flatten out the top of the ball just a little bit to reduce the possibility of the punch rolling on to the side of the titanium scale, though

    Previously I tried whacking one of those balls with a hammer, but it just sunk into the 2x4 under it (that I was using for testing purposes), and results on my kitchen counter weren't any better. The far higher PSI from a punch will likely be much more effective.

    So, the punch from Amazon should come tomorrow. Fingers crossed.
     
  3. Tjstampa

    Tjstampa Gold Member Gold Member Basic Member

    63
    Mar 25, 2019
    I used a pair if nippers once. The blade edge put more force in one place then a plier would. Also I would think a nail punch would shatter it, but I could be wrong.

    Another thought heat the scale then soak in water. The expansion might let some water in. Then freeze to see if the water would expand enough to push it out.
     
  4. Blues Bender

    Blues Bender Gold Member Gold Member

    Feb 27, 2014
    @Sharperthansticks

    Go get a can of keyboard duster, the compressed air stuff. If you hold the can upside down and spray it, it will spray a really cold gas (like -60°). Do this, and get the ceramic ball really cold, then whack the titanium slab against something. Should come right out;)
     
    kreisler and WValtakis like this.
  5. razorburn

    razorburn Gold Member Gold Member

    Mar 26, 2007
    I was looking at your pics again.It looks to be only 40% the way in.Your could try gripping the ball with a pair of end cut pliers.Otherwise clamp it down and try knocking it out at the scale with a slotted screwdriver and hammer
     
    kreisler likes this.
  6. kreisler

    kreisler

    306
    May 11, 2012
    prying with a sharp blade (plus hammer) could work?
     
  7. Tjstampa

    Tjstampa Gold Member Gold Member Basic Member

    63
    Mar 25, 2019
    Another though I had was cover it with gorilla tape paying attention to make sure the ceramic ball is covered as much as possible then try pulling it off
     
  8. Sharperthansticks

    Sharperthansticks Gold Member Gold Member

    Sep 19, 2017
    It took 5-10 minutes of smashing that little sucker, gradually wearing him away, but the punch that came from Amazon worked. (Last night I tried a cheaper, less forceful punch that I already own; it didn't work worth a damn. This $10 tool from Amazon was the perfect tool for the job.) The saga is over!

    [​IMG]
     
  9. Mistman68

    Mistman68 Gold Member Gold Member

    128
    Apr 7, 2019
    Bet you won't be doing that again. Man, glad that finally worked out, I was wondering what the outcome would be, the longer this thread got the more I wondered.

    Good job!
     
  10. Sharperthansticks

    Sharperthansticks Gold Member Gold Member

    Sep 19, 2017
    Actually, now that I know how to get the media out and I have the tool to do it, I'm not really concerned if it happens again or not. Oh, and thanks! :)
     
  11. Getting older

    Getting older

    229
    Jan 3, 2016
    That would seat the ball deeper
     

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