Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

How To?

  1. May 22, 2005 #1
    How To????????

    OK...these days I play TT (table tennis) and by mistake I "chibbed" my table tennis ball by mistakedly putting my foot over it..Its a normal white coloured light ball.... and a part of the sphere has went into it..(know what i mean?)

    Now ... Can anyone please tell me how am i gonna fix it? ...I have bought some new balls...but just as a physic psycho, I want to fix it... Probably it is too hard for me to blow air and to re-inflate it... any methods?
     
  2. jcsd
  3. May 22, 2005 #2

    JamesU

    User Avatar
    Gold Member

    Stick a needle inside and push the dent out
     
  4. May 22, 2005 #3

    brewnog

    User Avatar
    Science Advisor
    Gold Member

    Submerge it in boiling water for a few moments.
     
  5. May 22, 2005 #4
    I think what we want is some knid of pressure from inside..remember its relatively strong plastic.... boiling will either do nothing..or probably expand it...without doing anything to the dent..
     
  6. May 22, 2005 #5

    brewnog

    User Avatar
    Science Advisor
    Gold Member

    Nope, I've been there and done it. I had a thumb-print sized dent. Holding it under boiling water for a few minutes just popped the dent back out again. Trust me, I'm an engineer...
     
  7. May 22, 2005 #6

    cronxeh

    User Avatar
    Gold Member

    put it in vacuum

    Edit: the inside air pressure should have max air pressure points on the dent and evenly distributed on the curved sides, so the dent will be pushed out until its uniform with the rest of the ball, and then the ball will crack depending on the young's modulus for that material

    yes, you should just dip it into boiling water - cheaper :rofl:
     
    Last edited: May 22, 2005
  8. May 22, 2005 #7

    PerennialII

    User Avatar
    Science Advisor
    Gold Member

    Brewies thing works well .... an 'industrial version' of it is applied for example in welding and when repairing dented/buckled plates etc. (well, pretty much the same idea, the same principle the very least).
     
  9. May 25, 2005 #8

    minger

    User Avatar
    Science Advisor

    As someone who plays beerpong quite frequently, boiling does in fact work wonders. For small dents, you can even sometimes hold a lighter up to it (not too close or it will "blister"). However, you would be quite surprised how large dents can be fixed with boiling.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: How To?
  1. Robot how? (Replies: 5)

  2. How was F=qvB derived? (Replies: 1)

  3. How do holograms work? (Replies: 9)

Loading...