Tennis Ball repressurizer

Discussion in 'Modding' started by czman863, Jul 26, 2010.

  1. czman863

    czman863 Member

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    Saw a thread before with this idea. So i am thinking of actually making one. I got all the main parts.

    I just need some advice in how i should go about sealing the PVC pipe

    The outer diameter of PVC pipe is 160mm and inner diameter is 151mm. I got 2 caps which are screwable (but i have tried everything to undo them and its not coming off). If anyone know where i can get a massive spanner or the tools i need to unscrew this cap it would be great :)

    But for now since it is so hard to unscrew the caps i dont know if it will be such a great idea to actually fix both the caps onto the PVC pipe with PVC cement. So i am thinking of fixing one cap into place and leave the other one to just pull off when i need to access the balls.

    So i need to buy some o-rings 160mm diameter 4mm wide (if someone could tell me where to buy some that would be great).

    The metal rods and plates are used to ensure the caps dont blow off when i pump it up to 30 psi


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  2. shmity

    shmity Member

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    Use a moto tie down/ratched strap to get your caps undone, like a massive jar opener.
     
  3. caspian

    caspian Member

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    cut a big spanner out of some 1/2" marine ply.
     
  4. Dodge M4S

    Dodge M4S Member

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    Try using a oil filter remover.
     
  5. ford ftw

    ford ftw Member

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    +1 Exactly what i was thinking.
     
  6. The Mafia

    The Mafia Member

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    where did you buy those green tennis balls from?
     
  7. SeaBiscuit

    SeaBiscuit Member

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    how is the project going man, in the end would it be less then getting a commercial pressurizer?

    but nothing beats building it yourself though.
     
  8. Al3x

    Al3x Member

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    don't you mean yellow? :D

    Also, how does this actually work?
     
  9. SeaBiscuit

    SeaBiscuit Member

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    Tennis balls are made with an internal pressure of 14 PSI and packaged in a pressurized can. Pressure is released when you open the can. Once this occurs pressure inside the ball will now escape through it's porous rubber. During play each time you hit the ball it will force the internal pressure out even more.

    so hopefully with a pressurized container we can extend or restore some bounce.
     
    Last edited: Jul 29, 2010
  10. bonox

    bonox Member

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    basic pvc pipe splits very nicely, but the burst pressure is quite high. Be aware that there is a thick walled pressure pipe variation and a thin walled drain pipe spec.

    The cement and fittings are rated for use on the same pipe and if you do it correctly with full joint overlap you won't need the steel frame.

    6" pipe @ DSTM 2466 is 560psi

    http://www.engineeringtoolbox.com/pvc-cpvc-pipes-pressures-d_796.html

    ahh - and the important bit - the plumbing place who sold you the pipe and fittings should also carry the seals to go with it.
     
  11. Duff Man

    Duff Man Member

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    I remember you use to be able to buy something similar form KMART around 20 years ago. They were great. I used to play every morning and arvy and the balls would stay fresh for at least amonth or so. Do they still sell them these days?

    Good luck with the mod anyway:thumbup:
     
  12. Rogue_Elefant

    Rogue_Elefant Member

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    why dont you just get the tennis balls that dont go flat.

    Tretorn X Tennis Balls are awesome and last a very very long time. They will bounce like new for years, just don't let them get wet for too long.

    (dry them in front of a heater if they do get wet)
     
  13. bonox

    bonox Member

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  14. AMLagonda

    AMLagonda Member

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    My old man had a tennis ball pressurized pump tube thingy whats it, had a hand pump on the top, bought from a sports store, this was 20 years ago...
     
  15. OP
    OP
    czman863

    czman863 Member

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    Lol they not green. Pretty sure its just normal dunlop tennis balls

    I got 2 of those. O ring seal died after like half a year and the caps are bulging so yeah not very good quality...

    DAM they had these things 20 years ago. Why dont they sell it now? why they do but its like 250 bucks http://www.strictlytennis.net/ballcharger.htm
     
  16. AMLagonda

    AMLagonda Member

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    I wasnt being sarcastic.... the one we had had room for three balls, those are huge...
     
  17. OP
    OP
    czman863

    czman863 Member

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