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O-Ring Grooves

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  • O-Ring Grooves

    I need to make some special fittings to allow rotation between parts aprox 1/2" dia. with normal water pressure (Max 75 psi). How would you machine the groove if it were on the od of the piece or if it were on the face of a flange surface? How critical are the dimensions at these conditions?
    Byron Boucher
    Burnet, TX

  • #2
    Will this help?

    This might help:
    http://www.applerubber.com/

    http://www.google.com.au/search?hl=e...e+Search&meta=

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    • #3
      This is called a dynamic seal.
      Go to the Parker web site.
      You do need a dynamic seal if things move like shafts or couplings.
      Paulf

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      • #4
        Originally posted by Boucher
        I need to make some special fittings to allow rotation between parts aprox 1/2" dia. with normal water pressure (Max 75 psi). How would you machine the groove if it were on the od of the piece or if it were on the face of a flange surface? How critical are the dimensions at these conditions?
        O-rings will work nicely. Rubbing surfaces need to be very smooth to prevent quick wear; reducing the diameter of the o-ring will reduce velocity, producing longer life. Groove finish is also important to prevent rapid wear.

        Groove dimensions aren't super critical at low pressures, holding .005 tolerances is pretty easy w/ a lathe bit ground to the right size. Clearance
        between rubbing parts should be small - no more than .003" or so, or
        the O-ring gets squeezed into the gap.

        Keep in mind the consequences of failure vs cost of perfection; a leak in a lawn sprinkler is less critical than a computer water cooling system :-).

        http://www.efunda.com/designstandard...ring_intro.cfm

        - Bart
        Bart Smaalders
        http://smaalders.net/barts

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