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Thread: O-Rings

  1. #1
    Insider
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    O-Rings

    I’m looking for technical resources for design criteria for the use of o-rings; can anyone point me in a direction to get me started?

  2. #2
    Insider new ion?'s Avatar
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    what are you looking for specifically?

  3. #3
    Insider
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    Uhm, for which use? Note, paintball tolerences are a bit different then, say, ANSI spec.

    You are looking for tolerences, right? Or something else?

    Groove design?

    http://www.ponnmachine.com/groove_design.html
    http://www.allorings.com/gland_dynam...iprocating.htm
    http://www.allorings.com/gland_static_radial.htm
    http://www.oringsusa.com/html/gland_design.html

    Here: http://www.parker.com/literature/ORD...g_Handbook.pdf

    262 pages, huge pdf, but there is a ton of info in there.

    Enjoy! And if you need to get some sleep, it works also.

  4. #4
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    Use any of those resources if you want parts that perform horribly

    Paintball glands tend to be more in the 5% crush range and fill a higher percentage of the groove

  5. #5
    Insider
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    This is for paintball...

  6. #6
    Insider
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    And you are looking for groove designs, right?

    Better just spill what info you need - we can guess all around and take all day. Which we generally like to do.

    Don't need dims, your design or anything, pick out some o-rings you are looking for and pressures about what you are running at and we can go from there.

    I had to find it, wing it, and then build it and see what I liked to figure it out myself. Like we said, paintball isn't standard, so the more info you give us the better we can do to dial them in for you, or at least give you some rules of thumb.

    And do you have calipers and a paintball gun? Best place to look to figure it out.
    Last edited by pbjosh; 03-27-2013 at 06:12 PM.

  7. #7
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    I started out thinking it would be more of a general question, let me gather my questions and post again.

  8. #8
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    I started out thinking it would be more of a general question.
    I did also! Ha! Feel free to ask though - our lesson are yours.

  9. #9
    Quote Originally Posted by Lurker27 View Post
    Use any of those resources if you want parts that perform horribly

    Paintball glands tend to be more in the 5% crush range and fill a higher percentage of the groove
    The Parker book, in particular, still has a lot of excellent information in it despite their recommended dimensions for dynamic applications being off for many of our needs.

  10. #10
    Insider
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    OK, how about this:
    Buna-N
    Air passage through center
    1500 psi max
    Sealing surface top and bottom
    Compressed between two surfaces, no gap
    Machined cavity both sides
    What percentage increase in cavity diameter?
    What percentage decrease in cavity depth in respect to o-ring width?

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