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Thread: O-rings

  1. #1
    Banned Groundhog66's Avatar
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    Default O-rings

    I have an assortment of lights, I would like to get a nice supply of O-riings for them. I have McLuxIII, PD-S (Ti & HA Alum), XR19-C, 27LT-S. Can anyone help me cover my bases for all sizes needed, thanks.

    Tim

  2. #2
    *Flashaholic* easilyled's Avatar
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    Default Re: O-rings

    Have you checked the sticky threads in the McGizmo forum?

    eg. "McGizmo products overview" etc.

    I think that information can be found in them, although it may take
    a little bit of tracking down.

    Bernie (Kiessling) has compiled very useful & comprehensive notes
    & great pictures to illustrate the outer and inner parts of all of
    Don's lights.
    In layman's terms, "theory" means an idea. However "scientific theory" is fact because it requires proof.

  3. #3
    Banned Groundhog66's Avatar
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    Default Re: O-rings

    Quote Originally Posted by easilyled
    Have you checked the sticky threads in the McGizmo forum?

    eg. "McGizmo products overview" etc.

    I think that information can be found in them, although it may take
    a little bit of tracking down.

    Bernie (Kiessling) has compiled very useful & comprehensive notes
    & great pictures to illustrate the outer and inner parts of all of
    Don's lights.
    Yes, I checked that out. But I could not locate the specs for most of the lights. Thank you for the response.

    Tim

  4. #4

    Default Re: O-rings

    Speaking of O Rings...what size does he use between the lens and the head in the 27LT-S? I picked up a bezel from James and it resulted in a slightly loose lens. I couldn't find an exact fit from any at the hardware store...so I settled for one that is too fat but at least the lens doesn't rattle. It's not right though and I'd like to get it perfect. Any ideas? I'm thinking I may have to spring for the O-Ring assortment from MSC...
    --Peter

  5. #5
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    Default Re: O-rings

    Try post #27 in this thread:

    http://www.candlepowerforums.com/vb/...d.php?t=147672

    Don goes through the O-rings sizes/types for all his creations

    Hope that helps.

  6. #6
    *Flashaholic* easilyled's Avatar
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    Default Re: O-rings

    Quote Originally Posted by GRoLED
    Try post #27 in this thread:

    http://www.candlepowerforums.com/vb/...d.php?t=147672

    Don goes through the O-rings sizes/types for all his creations

    Hope that helps.
    That's a great help thanks.

    Maybe the info. should be added to the "McGizmo Product Overview" sticky
    thread?
    In layman's terms, "theory" means an idea. However "scientific theory" is fact because it requires proof.

  7. #7
    Banned Groundhog66's Avatar
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    Default Re: O-rings

    ++1

  8. #8
    *Flashaholic* PoliceScannerMan's Avatar
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    Default Re: O-rings

    Save ya'll a link click, heres post #27 linked above....

    Quote Originally Posted by McGizmo
    Hi guys,

    I will be repeating some info here.

    On the XR19-C

    O-rings:
    XR-19 Head:
    Window seal - #019 EPDM (or the GID silicone)
    Head to pak seal - #017 Silicone (red)

    C pak:
    Boot Seal O-ring - #016 Silicone (red)
    Boot & Seal Retaining O-ring - #113 EPDM

    XR27 & S27 Head:

    Window Seal O-ring - 2 x 22 mm Buna (Nitrile)
    Window retaining O-ring - #025 EPDM
    Head to pak Seal - #017 Silicone (red)

    27LT & 27LT-S head:

    Window Seal - #023 EPDM
    2x head to Pak seal - #017 Silicone

    PD Piston:
    Piston to sleeve seal - #015 Silicone (use #016 for added protection but stiffer activation)

    PD head:

    Window Seal O-ring - #019 EPDM
    Head to sleeve seal O-ring - #017 Silicone


    *******

    Now as far as lubes go, there are incompatabilities galore.
    Silicone seems to work with most synthetics and most silicone greases. Petroleum based lubes can be a problem.
    EPDM is good with all silicone greases and most synthetics that I am aware of. YMMV

    If you get an O-ring from the hardware store, it is most likely Buna or Nitrile. I don't like to use this material but had to for size in the seal for the 27XR and 27S heads. It is OK as a seal and should it crack, you will see this. I couldn't find the metric O-ring in silicone or EPDM which I would have preferred. Buna (Nitrile) is subject to O-zone degradation, big time! If the material is kept lubed then you are OK. I have seen these in static, dry applications where they have failed. I encountered one in the guts of a SF a few years back that was in 4 pieces!

  9. #9
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    Default Re: O-rings

    Peter,

    I think you would need a slightly thicker than standard size for the 27LT-S. There's a microscopic difference in the light's physical spec that sometimes results in a loose fit for James' bezel rings (which were designed/created for the 27LT). Good luck in finding the answer though... I have the same combo and have asked this o-ring question before... Perhaps no one really knows?

    Chelly

  10. #10
    *Flashaholic* McGizmo's Avatar
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    Default Re: O-rings

    Hi guys.Thanks for digging that info up. I recalled that I had posted it somewhere but that was as far as my memory went. If you have a situation where a "dash" size O-ring of 1/16" is a bit too thin, you may find a metric, 2 mm thick O-ring that can fix the problem. That is what I ran into with the Ti 27 heads.
    Build Prices .... some mods and builds (not 4 sale) "Nature can be cruel- but we don't have to be."~ Temple Grandin

  11. #11
    Banned Groundhog66's Avatar
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    Default Re: O-rings

    Why can't I find silicone in all the sizes, are they just not available? What is the next best option, I was shopping at the SS

  12. #12
    *Flashaholic* McGizmo's Avatar
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    Default Re: O-rings

    Tim,

    I know that Wayne and Cindy have attempted to provide a service by stocking some of the common O-rings but it would be insane to try to handle all and in all flavors.

    In quantity, the source I use is Air-Oil and they have the full range of O-rings in silicone.
    Build Prices .... some mods and builds (not 4 sale) "Nature can be cruel- but we don't have to be."~ Temple Grandin

  13. #13
    Banned Groundhog66's Avatar
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    Default Re: O-rings

    HOLY SMOKE, now I am really confused....;o)

  14. #14
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    Default Re: O-rings

    Cheers PSM, that's a much better idea.

    It was late....

  15. #15
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    Default Re: O-rings

    Info added to the FAQ thread. Good call guys!!!
    There is a type of perfection that transcends the quest for lumens. Buying a $250 1-cell light for "lum factor" is like buying a $250 single malt Scotch for the alcohol content.
    - paulr


    It's always darkest just before it goes pitch black.
    My shoes are too tight. But it doesn't matter, because I have forgotten how to dance.

  16. #16
    Banned Groundhog66's Avatar
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    Default Re: O-rings

    Quote Originally Posted by Kiessling
    Info added to the FAQ thread. Good call guys!!!

    +1

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