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Thread: Looking for a rotary joint, no idea what its called :)

  1. #1
    Join Date
    Aug 2007
    Location
    Hertfordshire, England
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    1,373

    Default Looking for a rotary joint, no idea what its called :)

    I have a shaft that rotates slowly, about 30rpm, I need to pull that shaft in and out with an air cylinder.

    Any idea what that joint or coupling might be called??

    Searching but cant get the right name, i'm sure its an available part??

  2. #2
    Join Date
    Sep 2017
    Location
    Poulsbo, WA
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    22

    Default

    Swivel ??
    Ball Joint ??
    Universal Joint ??
    Wobbly-Clyde ??

    Be_Zero_Be

  3. #3
    Join Date
    Oct 2013
    Location
    Setubal, Portugal
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    392

    Default

    could use s gearbox type fork. Easy to make, a groove in the shaft and the fork on the cylinder
    Helder Ferreira
    Setúbal, Portugal

  4. #4
    Join Date
    Aug 2007
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    Hertfordshire, England
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    Default

    Yes it will need to be something like that, i just rang SMC pneumatics sales and there is no off-the-shelf coupling that takes rotary motion as well as lateral.

    Fork/groove might work ok though.

  5. #5
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    Jun 2007
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    Anderson SC
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    Default

    Look at "rotary unions" IF I follow your description correctly

  6. #6
    Join Date
    Jan 2002
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    Huntsville Ala
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    Default

    "linear actuator" is one term, but I don't know if that could encompass rotary motion.

  7. #7
    Join Date
    Aug 2007
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    Hertfordshire, England
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    Default

    Thanks all, rotary union bought up some interesting stuff but that term seems to mean passing fluid through the rotary joint - we only need a mechanical joint.

    Linear actuator brings up actual motion devices i'm afraid

    Maybe linear rotary joint, will check

  8. #8
    Join Date
    Aug 2013
    Location
    Schwenksville, PA
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    333

    Default

    spline drive?

  9. #9
    Join Date
    Aug 2007
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    Hertfordshire, England
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    Default

    No, that would transmit the rotation - we need to pull/push the rotating shaft with a stationary shaft

  10. #10

    Default

    You mean like a bearing block that the inner race grubscrew's or fixes onto the rotating shaft, and the block flange attaches the stationary shaft?
    If there's a commercial part especially for that, be interested to know. I made my own from a bearing and some machined flanges for the air shifter on my dragbike's gearbox, but my shaft rotated at 500 rpm.

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