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Question Actuator parts sourcing

Discussion in 'Motor actuators and drivers' started by Mike voltin, Sep 17, 2025 at 04:35.

  1. Mike voltin

    Mike voltin New Member

    Joined:
    Sep 9, 2025
    Messages:
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    Balance:
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    My Motion Simulator:
    6DOF
    New here and building a 6-DoF Stewart platform. I’ve read the DIY actuator threads, but many are dated and parts sourcing is tough. I’m looking for U.S. sources for two items:

    precision hollow shaft to sleeve a 1605/1610 ball screw. (main moving part of the actuator)
    • ID: >16 mm minimum (ideally large enough to clear the ball screw nut)
    • Type: seamless/precision shafting (not welded tube)
    • Length: ~800 mm (for ~500 mm stroke)
    • Material: steel, stainless, aluminum, or carbon fiber
    • Price context: U.S. quotes ≈ $300 each, which seems high but this is what I get when searching for "hollow shaft"
    Any U.S. sources or alternatives you recommend?

    Also, some use linear bearing at the top of the actuator housing (where the shaft comes out from) but others simply have a plastic sleave through which the shaft slides.

    Any opinions on which approach is better?

    I am attached few pictures from the forum to illustrate what parts I am referring to. Thank you

    Attached Files:

    Mike voltin, Sep 17, 2025 at 04:35
    #1