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Question JRK motor running at max duty cycle

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Watchumacallit, Jun 30, 2023.

  1. Watchumacallit

    Watchumacallit BMET- Lead

    Joined:
    Oct 16, 2018
    Messages:
    76
    Occupation:
    Biomedical Engineer
    Location:
    Las Vegas, NV
    Balance:
    66Coins
    Ratings:
    +70 / 2 / -0
    My Motion Simulator:
    2DOF, JRK
    Hello All,

    So I recently replaced my worm gearbox to a 60:1 ratio from a 50:1 ratio. Bought it from Motion Dynamics. My old gearbox had plastic gears that broke. I’m running the JRK G2 18v19 with a 12v 180w motor paired with a 12v 400w PSU. I was able to run the 50:1 without any issues but now with the 60:1, I get a motor running at max duty cycle when adding additional pressure like hitting the brakes. Moves fine when I’m just sitting on it. Do I need a bigger motor? I’ve seen builds with the same motor and gearbox work just fine like Noorbeast’s build.
    Watchumacallit, Jun 30, 2023
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
    Messages:
    21,183
    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    148,778Coins
    Ratings:
    +10,915 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    That sounds like something may be binding.

    Do the 60:1s rotate properly if hooked up directly to a 12v PSU, with the rods to the rig disconnected?

    My 200w motors have driven my 60:1s for many years.
    noorbeast, Jun 30, 2023
    #2
  3. Watchumacallit

    Watchumacallit BMET- Lead

    Joined:
    Oct 16, 2018
    Messages:
    76
    Occupation:
    Biomedical Engineer
    Location:
    Las Vegas, NV
    Balance:
    66Coins
    Ratings:
    +70 / 2 / -0
    My Motion Simulator:
    2DOF, JRK
    Just tested directly to the 12v PSU and it spins perfectly fine. No binding whatsoever.
    Watchumacallit, Jun 30, 2023
    #3