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Jumpy Problem and Motor Synchronization

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Sam Neall, Feb 28, 2020.

  1. Sam Neall

    Sam Neall Member

    Joined:
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    My Motion Simulator:
    2DOF, DC motor, Arduino, Motion platform
    So I have another problem. Luckily I got the motors to move and connect to simtools. Finally making some progress. I’ve messed around with smoothing parameters in axis filters but I can’t get it to not be jumpy. I can reduce the axis percentage and that smooths it out pretty well but then it doesn’t have enough power to move the setup. Another problem, which I’m more concerned with, is that there are delays up to a second between axis testing and my simulator. For some reason sometimes it moves according to the slider, but sometimes it takes up to a second to actually do anything. The motors also lose synchronization sometimes (one moves while the other doesn’t). Sometimes The synchronization problem is so bad that motor 2 just stops working. I’m not sure why it is motor to, but that one seems to have the most problems. I will move it to a low position (not anywhere near clipping limits) and it will just stay there. When I try to adjust roll and pitch, the other motor is the only one that moves. I end up having to load up SMC3 again so that motor 2 can go back up to the center position because simtools won’t tell it to do so. I took a video of it here
  2. Ads Master

    Ads Master

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  3. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

    Joined:
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    Innovative tech specialist for NGOs
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    +8,760 / 42 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    Starting a new thread instead of posting everything on your build thread makes it nearly impossible for members to help without spending time hunting down possible issues.

    For example, having the uni joint at the base instead of directly under the seat is a significant design flaw, which will put a huge strain on the motors: https://www.xsimulator.net/community/faq/universal-joint-placement.108/

    [​IMG]

    Your rig also needs to be properly balanced: https://www.xsimulator.net/communit...-of-gravity-to-balance-a-motion-simulator.55/

    And you need to have properly dialed in SMC3 first, then the motion profile before messing with filters. So please post pictures of both on your build thread, so all of the information is in one place.

    You can grab the SimTools manual here: https://simtools.us/wp-content/uploads/2019/06/SimToolsUserManual-v2.4.pdf

    And here are handy tips on how to refine a motion profile: https://www.xsimulator.net/community/faq/steps-to-create-a-motion-profile.228/