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Showroom 2dof foot mount sim powered by 12v Electric Jacks

Discussion in 'DIY Motion Simulator Projects' started by mariano68, Nov 1, 2015.

  1. mariano68

    mariano68 Active Member

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    It is great to see that I made at least a little contribution to the forum :)
    • Like Like x 2
  2. bsft

    bsft

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    thats not the only place the contribution was made to.....
  3. mariano68

    mariano68 Active Member

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    That's great then!
  4. mariano68

    mariano68 Active Member

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    My Motion Simulator:
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    I will be adding heave to my sim soon, mechanical part is almost resolved, just a question about potentiometer setting. I use SCM3 wich as a default, centers the motors at the start, this is no problem for 2dof, but for the heave movement I will use a spring that it will be getting its center position once I get on the sim, so the only way that the motors won't struggle against the spring, is to power on the heave motor once I get on the sim, but also if the sim is used by another person (different weight) the heave motor will be trying to center the sim all the time. Any advice?
  5. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
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    How have you implemented heave, do you have some pictures or better yet a video?

    I am just in the process of swapping mine over to a 50:1 gearbox for heave, as it can't be back driven.
  6. mariano68

    mariano68 Active Member

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    Not done yet, but the idea is to do a center spring with a guide, and one or two motors with levers, something like this but with two motors:

  7. mariano68

    mariano68 Active Member

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    More like this, but using a lever system like the other video
  8. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
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    When I get the new lever made up and change the gearbox on mine from the 25:1 to the new 50:1 then I will be able to let you know how it compares with a gearbox that can't be back driven.

    On mine the 25:1 could not hold the sim when nobody was on it because of the heave assist spring. Also it was fine for racing but the motor got noticeably warmer when I started to mess with flight sims, particularly long climb outs constantly putting sustained load on the heave motor.
  9. mariano68

    mariano68 Active Member

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    Thanks for your reply.
    I will (I hope) going to Brazil on vacations in 15 days, once I get back I will start working on the heave mech.
  10. Kass55

    Kass55 Member

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    Thanks Mariano68,
    Jack motors look excellent idea for upgrading my wiper motors 2DOF.

    I haven't tried, but could you not use an electric car jack under / welded to the UV joint and use it to give you heave ?
    It lifts cars so strong and stable. So is it too slow ?
    If so, could change gearing ?
  11. mariano68

    mariano68 Active Member

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    Thanks!
    It is too slow, but if it lifts 2000kg with the current gearing, it could be able to do the work with a 1/4 of the reduction (500kg is more than enough).
    If you have access to gearing stuff could be nice to try!
    My current idea to use it for heave is keep the gearing and add a lever.
    9.jpg
  12. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
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    I am very pleased with the 50:1. As it can't be back driven it has no problems holding the sim when unloaded against the heave spring. Speed wise performance is still good

    The only down side is that the 50:1 comes with a large 8mm bolt hole through the otherwise solid shaft, which I was a bit concerned weakens the shaft. I had a local machine shop turn up a very think walled interference fit lever tube for me so the shaft is supported as much as possible.
  13. mariano68

    mariano68 Active Member

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    Good idea @noorbeast
    The Jacks motor can't hold if not powered, but it is not much of a problem.