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Hexapod racing sim

Discussion in 'DIY Motion Simulator Projects' started by Petertje, May 11, 2020.

  1. hannibal

    hannibal Active Member

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    just do it.
    the amount of work and time for DIY is going to be like buying Thanos..
  2. Petertje

    Petertje “Engineering changes the world.” —Isaac Asimov Gold Contributor

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    Yeah, Its stable, works right out of the box and I like the industrial VFD drives with servo motors since they are bulletproof and powerful. I made some calculations and DC is not even that much cheaper when you consider the power supplies.
  3. BDZ

    BDZ New Member

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    any updates on this absolute beast?
  4. Petertje

    Petertje “Engineering changes the world.” —Isaac Asimov Gold Contributor

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    ah yes, so busy I forgot to keep you all in the loop, sorry for that!

    • We finished the frame with adjustable footrest "ferrary style".
    • Made a control box to contain the VFD drives and thanos. (for those who are paying attention: VFD drives will be mounted with the cooling fins up so picture is wrong)
    • Made a button box for park, on/offline and emergency switch
    • Put the whole thing on a checkered flag floor
    • Finished screen mounts and control interfaces
    Sending it out now to the powercoat factory, in a couple of weeks it should be finished!

    thumbnail_IMG_3256.jpg thumbnail_85852946-30A2-42C3-BDED-276E0A1E9767.jpg IMG_3421.jpg IMG_3420.jpg
    • Like Like x 8
  5. plotto

    plotto New Member Gold Contributor

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    Hi,
    This is a great build. Planning on something similar.
    Are you able to share drawings for your actuators?
  6. Petertje

    Petertje “Engineering changes the world.” —Isaac Asimov Gold Contributor

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    I will, first will update them to implement lessons learned.
    • Like Like x 2
  7. Petertje

    Petertje “Engineering changes the world.” —Isaac Asimov Gold Contributor

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    Finally all the stuff back from the powdercoat company, doing some subassemblies first and will hopefully have it all working this weekend!


    powdercoated.jpg
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  8. Will974

    Will974 Member

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    Fantastic job!!!! I like !!! :thumbs
  9. Will974

    Will974 Member

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    Hi,

    I have a question on one detail of the conception of your linear actuator. I can observe that you don't use slide rode to fix the piston rotation due to the fact that you use u-joint at the bottom and the top of the actuator. So, the piston can rotate if needed . However, i don't understand why the lower part of the piston next to the nut is not guided ? Is there no risk of vibration at high speed ? Wouldn't the guide also improve the positioning of the piston?
  10. Petertje

    Petertje “Engineering changes the world.” —Isaac Asimov Gold Contributor

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    Indeed I dont need to lock against rotation: the u-joints lock the position. Ans since no switches or string pots are used the position doesnt matter/

    When using linear bearings the play is minimal. The piston (rod) is thick walled hardened steel. Not much movement there. There is no noticeable vibration.

    Furthermore, when the rod is extended, that bearing wouldnt be in contact anymore anyway.
  11. Will974

    Will974 Member

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    "Furthermore, when the rod is extended, that bearing wouldnt be in contact anymore anyway."

    What do you mean ?

    Usually, the piston is guide on two points :
    1-At the upper part of the actuator (Linear bearing or self-lubricated ring )
    2-The lower part of the piston ( Not exist for you ) --> and that's what caught my curiosity... :)
    But saw your video, it seems to work very well, with this particular conception :thumbs
    Last edited: Sep 3, 2020
  12. Petertje

    Petertje “Engineering changes the world.” —Isaac Asimov Gold Contributor

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    i'm not sure what you mean. Can you post a sketch of how its should be according to you?
  13. Will974

    Will974 Member

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    Look at photos attached. The piston is guided only at one place. Usually the piston is guided in two places at the same time unlike the fact that rotation is fixed by the two u-joint but not you. Can you explain me your decision to choose to not guide the piston at this place please ? Are you sure that there won't be problem when the rig will be loading ?

    Attached Files:

  14. Petertje

    Petertje “Engineering changes the world.” —Isaac Asimov Gold Contributor

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    Ah I see what you mean. I'm using a long linear ball guiding on a hardened axle with very little play. Works perfectly: no sideways movement and/or vibration is present.
    • Like Like x 1
  15. Petertje

    Petertje “Engineering changes the world.” —Isaac Asimov Gold Contributor

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    Put it all together, quite happy with the result!



    xs14.jpg xs13.jpg xs12.jpg xs11.jpg xs10.jpg xs9.jpg xs8.jpg xs7.jpg xs6.jpg xs5.jpg xs4.jpg xs3.jpg xs2.jpg xs1.jpg
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  16. Dschadu

    Dschadu Member

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    A super clean build, wow! Looks absolutely amazing.
    • Agree Agree x 1
  17. Will974

    Will974 Member

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    Wahou ! The result is awesome !!! Congratulation hug:

    Now we wait for a video of your rig in action !!! :)
    • Agree Agree x 2
    Last edited: Sep 17, 2020
  18. Will974

    Will974 Member

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    Do you build yourself the stand for the triple screen ?
  19. PeterW

    PeterW alias Wickie

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  20. Thanos

    Thanos Building the Future one AC Servo at a time... or 6

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    This is 007 in the "serial-production"... lol

    What are you talking about? o_O