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Compact Full frame, 2Dof with TL

Discussion in 'DIY Motion Simulator Projects' started by Rav3n87, Sep 23, 2020.

  1. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Gas struts have their pros and cons, read on from here to get a sense of the range of associated views and potential issues: https://www.xsimulator.net/community/threads/2dof-motion-simulator-build.6196/page-7#post-88210
  2. absyfadhel1

    absyfadhel1 Member

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    I have same problem as you , i have jerky motion when moving slow but at fast movment its great.

    so i want to add gas struts on front but i dont know how much nm should i buy like 100nm or more?, so if you add gas struts can you tell me if its helped you or not and which one have you installed?
  3. Rav3n87

    Rav3n87 Active Member

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    H
    Hi Mate,

    I have a few other issues to sort out atm, I have twist in my uni joint which is not helping the overall jerkyness, I will be rectifying that issue first and will retest to see how much improvement i get and go from there, I have some short 100n struts at home and they feel like they would almost be too strong depending on where they are mounted, when i get a chance i grab some for testing

    Thanks
  4. absyfadhel1

    absyfadhel1 Member

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    I have also twist on my rig shaft, i will check if i can make it stable, i check some post that maybe you need to add Motorcycle steering damper, like this



    but its to expinsive on my country about 120$ each one, also from the orginal site they dont ship to me .and i'm afraid to purchase it and not give any help.

    Thanks
  5. Rav3n87

    Rav3n87 Active Member

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    Yeah i saw those dampener units, I think they would work quite well to smoothen it up, but yes expensive!
  6. Rav3n87

    Rav3n87 Active Member

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    Update time...

    Oki doki now before I strip this thing and give up would somebody like to have a look at my photos and shed a bit of light on how I can fix/mask the backlash, other than the backlash it's feels great albeit needs a bit more refining in simtools but its close, I simply cannot and will not live with this bloody backlash!! It's off-putting and uncomfortable, turn it up no change turn it down no change, tried gas struts...nooopee that's a garbage idea, funnily enough slows the movement down to the point motors get hot when they are opening! Can't win!

    I'd like to think I'm reasonably smart and capable person but I'm at the end of my rope!

    Video also
    https://youtube.com/shorts/rojw_WAZw00?feature=share

    Attached Files:

  7. Radje748

    Radje748 New Member Gold Contributor

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    This play is in several motors I have tested.... the way I solved it (almost)... is a combination of gas struts and springs between the up and down section to keep pressure on the motor arm....(but had to play to find the best position)....
    It is still there, but less notionable....
  8. itsumairu

    itsumairu Active Member

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    hello there. I really wanna know if the damper is significantly improve the motion, because its been a while I want to add this damper to my rig.
    especially because I find the cheaper damper on my country, for only $9 each.
    bee8d8b5-4d32-4c5c-9bc1-53a6e5115bf3.jpg
  9. absyfadhel1

    absyfadhel1 Member

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    This is DOFREALITY option so i think it can help with backlash , i call them and ask about backlash and they offer me two option :

    1. use damper (100$)
    dumpers.png

    2 : use SFU gearbox upgarde that can remove backlash completely (200$/1pcs)
    sfu-1024x747.png


    https://dofreality.com/options/


    this is cheap damper
    https://www.aliexpress.com/item/330...!sea!BH!1855950368&curPageLogUid=yUQpksmbEEvW
  10. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Backlash is common in wormdrives, this is about average: https://www.xsimulator.net/community/faq/wormdrive-backlash.293/

    The longer the leavers and inherent rig design leverage the more pronounced backlash is.

    A little bit of positive weight bias will help mask the back lash.

    Obviously you have more backlash in one wormdrive than the other, what you may consider doing is if they are new talk to the supplier, and if not open up the wormdrive.

    You will note only a small amount of the gear is repeatedly used for whatever lever range you are using, and it can wear the gear teeth, brass teeth can actually spread. So you could try moving the gear wheel and lever so you are using a fresh unworn part of the gear and see if that helps.
  11. Rav3n87

    Rav3n87 Active Member

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    Do you have any Photos of how you (almost) solved it?

    I contacted DOF reality and for me to use the SFU Gearboxes i would need 24v motors from them or someone else if i can find out exactly what they are


    Thanks Noorbeast, I have read the backlash Faq before, i understand that with longer leavers it is more pronounced, what do you mean by: "inherent rig design leverage" In my photos is there something you can see that would add to the problem?

    Yeah both of them are new from motion dynamics not sure why it has more backlash now than the other, They were both rather tight to begin with, perhaps i will open it up again and inspect,

    Not sure about adding more weight it does seem like a reasonable amount on them already, Roughly how much would you think you have on yours?

    Cheers all
  12. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    What I mean is that with a foot design rig, like yours, using fairly long levers that exacerbate backlash, the long design leverage distance from the motors emphasises that backlash even further. On a compact rig like mine a shorter CTC lever is used, there is still backlash but it is minimised.

    A small amount of positive weight bias may help, how much relates to the design, my compact rig uses just a tiny amount.

    You can actually hear the backlash of my compact rig at the extreme of motion here, but if you watch the top of the seat there is very little real impact on the actual motion, which remains fairly controlled: