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2DOF with traction Swedish style project

Discussion in 'DIY Motion Simulator Projects' started by Fredrik J, Jun 1, 2015.

  1. Fredrik J

    Fredrik J Member

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    When you have no skills in CAD or something like it.
    What does a man do then ? ???
    He rediscovers the best buidling material ever invented!!!!

    Friggin LEGO BLOCKS!!!!
  2. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    • Like Like x 1
  3. Fredrik J

    Fredrik J Member

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    Went to my mechanic friend and he think its doable!!!
    All in all it will be a 3 piece construction, Base in wood of some firm material MDF or similar, midframe with lazysusan in front and integrated heavyload ballbearing wheels in the frame(for the traction) plus traction motor. And upper cageframe as a mooving platform, we estimate it´s weight to about 20 to 30kgs finished then with me wheel pedals shifter and mabey 3 screens 150kgs. Might be a little to much for the 2 60:1 motors but i think they will be fine to what ive read on the forums.

    It will be rather compact 160cm times 70cm with a 15cm traction travel from side to side.....we will probably get going on the frame this weekend.
    cheers
    here is a lill simple layout

    Attached Files:

  4. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    Sorry I am not sure from the drawing how you intend mounting the motors and how they will be connected to the seat. Can you explain a little more of what you have in mind.
  5. Fredrik J

    Fredrik J Member

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    I didnt explain it well did i :).
    The whole upper frame will be a platform like yours but heavier ofcourse, so my thought is motors go underneath it connected to the middleframe to save space. Then the middle frame will be suppored by the lazy susan ring and the wheels to roll on the bottom plate to get the traction loss motion.
    I thought about the seatshaker but saw that i probably could do it like this and still have it compact.
    Sorry for my lousy drawings i hope you can bare with me ;)
  6. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    I guess I need another drawing say from the side labeling the motors and rods to understand what you have in mind.

    You will need much more leverage than my sim with greater mass to move plus screens, which is why I am trying to clarify your motor and rod placement.
  7. Fredrik J

    Fredrik J Member

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    Im not rembrandt but here you go :)
    20150615_154335[1].jpg 20150615_154345[1].jpg
  8. Fredrik J

    Fredrik J Member

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    Ah it turned out upside down and fuzzy!!!
    the bottom plate is just a fixing point for the lazysusan and for the wheels to roll on so to speak.
    Not drawn here though
  9. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    Some design aspect for you to consider to further maximise leverage, as I think you are likely to need it.

    20150615_154335[1].jpg
  10. Fredrik J

    Fredrik J Member

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    I can moove the pushrods over COG easy as there will be a frame in the back behind the chair, just need to weld a bracket or a bolt to hold the joint
    So i think i need 60 or 70 CTC levers if so.
    The motors can be mooved forward aswell as there is space for them, if i understand that would make the stress less on the motors?
  11. Fredrik J

    Fredrik J Member

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    Grrr i hate to be a newb :), am searching for the info on how to calculate moovement and CTC and more.
    I know ive seen it but now my head is spinning like a carousel after looking around. I need to learn where and what to look after!! Even thou ive bookmarked loads of post with info i missed that one!
    Would come in handy to calculate my build to see if its possible with weight and all

    Freddie
  12. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
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    Here is a basic intro to linear speed, torque and leverage considerations: http://www.xsimulator.net/community/faq/calculating-basic-linear-speed-and-forces.89/

    It pays to start looking for answers in the FAQs, there is a lot of information there: http://www.xsimulator.net/community/faq/

    The FAQs are split into sections, so you can find a lot of information about building in the Building Resources section: http://www.xsimulator.net/community/faq/building-resources.12/category

    There are also FAQ sections for JRKs and Arduinos and Moto Monsters, depending on what you plan to use.
    Last edited: Jun 15, 2015
  13. Fredrik J

    Fredrik J Member

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    Thank you Noorbeast
  14. Fredrik J

    Fredrik J Member

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    Now i know why you needed the pivot placement and where the motors were beeing mounted :)

    Cheers Noorbeast!!!!
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  15. Fredrik J

    Fredrik J Member

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    Hmm only 65rpms at shaft might be a problem if i understood the calculator right i need longer levers to compensate or a L lever to help speed up motion
    Motor is 4200rpms so i wonder if reduction really is that big??? I think it should have more than 65rpm´s!!

    Attached Files:

  16. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    4200 rpm divided by 60 = 70 rpm at the shaft.

    Keep in mind the longer the CTC the faster the linear speed, but the less torque there is to move the sim, hence my suggestion to maximise leverage as much as possible.

    Also keep in mind that there is significant mechanical loss with worm gear boxes, anything from 10-50%. So allow plenty of design leeway.
  17. Fredrik J

    Fredrik J Member

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    So basically we end up with motors far back to the rear and with pushrods leaning towards shoulderpoint on seat like in the seatshakers 15 to 20 degrees.
    So leverage will be maximized ==??? And then i can shorten the motor levers i guess.
    That wont be a problem even though the frame is only 160cm, as i sit and race now im 130cm to back of seat give or take some so there is room to moove them max to the rear but angle will be kind of steap towards the seat so i might reconsider the length of the frame.
    Thank heavens i didnt start the build :), trial and error can be costly hehe.
  18. Fredrik J

    Fredrik J Member

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    If i did the charts right i have with a 50mm lever 523.6 NM with theese motors.
    And i might reduce the 42mm tubes for 28mm ones to get some more weight of :( but then i will have to ad more material to stiffen it up so i dont know how much that will be in weight loss but lots for sure.
    I did a paint drawing and hehe its not much better than my hand drawn hahaha. But i think i get what you mean.
    I need to do the frame to get the COG before i can calculate i think, have decided screens will be static :(.
    Then i can calculate the levers and degrees and where the motors will be placed, and most of all i will know the total weight of the whole package!

    Cheers for helping out mate!
    Freddie Namnlös.png
    Last edited: Jun 15, 2015
  19. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    Static screens do help and shoulder shaker designs are popular as they are a pretty efficient design, even though the torque is applied at an angle the leverage really makes up for it.
  20. Fredrik J

    Fredrik J Member

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    Sweet then im on the right track
    Cheers mate