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Bodgy 2DOF + traction build.

Discussion in 'DIY Motion Simulator Projects' started by bodgy, Jul 5, 2013.

  1. bodgy

    bodgy Member

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    Hi All,
    Lurked these forums years ago but everything has come a long way and simplified since then so I think I'm going to make an attempt at a simulator. Hoping to build a 2 dof sim with drift/traction loss.



    Plan so far:
    (Things already around the house)
    *40 amp 12v caravan charger.
    *35ah agm battery.
    *One 'big motor' 12v worm drive from a broken electric golf caddy. (second worm drive was damaged so only one working unit).
    *Logitech MOMO wheel and pedals.
    *3d Projector. (waiting for my glasses to be delivered)
    *Racing seat, free from a mate if he can find it.

    To order:
    *Unsure weather to bite the bullet and go with JRK controllers (3 x $100 + shipping blows the budget out a bit) or try an arduino set up. I have limited experience with programming so the JRK units are looking more attractive.
    *Hoping the worm drive motor I already have can operate the yaw axis and go with wiper motors for chair actuation. If not order 2 more worm drives or search the junkyard again.
    *Would like a tactile transducer setup. Probably 4 dayton pucks.

    I have been toying with a design in my head that manifested itself in google sketchup this morning.
    *It basically centres around a brake disc that is mounted on a stub axle welded to a lower frame.
    *An upper frame would mount to the brake disc and would hold the chair actuating motors.
    *A uni joint would be welded to the hub and the seat etc would be mounted from there.

    Sim Frame 1.jpg
    Sim Frame 1 dfg.jpg
    Sim Frame 1 hum.jpg

    Any ideas/criticism? Would love some feedback and links to similar designs. Motor/linkage placement is just for conceptual purposes and would obviously need adjustment. My real concern is the brake disc as a pivot point i suppose.

    Cheers.
  2. value1

    value1 Nerd SimAxe Beta Tester SimTools Developer Gold Contributor

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    My Motion Simulator:
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    That looks a neat design. I like the yaw rotation!
    It should be doable as you don't have to deal with the full weight of the seat/driver but only with a fraction if you balance it right.
    :clap: Go for it. Collect the parts and start building!
    (I personally would recommend the JRKs; if you're into electronics and programming then building the controller yourself is certainly also a big portion of the fun :) )
  3. eaorobbie

    eaorobbie Well-Known Member SimTools Developer Gold Contributor

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    I would advise not to use wipers in a sim as big worms are actually cheaper than a new wiper. Plus using them as planned in extreme movement the weight plus the speed you need to move at will cause the wipers to fail quickly. Been there and before big worms were discovered I used a Boat winch.

    Jrk yes as Value1 has explained for ease of use and reliabilty you wont find better, but if you are skilled at electronics and programming go that way. Jrks might seem expensive but line up a decent microcontroller and decent h bridges you will be close to what the jrks are going to cost, not including the many, many hours you will put in to make a custom driver actually work.

    Another suggestion is to look into the Kangaroo from Dimesion Engineering, I was going to do a quick study on them while I was at X-Sim3 but this seemed to not go down well , Oh well no loss. I like to promote of the shelf items.
  4. yokoyoko

    yokoyoko Member

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    My Motion Simulator:
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    I will not bother, but I believe that was not really the reason, or? But I don't really know what happened these days, as I was not very active this time. Please do not get me wrong - you've always helped me and I respect you very much! Generally, I find that such things/comments are not good in a project thread.

    -> sry for off topic.
    • Dislike Dislike x 1
  5. bsft

    bsft

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    JRKS definitely.
    Big worm gear and or boat winch motors for sure.
  6. bodgy

    bodgy Member

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    My Motion Simulator:
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    I think it's gonna have to be JRK controllers. I am way too keen to get this going to stuff around giving myself extra work.

    Any link's to these winch motors? (are they the boat ones from super cheap auto?)

    Yoko said something about maximising the felt force by moving the pivot point forward but like he said that would require extra support at the rear and I am trying to keep this as simple as I can. I had a rethink and was wondering what people think about this pivot design trying to maximise movement. Too much for a worm drive or winch motor to handle with the extra load closer to the axis?
    Sim Yaw Design.jpg
    Sim Yaw Design 2.jpg
    • Friendly Friendly x 1
  7. bsft

    bsft

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    The supercheap 12v 900kg boat winch motors are not listed on their site last I checked, but should be in the shop.
    From memory, Eaorobbie used them in the beginning and they were spot on for lift power.
    This is the sort of thing if you need to find it elsewhere
    http://www.ebay.com.au/itm/NEW-12V-2000 ... a00&_uhb=1

    As for YAW setup frame, best others whom have done it advise :D

    However, it looks like a rotation base more than a swing base. Would it be better with the frame setup like on a big swing arm that is balanced, say , on a set of rails.
    Like in the first couple of pictures in this post?
    2dof-motion-simulator-with-a-rotation-axis-t1531.html?hilit=drift
    Something more compact could be made.
  8. eaorobbie

    eaorobbie Well-Known Member SimTools Developer Gold Contributor

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    Yes it was the 12v boat winchs I first used , beware they are a little noisy in operation, but crank the game sound up and its not noticeable. To me for traction loss you will want the pivot at your feet and an easy way to support the rear would be caster on the rotating base making contact with the ground, with the proposed front pivot they will not need a guidance rail to run in, just clear area on the floor. But if you intend to use this for flight place the rotation (yaw) pivot under the cg point for the top gimbal this will be correct for yaw in flight and race. Up to you.
  9. bodgy

    bodgy Member

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    My Motion Simulator:
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    Well after a 3 year hiatus I'm back. I killed a JRK with the out of JRK capacity winch motors and put the project on the backburner after blowing one up. I saw the old rig last weekend after cleaning the shed and figured it was time to resurect so here I am.

    I'm gonna do this with proven components that are simple, cheap and reliable. Purchased 2 x motion dynamics 200w motors and a new JRK. I already have another worm drive motor salvaged from a golf caddy and will add that in for traction loss after I finish a 2DOF. Am currently battling with my arc welder and putting frame together while I wait for the electronic parts.

    Received the motion dynamics worm drives today and am back into it. Should get the replacement JRK tomorrow and hope to see motion by the weekend.

    Progress pic:

    Attached Files:

    • Like Like x 1
  10. bodgy

    bodgy Member

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    Couple More (sorry for the poor quality, on a $9 phone after my 1 year old literally sucked the life out of my primary phone):

    Attached Files:

  11. bodgy

    bodgy Member

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    My Motion Simulator:
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    Motor output shaft is 12mm stainless rod with tig welded arms that were a random stainless part I found. I'm using 180 degree hall sensors that are connected on the opposite side of the actuator, these are connected via aluminum arms that are secured with a 3mm thread screw. The aluminium arms will be bolted to the hall sensors. I currently have screws holding this hardware together for testing but will update to 8mm bolts before placing under load.[ATTACH IMG_20170301_211823[1].jpg IMG_20170301_211834[1].jpg IMG_20170301_211846[1].jpg IMG_20170301_211858[1].jpg ]38201[/ATTACH] IMG_20170301_211823[1].jpg IMG_20170301_211834[1].jpg
  12. bodgy

    bodgy Member

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    My Motion Simulator:
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    She is a bit of a mess right now but it is functional! Have been playing LFS with the demo version and trying to get my head around the axis setups.

    Just had a really good time on a rallycross track using an Xbox controller with heave included and I'm grinning from ear to ear.

    Hall sensor slipped and motor did a full rotation where the actuator rod binded on the motor shaft but I don't think I damaged anything. Will redesign arms so they can free spin as well as the hall sensor linkage so it cannot slip. Was just too IMG_20170303_211100.jpg IMG_20170303_211032.jpg keen to get on it even though it is just a test rig at the moment and needs lots of refinement.
    • Like Like x 2
  13. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Congrats, I will be looking forward to seeing a video of your rig in action once you iron the bugs out :thumbs
    • Like Like x 1
  14. bodgy

    bodgy Member

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    Sorry about the vertical video. I took this to show the boys at work and would be showing it on my phone. I promise to use the correct orientation next time but I can't help but share it.

    • Like Like x 2
  15. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Great to see your rig in action.

    Consider adding a cheap race harness, you will be surprised how much of a difference it makes to the sense of motion when the user can't lean forward away from the seat.
    • Like Like x 2
    Last edited: Mar 5, 2017
  16. bodgy

    bodgy Member

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    My Motion Simulator:
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    Yeah I'm gonna get a 4 point cheapy on eBay.
    Also keeping an eye on Gumtree for an old racing seat and g27. Currently have a Logitech momo that was a freebee but its not great with only 240° rotation. Can't justify a thrust master or fanatec.

    Thanks by the way. You have helped more than you know with the countless tutorials you have written and noob questions you have answered. Its hard to make coins because you have already answered every question I have had haha. Cheers.
    • Like Like x 2
  17. bodgy

    bodgy Member

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    My Motion Simulator:
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    Scored! G27 on Gumtree for $100. By no means top end or cutting edge but compared to the Logitech momo its night and day.

    Should I go a 3 point or 4 point harness? Is a sprung mounting point to the base worthwhile or should I just secure it above the pivot?
    • Like Like x 1
  18. bodgy

    bodgy Member

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    My Motion Simulator:
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    Also, life pro tip: Wear long sleeves and pants when welding. God my legs are fried. Thought "She'll be right. It's just a couple of welds", now you can see how high I wore my socks today.

    Better life pro tip: Have a mate do it with a mig. Welds sucked and I scraped everything I did. I swear I'm better at it after a few beers. It's like playing pool - you're sober you suck, 3 beers your in the zone, 5 beers you suck again.
    • Funny Funny x 1
    Last edited: Mar 6, 2017
  19. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    3 point or 4 point harness is really personal preference, the main thing is that it makes you move with the seat and that makes a huge difference to the sensation.

    Many do spring load to the base.
  20. bodgy

    bodgy Member

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    My Motion Simulator:
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    Still on the shitty phone. Progress pics.

    Kids have been sick, I have been sick, blown JRK from stupidity, just want to drive it and not finish it.

    PC specs: 4790k overclocked, RX480 AMD, 16GB.

    Projector: Old Sony 720P but... free! VR for bday?

    Sim: Motion Dynamics 50:1, 2x JRK, 180 degree halls, mobility scooter parts and frame, old dog bed frame, scrap steel from tip, uni free from motor wreckers, Logitech speakers 5.1 but only running 3.1 (need to find some rears... they were free), G27, 2x10ah AGM batts, 50A PSU.

    IMG_20170323_170151[1].jpg IMG_20170323_170242[1].jpg IMG_20170323_170302[1].jpg

    Attached Files:

    • Like Like x 2