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8020 2DOF Stage 1 add on

Discussion in 'DIY Motion Simulator Projects' started by principiamacb, Feb 25, 2017.

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  1. principiamacb

    principiamacb Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Im planning on modifying my existing 8020 rig with a 2DOF seat mover.

    Im going to move the rig forward and add it onto the back.

    These are the motors Ive just ordered. I think these will work?


    http://vod.ebay.co.uk/vod/FetchOrde...VPS&itemid=112310926327&transid=1629696526001









    20170218_162049.jpg 20170218_162049.jpg 20170218_162132.jpg

    Attached Files:

    • Like Like x 2
    principiamacb, Feb 25, 2017
    #1
  2. principiamacb

    principiamacb Member

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    • Old Old x 1
    principiamacb, Feb 25, 2017
    #2
  3. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    noorbeast, Feb 25, 2017
    #3
  4. principiamacb

    principiamacb Member

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    My Motion Simulator:
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    Your compact build is really impressive. Do you lose any performance compered to a more standard setup with shoulder height mounting points?

    I weight 100kg so it needs to be pretty sturdy.
    principiamacb, Feb 25, 2017
    #4
  5. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    With a shorter design leverage length you do need the type of motors you are getting for a compact design, as more torque is required to drive it.

    But the upside is that you only have to move the base a small amount and the seat back height acts to influence the linear speed of the seat itself.

    All designs have their pros and cons, I was just mentioning the option because you seem to have limited space. With a compact style sim you still need to maximise the leverage design length as much as you can, but it can work well. Mine has had people around 130-140kg use it:

    noorbeast, Feb 25, 2017
    #5
  6. Wanegain

    Wanegain Active Member

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    My Motion Simulator:
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    15Nm is the limit I think.
    On my seat mover I am using 16Nm motors and players of my rugby team are all shaked like a plum tree even one that weighs 120kg ^^
    Wanegain, Feb 28, 2017
    #6
  7. principiamacb

    principiamacb Member

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    My motors have turned up. Now I've got a dilemma before I start. I already had it planned in my head even finding materials at work I can use for a shoulder mount.

    I can see the advantages of a compact design but I'm I going to loose any performance? Compact looks like there is a lot less leverage to play with.

    I want it to be really quick for vr.
    principiamacb, Mar 2, 2017
    #7
  8. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    I will repeat what I already said, all designs have their pros and cons.

    Physics is physics, it takes a certain amount of force to move a mass over a given distance and at a desired speed, so go with a design you are happy with and that matches what you have planned and your own criteria.
    noorbeast, Mar 2, 2017
    #8
  9. principiamacb

    principiamacb Member

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    My Motion Simulator:
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    Here are the motors.

    20170311_100628.jpg

    Im not in any rush with this project and I want it to be to a pretty high standard. Im going to build a 80/20 base then CNC the parts that need to be made.

    Here are the brackets im going to join the motors to the base with.
    MOTOR BRACKET1.PNG
    MOTOR BRACKET2.PNG

    They're pretty over engineered but I wont be paying for the material and I dont want any flex at all.
    • Like Like x 2
    principiamacb, Mar 11, 2017
    #9
  10. principiamacb

    principiamacb Member

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    My Motion Simulator:
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    After a bit of a delay I've finally started machining parts and hopefully over the next month it should be all systems go.

    I think Ive got pretty much all of it figured out but just have 1 question.

    I see that on most shoulder mounted seat movers the motors are facing straight forward. Would it not be better if the motors where facing in at the front, say at 10 degrees so they are pushing the rods in more of a straight line? Would this not put less strain on the motors?
    principiamacb, Aug 23, 2017
    #10
  11. insanegr

    insanegr !N$@n€

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    My Motion Simulator:
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    this is a handy app that will give you some answers to your questions. https://www.xsimulator.net/communit...e-linear-speed-and-forces-of-your-design.270/
    • Informative Informative x 1
    insanegr, Aug 23, 2017
    #11
  12. principiamacb

    principiamacb Member

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    Ive been playing around with that app. Very useful. It would suggest putting the motors at an angle would be a good idea. I was just wondering if there was a reason nobody did it.
    principiamacb, Aug 23, 2017
    #12
  13. insanegr

    insanegr !N$@n€

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    i was wondering the same thing too. it has to be how motors mounts can be attached on the rig easier if they face straight and not with an angle.
    insanegr, Aug 23, 2017
    #13
  14. principiamacb

    principiamacb Member

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    Yeah , I thought it might be that or if it alters the geometry of movement. Ive been trying to go over it in my head but cant really imagine how it would in a negative way.

    If I dont get a good reason not to do it Ill do it like that to start off with.
    principiamacb, Aug 23, 2017
    #14
  15. principiamacb

    principiamacb Member

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    My Motion Simulator:
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    After some delay Im now in the process of building. I was planning on using mm's mainly for cost issues but after buying 5 from 2 different sources non of them worked. 4 had dead channels and 1 worked but heated up the heatsink while just running smc3 with no load on the motor so hot I thought it was going to start smoking.



    20171019_193430.jpg


    So, what to do? Buy more mm's and throw good money after bad? If id had any that worked then I probably would have done but as all 5 didnt work I decided to go for JRKs. 20171019_201928.jpg
    • Like Like x 1
    • Agree Agree x 1
    Last edited: Oct 19, 2017
    principiamacb, Oct 19, 2017
    #15
  16. principiamacb

    principiamacb Member

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    My Motion Simulator:
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    Power supply, fuses and relays all wired up ready for the JRKs to be installed.

    20171019_201823.jpg


    The aluminium extrusion for the rear frame should arrive tomorrow. Ive been machining parts so am looking forward to showing you what ive been making.
    principiamacb, Oct 19, 2017
    #16
  17. Gadget999

    Gadget999 Well-Known Member

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    Gadget999, Oct 19, 2017
    #17
  18. principiamacb

    principiamacb Member

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    They look interesting. I didn't know there was any other dirt cheap options other than the mms.

    Do they work with smc3? I've already bought the JRKs now but could be something to look at in the future.
    principiamacb, Oct 19, 2017
    #18
  19. Gadget999

    Gadget999 Well-Known Member

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    yes - i use the SMC program

    i am also using one for a FFB wheel design
    Gadget999, Oct 19, 2017
    #19
  20. principiamacb

    principiamacb Member

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    I read the whole of that thread awhile ago. It made me think whether I could modify my Frex Simwheel. It works perfectly and the ffb is brilliant but due to old drivers it doesn't work on Rfactor 2 in 64 bit so I can't use Oculus.
    principiamacb, Oct 19, 2017
    #20
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