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2dof seat mover shoulder mount

Discussion in 'DIY Motion Simulator Projects' started by Jrank1, May 28, 2020.

  1. Jrank1

    Jrank1 New Member

    Joined:
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    My Motion Simulator:
    2DOF
    Hi all,

    Thanks for having me.. I have been digging through posts and I am fairly well on my way with the change from static to seat mover..

    this is how far along I am at current...

    upload_2020-5-28_19-20-3.jpeg

    upload_2020-5-28_19-21-5.jpeg

    upload_2020-5-28_19-21-30.jpeg

    upload_2020-5-28_19-21-57.jpeg

    upload_2020-5-28_19-22-14.jpeg

    upload_2020-5-28_19-22-42.jpeg

    upload_2020-5-28_19-23-4.jpeg

    upload_2020-5-28_19-23-21.jpeg

    So obviously I have a few questions and this seems like a good place to start..

    Mechanical side of things, I am happy with how it is coming along, but time to get the motors moving..


    wiring..

    so I am using 2xmotors from an RC golf cart (not sure on specs or how to find out)

    I need;

    arduino board
    Monster moto board(s)
    PSU (1 or need 1/motor?)
    Potentiometers


    I don’t understand the hall pots/potentiometers, I understand they send feedback to the controller? But certainly not sure what I should be looking for when I buy them..

    What I’ve learnt about the Arduino.. it plugs into the comp, then I run to a moto board (or 2) then to the motors. Through different ports, which are chosen and soldered on to the Arduino.
    I have no idea about the programming of the board but happy to learn when I get to that stage. (I have built several RetroPi boxes with the raspberry pi)

    can you guys enlighten me in regards to the electronics please.. see below pics from EBay Australia and let me know if I am on the right track..

    upload_2020-5-28_19-35-43.png

    Does this suit, if so why, if not, why

    upload_2020-5-28_19-36-29.png

    Will this run both motors?

    upload_2020-5-28_19-36-55.png

    Is this the arduino I’m after?

    many help would be greatly appreciated or even links to the right posts..

    thanks again
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Great start, I look forward to following your build :thumbs

    You should test cheap clone MMs when you get them, as quality control can be an issue: https://www.xsimulator.net/community/faq/reputable-monster-moto-suppliers-testing-before-use.158/

    Cytron controllers are a fairly cheap alternative to MMs: https://www.xsimulator.net/community/threads/blame73s-2dof-seat-mover.6029/page-22#post-198335

    Go with an Arduino Uno R3.

    While quite a bit more expensive I would suggest Hall sensors, as they won't break if over rotated, they are very precise and have long term durability, shop around but go for something with these specs: https://au.element14.com/bi-technol...fs/sensor-hall-0-2v-20v-to-10v-pin/dp/2319662

    You need to install code on the Arduino and I would suggest SMC3, as it has a handy configuration app: https://www.xsimulator.net/community/faq/arduino-code-for-use-with-various-hardware-and-simtools.31/

    PSUs are pretty cheap, you can mod server PSUs: https://www.xsimulator.net/communit...ver-power-supplies-as-cheap-powerful-psus.54/

    Or use cheap LED PSUs, which are a little more robust.

    Our rigs can generaet some significant power spikes on fast reversals, so I have gone with a PSU for each motor.
  3. Jrank1

    Jrank1 New Member

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    My Motion Simulator:
    2DOF
    thankyou.. some great info there.. happy to spend more on the sensors and will likely purchase the ones you have mentioned..

    as for the PSU.. it seems my motors are around the 200w mark (researching replacement motors for a Condor electric golf buggy) so what sort of wattage PSU do I need?

    thanks again
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Balance:
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    Ratings:
    +10,741 / 52 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    On my compact rig for space reasons I use HP DPS-600PB B PSUs, which supply 575W(Max). I started with some second hand ones, but they were a bit flaky, then I managed to get a good deal on some brand new ones, which have been flawless for years.

    You could go for cheap 600W LED PSUs, or at the top end a Meanwell PSUs.
  5. Jrank1

    Jrank1 New Member

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    2DOF

    Thanks for the advice @noorbeast . Much appreciated. I will target something around the 600w mark/motor. Would a 600w LED PSU need to be modified? (I see people writing about having to modify something within the PSU's to make them work with the motors)

    Would these below be suitable;

    upload_2020-5-29_10-51-24.png
  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    No a LED PSU won't need to be modified, but a repurposd server PSU, like I use, will.
  7. Jrank1

    Jrank1 New Member

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    My Motion Simulator:
    2DOF
    Ok so I have purchased below.. will bench test the MM’s when they arrive (believe I only need 1 for both motors, so will have a spare)

    2x600w LED PSU’s
    Arduino as recommendation

    upload_2020-5-29_15-24-40.png
  8. Jrank1

    Jrank1 New Member

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    My Motion Simulator:
    2DOF
    I have also purchased below hall effect sensors as suggested;

    upload_2020-6-3_12-5-33.png
  9. Jrank1

    Jrank1 New Member

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    My Motion Simulator:
    2DOF
    After a good day (and almost night) I finally got to a point where Simtools is working and the seat is in motion!!!! :cheers

    I have to say that I spent a lot of time trying to find out what I do next once SMC3 utils was working. I finally stumbled across the videos on you tube for Simtools. Absolute priceless resource and something I think should be pinned.

    I Have to say a big thanks to this forum and key players like @noorbeast. Without this valuable info none of this would be possible.

    Will post a video or 2 shortly.
    • Like Like x 1
  10. Jrank1

    Jrank1 New Member

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    My Motion Simulator:
    2DOF
    Short video of when she come alive!

    • Like Like x 2
  11. yellofella

    yellofella Member

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    Occupation:
    builder
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    UK
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    My Motion Simulator:
    3DOF, SimforceGT
    hi buddy.
    Great news on getting your sim working, its a good feeling when you put in so much effort and time into something and get a good result. Guess your on to the tuning stage now and making any improvements that you can to make it even better. One suggestion i would have would be to move your motors back further from the seat to decrease the angle of the connecting rods. As you have them setup at the moment the motors are trying to lift rather than push. Decreasing the angle to 45 degrees rather than the 90 degrees you have now will give you better performance, try inputting the values into simcalc and you will see the speed difference it will make as well as your drivers/motors not working so hard so generate less heat.
    keep up the good work
    • Agree Agree x 1
  12. Jrank1

    Jrank1 New Member

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    My Motion Simulator:
    2DOF

    Thanks for your input.

    I have found that the motors 'fall' past the max limit when I sit on the rig. Not enough angle may be my issue. Was hoping I didn't have to move them back but was considering moving the pivot point.

    Are there any adjustments I can make in SMC3 utils to provide enough minimal power to 'hold' the arms in position?
  13. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    +10,741 / 52 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    What is the Center To Center (CTC) length of the levers, as they look pretty long for the limited leverage length that you have.

    Shortening the CTC length by drilling another hole and moving the rods back will trade a little speed for torque. If that is not enough, or is marginal, then you may need to consider moving the motors further back to increase the rod angle: https://www.xsimulator.net/community/faq/shoulder-mount-rod-angles.149/

    You should balance the rig with all peripherals and yourself on it: https://www.xsimulator.net/communit...-of-gravity-to-balance-a-motion-simulator.55/