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[In Progress] Low-cost 2DOF W/ Wheelchair Motors

Discussion in 'DIY Motion Simulator Projects' started by SimRacer12, Dec 6, 2020.

  1. SimRacer12

    SimRacer12 New Member

    Joined:
    Nov 26, 2020
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    My Motion Simulator:
    2DOF, 3DOF, DC motor
    I have started designing, and ordering parts for my low-cost 2DOF motion rig that will become my base platform for future upgrades/updates.

    This thread will outline the build process as well as the parts used for the project. I will be leveraging Fusion360 for the designs, and a 3D printer for most of the parts/pieces.

    Parts List:

    Ordered:

    • 2x Jazzy Wheel Chair Motors (12-24VDC) - $55
    • 1x 24VDC 25A (600watt) Switching Power Supply - $37
    • 2x BTS7960 High Power Motor Drivers - $16
    • 1x Racing Sim Stand (good starting point for a very small price) - $42
    • 1x STM32 Bluepill Microcontroller (Faster Uno Alternative w/ > Analog Accuracy) - Free from Drawer
    Researching:
    • Steel for Framing
    • Extruded Aluminum for Framing
    • Universal Joint
    • Motor Lever Arms
    • Tie Rod Connector Arms
    • Racing Seat
    • 10k Potentiometers

    Here is the wheel and pedal set up in real life:

    [​IMG]

    Modeled the stand in Fusion360 and threw in some extruded aluminum that will attach to it to mount the seat. Also found a model that is close enough to the Thrustmaster I have and threw that in as well.

    [​IMG]

    More updates to come...
    • Like Like x 2
  2. Ads Master

    Ads Master

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  3. Chris Chopping

    Chris Chopping Member

    Joined:
    Jul 24, 2020
    Messages:
    35
    Occupation:
    Mechanical Engineer
    Location:
    Melbourne, Australia
    Balance:
    - 16Coins
    Ratings:
    +10 / 0 / -0
    My Motion Simulator:
    2DOF
    Hi Simracer 12,
    Looks like a good starting point! I would start researching about COG and keeping that above your uni joint. This will give your motors more power to move you rather than keeping you upright.

    What is the rated torque of your motors?

    In terms of steel and uni joints, pots etc, im not sure what country you're building this is in, in terms of helping you find cheap places to buy it all?
  4. Chris Chopping

    Chris Chopping Member

    Joined:
    Jul 24, 2020
    Messages:
    35
    Occupation:
    Mechanical Engineer
    Location:
    Melbourne, Australia
    Balance:
    - 16Coins
    Ratings:
    +10 / 0 / -0
    My Motion Simulator:
    2DOF
    There are plenty of projects on here that will give you more ideas and tell you any problems they had along the way (including mine :p )
  5. SimRacer12

    SimRacer12 New Member

    Joined:
    Nov 26, 2020
    Messages:
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    Balance:
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    +4 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor
    Hey Chris,

    I don't have an exact spec on the motors right now besides this from the eBay ad:
    "Rpms are ROUGHLY 120rpm at 24vdc / 60rpm at 12vdc."

    Once they come in I can do some more investigating and testing.

    As for the COG, you are right and that will play a large role here. I am actually going to try and design my own 3D printed uni-joint with some cheap ball bearings and see how well that works out.
    [​IMG]

    I am buying from Eastern USA and have been looking at Ebay, Aliexpress, and Amazon mostly. I am open to more ideas.

    I just bought 5x 10kohm pots for $2.73 from Aliexpress.
    • Like Like x 1
  6. Chris Chopping

    Chris Chopping Member

    Joined:
    Jul 24, 2020
    Messages:
    35
    Occupation:
    Mechanical Engineer
    Location:
    Melbourne, Australia
    Balance:
    - 16Coins
    Ratings:
    +10 / 0 / -0
    My Motion Simulator:
    2DOF
    The 3D printed uni joint sounds really cool and cant wait to see how that works out!!!!

    However i am slightly concerned that it wont be able to handle the mass or it will deform enough to bind. (I could be wrong)
    Might be worth looking at some automotive stores that have cheap as uni joints. I found one for my sim for less than $15.
    I am from Australia so i cant help much on where to get materials from. Ebay and Aliexpress is where i got most of my stuff. In Australia we have steel supplies that will cut your steel to the lengths you want, along with bolt stores. Both are a lot cheaper than most places.

    Do you have any initial designs as of yet? Would recommend that so everyone can see anything that may work or may not / masses / torque you may need :) Just to save you some time later on
    • Agree Agree x 1
  7. SimRacer12

    SimRacer12 New Member

    Joined:
    Nov 26, 2020
    Messages:
    5
    Balance:
    54Coins
    Ratings:
    +4 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor
    Purchased:
    • 10x 608RS bearings for the 3D printed U-Joint for $7.37
    • 1x 24VDC 25A (500Watt) Power Supply for $36.90

    As for the framing, I am looking at a website called metal supermarkets that seems to be able to deliver cut pieces of material for a reasonable price. Has anyone had any experience with them?

    I am thinking the base of the sim will be made out of welded steel square tubing that is 1.25" x 1.25" x 0.065". This will hold the motors and electrical components. I am deciding between aluminum extrusion and aluminum square tubing for the top portion of the sim that will hold the seat and driver.

    I am working on simulations for the 3D printed U-Joint as well as printing a prototype version so I will keep everyone updated on that part of the project.

    The motor drivers just came in the mail, but the wheelchair motors seem to have gotten lost in shipping. They were least seen about 30 miles from my home, but know the delivery company has no ideas where they are... I am sure they will show up soon.

    As for the simulations, the weakest point seems to be around the bearings which I guess makes some sense, but to me is seems as if this will not cause an issue in practice, any thoughts here?

    [​IMG]

    This is as far as I have gotten as I have been traveling for work:
    [​IMG]
  8. SimRacer12

    SimRacer12 New Member

    Joined:
    Nov 26, 2020
    Messages:
    5
    Balance:
    54Coins
    Ratings:
    +4 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor
    A few more items have arrived:
    • Power Supply
    • Racing Seat
    • VR Headset
    I am still waiting on the motors, unfortunately they are still hung up in shipping.

    I received the chair and created a quick and dirty wooden base for it so that I could try it out and get a rough positioning for it to put into the model. Once the model is updated (waiting on a few more parts to confirm locations) then the framing material can get ordered and the build should take off from there!

    [​IMG]
    [​IMG]
    [​IMG]

    The seat is a cheap $150 one from ebay! I am happy with it so far, looks good, feels good, and was cheap.
    • Like Like x 1
  9. SimRacer12

    SimRacer12 New Member

    Joined:
    Nov 26, 2020
    Messages:
    5
    Balance:
    54Coins
    Ratings:
    +4 / 0 / -0
    My Motion Simulator:
    2DOF, 3DOF, DC motor
    Small update:

    The motors and power supply finally showed up. I was able to throw a quick model together with the motors and some tie rod ends;
    [​IMG]

    Need to do some more testing with the motors as there is a lack of info on the motors, all they have written on them is: 24VDC MAX 3A 180Watt 28:1 H Class TYPE: MOT1706086-L

    More to come...
  10. Christian Doehl

    Christian Doehl Member Gold Contributor

    Joined:
    Oct 6, 2020
    Messages:
    44
    Location:
    Germany - Bavaria
    Balance:
    309Coins
    Ratings:
    +20 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, Arduino
    Really excited to see your 3D printed joint and if it will fullfill the robustness requirements. If not... I bought a one like this and it works absolutly well U-Joint

    BR
    Chris