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DIY 2 DOF on a budget

Discussion in 'DIY Motion Simulator Projects' started by Denis Mowberry, Aug 21, 2023.

Page 3 of 4
  1. Denis Mowberry

    Denis Mowberry Member

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    My Motion Simulator:
    3DOF, Arduino, Motion platform
    I am looking at a 24v 350w motor from AliExpress but the output speed is 300rpm .Do you think this is to fast
    Denis Mowberry, Oct 11, 2023
    #41
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Do you have a link to the full specs?
    noorbeast, Oct 11, 2023
    #42
  3. Denis Mowberry

    Denis Mowberry Member

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    My Motion Simulator:
    3DOF, Arduino, Motion platform
    350W brush motor


    Rated speed: 3000rpm/min

    Gear Ratio: 9.78:1

    Actual speed: 300 rpm

    Torque: 1.1N. M

    Weight: 3 kg
    • Like Like x 1
    Denis Mowberry, Oct 11, 2023
    #43
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    I consider the torque at 1.1N. M is likely way too low for most designs.

    For most designs with a reasonable amount of inherent leverage I would suggest a minimum of 20nm of torque, and for compact designs twice that.
    noorbeast, Oct 11, 2023
    #44
  5. Denis Mowberry

    Denis Mowberry Member

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    My Motion Simulator:
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    Thanks for that. I will try a bit more with the motels I have. I need to reduce the amount the motors move as they are moving 180 degrees. I have tried in smc3 reducing clip limit but nothing changes . How do I adjust the amount the motors move
    Denis Mowberry, Oct 12, 2023
    #45
  6. Denis Mowberry

    Denis Mowberry Member

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    My Motion Simulator:
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    I just seam to have far more questions than answers this motor lists rated torque and stalled torque . Which one should I be looking at
    Product Name
    Worm Gear Motor
    Voltage
    24V
    Rated torque of motor
    6 N.m
    Stall Rated torque
    52 N.M
    Denis Mowberry, Oct 12, 2023
    #46
  7. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Continuous rated torque is the motor's continuous torque that it can output at rated speed, close to the max speed of the motor. This is a better judge of the motor's performance as it's the motor's torque at speed.

    Continuous stall torque is the motor's continuous torque at 0 speed (at stall). This is the locked rotor torque. Manufacturers test this by locking the rotor and then monitoring the motor temperature as current is powered into the motor.

    Most manufacturer's if they list a continuous torque and don't tell you if it's at stall or at speed, is typically at stall. The rated torque takes into account the spinning (magnetic) losses and thermal (I2T) losses of the motor. At 0 speed, these losses are 0 and thus the stall torque is higher than the rated torqued.
    noorbeast, Oct 12, 2023
    #47
  8. Denis Mowberry

    Denis Mowberry Member

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    My Motion Simulator:
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    I have made steady improvements with tuning my rig but am unable to reduce the amount of movement the motors have . They move a full 180 deg and as they are a little small and under powered I would like to reduce this so I am only using the area of maximum torque . If I can just get it a bit better I will post my start to finish build . Thanks.
    Denis Mowberry, Oct 18, 2023
    #48
  9. 90kgOver300m

    90kgOver300m Member

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    I found if the limits are set to 255max, that is the minimum movement for your motor / pot setup. I wouldn't worry about it too much, as when you load simtools and begin to program your axis, you czn control their range of motion on there much easier.
    90kgOver300m, Oct 18, 2023
    #49
  10. Denis Mowberry

    Denis Mowberry Member

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    My Motion Simulator:
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    Sorry for the dumb questions but can you tell me what adjustments to make in sim tools. Is it just by reducing the % numbers
    Denis Mowberry, Oct 19, 2023
    #50
  11. 90kgOver300m

    90kgOver300m Member

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    Yeah that's correct, for example I have my traction loss set to about 40%, if it was 100% it crashes into a bracket
    90kgOver300m, Oct 19, 2023
    #51
  12. Denis Mowberry

    Denis Mowberry Member

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    My Motion Simulator:
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    U Screenshot (8).png sing the tuning center in sim tools the game data input is all showing 0 is this correct
    Denis Mowberry, Oct 20, 2023
    #52
  13. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    The game has to be running to provide telemetry, was that the case when this image was taken?
    noorbeast, Oct 20, 2023
    #53
  14. Denis Mowberry

    Denis Mowberry Member

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    My Motion Simulator:
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    No the game was not running do I need it to be running 2 screens to see it when the game is running and what should I expect to see
    Denis Mowberry, Oct 21, 2023
    #54
  15. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    If you check out the Tuning Center while a patched game is running the telemetry will be evident in the top row on the green banner.
    noorbeast, Oct 21, 2023
    #55
  16. Denis Mowberry

    Denis Mowberry Member

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    My Motion Simulator:
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    After doing more research into new motors for my rig I am still unsure as to what will best suite my needs I have found a 24v 250w motor putting out about 10nm at 300rpm . My rig has the motors at the front about 900mm from the pivot point . Would 10nm be enough and is a speed of 300rpm to fast.
    Denis Mowberry, Nov 4, 2023
    #56
  17. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    noorbeast, Nov 5, 2023
    #57
  18. aparecido

    aparecido diy 2dof for flight simulator 2020

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    I'm saving my coins to buy a weekly package....
    aparecido, Nov 21, 2023
    #58
  19. Denis Mowberry

    Denis Mowberry Member

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    I decided I could not get my rig to move how I wanted it to using wiper motors so I have bought 2 24volt 250 watt motors with a shaft speed of 120rpm .What length should I make the arms that join the motor to the connecting rods. I want as much movement as I can get without over loading the motors
    Denis Mowberry, Nov 27, 2023
    #59
  20. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Have a play with SimCalc plugging in the dimensions of your rig, to get an idea of the tradeoffs between design and physics: https://www.xsimulator.net/communit...e-linear-speed-and-forces-of-your-design.270/

    I would guess 50-60mm CTC is likely in the ballpark, but it is easy to drill additional holes in the levers to experiment beyond that, with real world performance being the best guide.
    noorbeast, Nov 27, 2023
    #60
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