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Help choosing the right kind of 2dof for me.

Discussion in 'DIY Motion Simulator Projects' started by mariano68, Apr 26, 2015.

Page 6 of 6
  1. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    • Useful Useful x 1
    Last edited: Oct 18, 2015
    noorbeast, Oct 18, 2015
    #101
  2. mariano68

    mariano68 Active Member

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    My Motion Simulator:
    2DOF, Arduino, 4DOF
    I have a question about potentiometers.
    I'm using some cheap pots, they are 10k 1 turn and they are mounted with a 6:1 gear that covers the 80° I need, but I bought also a pair of bourns 10k 10 turn pots, so, If I invert the gears I can use them too, so, wich would be better, to use the Bourns 10 turn pots that has plastic shaft, or to change the bourns 10 turn for bourns 1 turn with metal shaft?
    mariano68, Oct 21, 2015
    #102
  3. bsft

    bsft

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    How about a single 360 deg single turn pot that connects direct to motor shaft.
    • Like Like x 2
    bsft, Oct 21, 2015
    #103
  4. Archie

    Archie Eternal tinkerer

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    My Motion Simulator:
    2DOF, DC motor, JRK
    If you want to use the Pots you currently have, I would use the Ten Turns pots even though they have a plastic shaft.
    My reasoning is that the pressure on the shaft is minimal if you use a flexible coupler to direct mount to the motor shaft, (or the gearing in your case) and being 10 turn pots, if your motor ever flips out you will have time to hit the kill switch before the motor rips your pot apart.
    • Like Like x 1
    • Agree Agree x 1
    Archie, Oct 21, 2015
    #104
  5. mariano68

    mariano68 Active Member

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    My Motion Simulator:
    2DOF, Arduino, 4DOF
    Yes, simple and effective, but because of the way motors are mounted, I can't put the pots at the shaft, instead of that, I had to drill one of the gears of the reduction in the motor to put s new shaft that turns 1,5 turns every 90 degress of the shaft, thats why I'd put the gearings in between the new shaft and the pot.

    Sound super reasonable.

    My question is if I get another benefit for use ten turns instead of one turn, in the resolution reading.
    • Like Like x 1
    mariano68, Oct 21, 2015
    #105
  6. Archie

    Archie Eternal tinkerer

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    My Motion Simulator:
    2DOF, DC motor, JRK
    I can only speak to JRK's as this is all I use, but I only get 180degree of movement from the feedback to the JRK even if my pot will turn forever. The pots I use are multiturn with a degree output of 320degrees, but it makes no difference, still limited to 180degrees.
    • Informative Informative x 1
    Archie, Oct 22, 2015
    #106
  7. bsft

    bsft

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    I have used 5 turn pots with gears and used about 3.5 turns of that pot. To be honest, I could not notice a difference between resolutions of 180 deg or less of a single turn and 3.5 turns of a 5 turn pot.
    I found refining PID , motor settings and profiles gave me more success in resolution than going from 5 to 10 turn pot on JRK.
    • Like Like x 1
    • Informative Informative x 1
    bsft, Oct 22, 2015
    #107
  8. mariano68

    mariano68 Active Member

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    My Motion Simulator:
    2DOF, Arduino, 4DOF
    Thanks very much guys for your feedback!
    So I will focus on motor on SMC3utils and profiles in Simtools.
    • Agree Agree x 1
    mariano68, Oct 22, 2015
    #108
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