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Gear Motors

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Sebj, Jul 8, 2015.

Page 3 of 3
  1. Mazhar Salam

    Mazhar Salam Member

    Joined:
    Mar 27, 2014
    Messages:
    43
    Location:
    Melbourne
    Balance:
    907Coins
    Ratings:
    +24 / 1 / -0
    My Motion Simulator:
    2DOF, Arduino
    hi...
    I have done a lot of reading to choose the right motors for building my sim. A motor is manufactured in a trade off between torque and speed. that is higher the speed, less the torque and vice versa. Anyway, in our case, we need more torque. the motor mentioned here even though widely used by community members is configured exactly opposite to our purpose. That is it is running at about 3500 to 4000 rpm by compromising a lot of torque. when we add gears, again up to 50 percent of the torque is lost in transfer. However, the necessary torque required to move a sim in our case is achieved by pumping in more current in to the motor.

    the ideal motor will have a speed of maximum 1500 rpm with 10:1 gear box. Notice that both the above setup and this setup will have a final output speed of 150 rpm however, this setup can life upto twice the weight or use half the current required. You can simply check how much weight a system can lift by using the torque calculation formula.
    Mazhar Salam, Aug 12, 2015
    #41
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
    Messages:
    20,535
    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    145,034Coins
    Ratings:
    +10,776 / 52 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    I think the 'ideal' motor and gearbox is challenging, as it relates to questions of design parameters, availability and actual cost.
    • Agree Agree x 2
    noorbeast, Aug 13, 2015
    #42
  3. Sebj

    Sebj Active Member

    Joined:
    Nov 13, 2014
    Messages:
    287
    Location:
    Canada
    Balance:
    492Coins
    Ratings:
    +165 / 1 / -0
    My Motion Simulator:
    2DOF
    I wanted to solicit some advice from the expert builders here on the forum :)

    Based on my preliminary design above, I want to determine what material to use for the frame. The obvious is steel but perhaps I need to use lighter weight material since its going to be traction loss frame that needs to be moved smoothly (with a 50:1 gear motor)

    If steel, how wide should/could the steel square bars be and how thick? I want to ensure there is no flex or bending.

    Lastly, what material to use for the castors to roll on for traction loss, should it be a half inch piece of steel or what else can I consider.

    thanks guys!
    Sebj, Sep 19, 2015
    #43
  4. bsft

    bsft

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    @Nick Moxley , what did you build your set up from? Maybe you can advise here
    bsft, Sep 20, 2015
    #44
  5. Sebj

    Sebj Active Member

    Joined:
    Nov 13, 2014
    Messages:
    287
    Location:
    Canada
    Balance:
    492Coins
    Ratings:
    +165 / 1 / -0
    My Motion Simulator:
    2DOF
    That setup is not yet built. I think steel is likely the senseable choice. Wondering what size rods others have used.
    Sebj, Sep 20, 2015
    #45
  6. bsft

    bsft

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    Ive use 25mm box steel on mine with no problem, and had 16mm MDF sheet screwed to the base to hold the tailshaft uni. It supported my 86 kg and 12 kg seat easy. And even survived 130 kg players
    • Like Like x 1
    • Informative Informative x 1
    bsft, Sep 20, 2015
    #46
  7. WhiteGoblin

    WhiteGoblin Member

    Joined:
    Jun 29, 2015
    Messages:
    50
    Location:
    California
    Balance:
    549Coins
    Ratings:
    +38 / 1 / -0
    My Motion Simulator:
    2DOF
    These are the motors I used for a full frame 2dof build. Includes feet, peripherals, etc. They work great with a short arm, I believe mine is 50-60 ctc.
    WhiteGoblin, Sep 25, 2015
    #47
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