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first 2dof project motor question

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by drzmat, May 3, 2020.

  1. drzmat

    drzmat Member

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    Hi guys, i just built my first basic cockpit in prevision of adding 2dof to it.

    I already bought some parts but i am still wondering about the motors.

    I just weighted my rig and its pretty heavy (100lbs) without driver. I weight 150lbs.

    My plan was to use some wiper motors but do you think they should be powerfull enough to give a good experience or i should look at something else?

    Thanks in advance!

    [​IMG]
    drzmat, May 3, 2020
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    noorbeast, May 3, 2020
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  3. drzmat

    drzmat Member

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    Thanks, i am already using it, but theres not anything realted to weight in simcalc from my understanding?

    I tried to upload pictures of my rig (imgur link) in my previous message without sucess...
    drzmat, May 3, 2020
    #3
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    noorbeast, May 3, 2020
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  5. drzmat

    drzmat Member

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    Here you go, thanks Noorbeast!

    My understanding playing with simcalc is that short rods with floor mount instead of shoulder mount would be better with those weaker wiper motors and such an heavy rig am i correct?

    Thanks!

    20200502_165558.jpg
    drzmat, May 3, 2020
    #5
  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    You want as much design leverage as possible with wiper motors, as they are not that powerful, so either a shoulder or foot mount design would likely be the way to go, as they give the maximum distance from the pivot point to the motor placement.

    Keep in mind that wiper motors also need ground isolation.
    noorbeast, May 3, 2020
    #6
  7. drzmat

    drzmat Member

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    With my pivot point found and some calculations in simcalc, looks like the motors will be foot mount.

    Does anything looks wrong in my simcalc printscreen? (motor specs were guessed)

    upload_2020-5-3_10-43-51.png

    Attached Files:

    drzmat, May 3, 2020
    #7
  8. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    I suspect you will need to keep the lever CTC on the wiper motors pretty small, to maximise torque, as with a foot mount design that means it will not be a seat shaker and instead needs to move the full mass of the user, peripherals and top platform. You would need to experiment but I am guessing between 1-2" for the lever CTC.

    If you go with a foot mount, as opposed to a shoulder mount seat shaker design, then keep the top platform as light as it can be, while still retaining rigidity.
    Last edited: May 4, 2020
    noorbeast, May 4, 2020
    #8
  9. drzmat

    drzmat Member

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    The problem is my car seat weighing a lot, so the pivot point is more toward the rear, a good shoulder mount setup would require me to move the motors far behing the seat, and that would take a lot of space in my basement. Thats why i may go with the foot mount option.....
    drzmat, May 4, 2020
    #9
  10. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Nothing wrong with the foot mount option, just consider the lever CTC length and keep the weight down as much as possible.
    noorbeast, May 4, 2020
    #10
  11. drzmat

    drzmat Member

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    Looking at my simcalc posted, are those pitch travel and roll travel numbers enough? Is there a rough standard of travel wanted?
    drzmat, May 4, 2020
    #11