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Angles

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by drzmat, May 13, 2020.

  1. drzmat

    drzmat New Member

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    Hi, i am planning my motors position on my 2dof setup and i would need someone to explain me the difference between the "rest angle" and "current angle" in simcalc.

    Thanks a lot!
  2. Ads Master

    Ads Master

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  3. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Just some context - The most effective use of torque is when the angle of force is at 90 degrees to what is being acted on. For example if you push on an open door with your little finger, at 90 degrees, you can easily move the door. The more acute the angle the harder it is to effectively push the door.

    So, if you have a compact rig the levers at rest would be 0 degrees, as that means the rods are 90 degrees to them, directly connected to the base of the seat.

    But if you have a shoulder mount rig, with the motors behind the seat, for the lever to rod angle to be at 90 degrees the levers at rest will likely be at say 40-45 degrees, depending on how far back the motors are from the seat and how high the connecting mount is.

    To summarise the at rest angle for the levers is to position them at 90 degrees to the rods, which in turn are connect to and move the seat, with design affecting what the rest angle will be.
    Last edited: May 13, 2020
  4. drzmat

    drzmat New Member

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    Thanks for this Noorbeast, but what about that "current angle"?

    What is it?

    I understand the "rest angle" now, no problem there.
  5. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    It is the current angle of your CTC lever, measured in degrees away from the zero position.
  6. drzmat

    drzmat New Member

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    Yeah thats the part i dont understand....

    Sounds the same as the rest angle to me...

    Lets say i have a rear shoulder mount setup with motors at the rear, my ctc rest angle should be around 45 degrees from the ground, rods at 90 degrees from lever, now what about that current angle? if my setup is currently leveled it will be 45 as well?

    I just dont understand the role of this value (current angle) in simcalc

    Sorry for my misunderstanding!
  7. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    You can use the current angle to check resultant forces across the intended range of the lever.
  8. drzmat

    drzmat New Member

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    Ha there you go!

    Thanks noorbeast!
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