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Calculations as per FAQ #89

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by GTexas, Mar 16, 2017.

  1. GTexas

    GTexas New Member

    Joined:
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    Houston, TX
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    My Motion Simulator:
    2DOF, DC motor, Arduino
    I am in the planning process for a motion rig and have started some calculations to verify my design basis.
    I believe there are some corrections/amendments needed for FAQ #89:
    1. The linear speeds as per "http://www.endmemo. com/physics/rpmlinear.php" are the max linear speeds @ 90 degrees. At lower angles the linear speeds are lower. As the rig position at the start of a movement can be different it may be more useful to use the average linear velocity (which can be easily calculated from twice the CTC being traveled in half a rotation) to determine if the planned rig is fast enough.
    2. The sample calculations using a motor as per "https://www.motiondynamics. com.au/worm-drive-motor-12v-24v-200w-180-rpm-20nm-torque.html" should be amended. The torque conversion calculations done in the sample calculations seem to use a gear loss of 36%. It would be helpful to state this. The motor torque assumed for the sample calculations is 12.5 Nm. However the referenced motor "https://www.motiondynamics. com.au/worm-drive-motor-12v-24v-200w-180-rpm-20nm-torque.html" has this torque only after the worm gear and not at 3600 rpm. A 200 W motor with 12.5 Nm @ 3600 rpm would be nice to have though.

    It would be helpful if someone with more experience could check the above. Thanks.
    GTexas, Mar 16, 2017
    #1