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25:1 Motor placement full sim motion

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by rkbaseball, Jun 9, 2020.

  1. rkbaseball

    rkbaseball New Member

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    Hey all,

    Did some research and I wanted to confirm some thoughts. I am building a full motion rig (can't go seat mover with current setup) and am trying to figure out motor placement. My Center of Balance is about 60% rearwards in my chassis (Attached photo of U joint location relative to chassis, excuse the mess). I'm trying to figure out the best location to mount my motors. I read that front and rear are drastically different, and that shoulder mount is the ideal location. My chassis will be sitting 7" above the ground on the U joint and 42" rearwards (out of total 64"). My lever arms off the motors are 2" long, which means if I mount them rearwards at 57" I would hit the nose at full travel. Any corrections or thoughts? They're 25:1 motors. The whole chassis will weigh ~250-280 lbs including my weight. The base will be made of 2x4s (I know not preferred but working with a budget for now).

    Any advice for placement would be much appreciated! My current plan is to mount the motors 17" behind the U joint and 17" apart with a 2" arm as this gives me a little bit of clearance in the front.

    Attached Files:

  2. Ads Master

    Ads Master

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  3. rkbaseball

    rkbaseball New Member

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    I used the SimCalc application that I found on this site to find some basic settings. The first setup I am going to try is the under-chassis mount. If this works well I am going to leave it. It appears to have better roll efficiency than pitch. But if that does not work I will move to the rear engine mounts. That will hopefully help with pitch efficiency at the cost of roll.
  4. cgodwin

    cgodwin Active Member Gold Contributor

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    What are your motor specs? RPM, torque or power? With a slow but powerful motor you want to have it close to the U joint so the sim will move faster with a smaller range of motion of the motor. A fast motor with low torque would work best if moved away from the U joint.
  5. Gadget999

    Gadget999 Active Member

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    is this 2dof ?
  6. rkbaseball

    rkbaseball New Member

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    I'm not sure. I believe they're the MCP4 motors with a 25:1 ratio. I bought them because I saw 25:1 ratio and saw some people used them on here. It looks like those gearboxes can be hooked up to different motors though