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new 2DoF SCN5 build

Discussion in 'DIY Motion Simulator Projects' started by dirigible, Oct 8, 2021.

  1. dirigible

    dirigible New Member

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    Hi, all.
    I'm new to motion simulators, but have built full-size arcade cabinets in the past and am excited to add this new dimension to gaming. I'm going to try to document the build here. I've never publicly document a project before... we'll see how this goes.

    It's going to be a 2DOF seat shaker. My original concept was a full-frame design, but I'm 6' and 200 lbs and want to see to see how the two SCN5s handle my weight. Once I've confirmed the seat shaker has no issues, I may modify it to full frame... but that's a project for another day.
    The build will be welded steel. I've got my 1"x 1" tubing, and am hoping to finish my design and start fabrication over the next few days while I wait for the actuators to arrive.

    Here's a design question:
    In reviewing other projects, I've noticed that many designs that shake at shoulder height incorporate very long rods, extending from the frame base to the actuator, then from the actuator to the shoulder mounts. Is there a reason for the long rods? Why wouldn't the frame extend up the back of unit with just short rods to connect the cylinders, assuming geometry is maintained?
    For reference, here are two possible designs--one with long tie rods, one with short ones:

    Long rod:
    sketch1.jpg

    Short rods:
    sketch2.jpg

    I appreciate the help and look forward to working with you on this!

    Attached Files:

    • Like Like x 1
  2. Ads Master

    Ads Master

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  3. paco

    paco New Member

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    I am starting like you, and I have discarded the long pulls for the fact of bringing more lever to the engines, I am heavy and this worries me especially in small engines, I will be attentive to your thread, greeting
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    • Agree Agree x 1
  5. hideki

    hideki Member

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    If you have the same angles you will not notice the difference much. On the other hand, your rig will be shorter in case you have not a lot of space in the room...
  6. dirigible

    dirigible New Member

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    So, I was able to get a little cutting and welding done this past week. Over the next few days, I hope to test mount both the seat and the U-joint to the seat frame, then move on to building the sim base frame.

    I received confirmation that my SCN5 150s have also shipped, so those should be here soon as well.
    I'm beginning to look at the method of mounting the SCNs to the rods between the shoulder and base frame. I anticipated building something like the SimXperience mounting/damping kits (see image below), but can't seem to find any information on how these work as far as damping goes. Can someone explain this to me? Is the rod that sticks out of the bottom of their SCN5 frame an air shock, or is there a rubber bumper inside it that compresses slightly when impacted?

    Actuators mounted back.jpg
  7. hideki

    hideki Member

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    Those simxperience mountings you see in the photo have rubber bumpers inside. Also simxperience rigs have another 2 of them on the bar attached to the rig (you dont need those IMHO). Take a look at the dumpers FREX uses in their kits, they are easy to build.
    • Informative Informative x 1
  8. dirigible

    dirigible New Member

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    Do you mean these bumpers?
    scnbuttendkit-800.jpg
    I saw those earlier, but I'm not clear how they dampen anything. It looks like a bolt runs right through the bumper from the cylinder to the tie rod end. All the force would be transferred right through the bolt?

    If this is really necessary, I'm thinking I could take one of these bumpers:
    bumper.jpg
    and then fab up a couple of these bolt w/flange things:
    20211015_065927.jpg
    to screw a little way in to each side of bumper to make a sandwich without having the bolt ends touch. The tie rods could then be attached to the flat sides of the flanges.

    Have you ever run the SCN5s without damping? This all seems like a lot of extra work. Might be worth trying without damping first to see if it's actually necessary.
    Last edited: Oct 15, 2021 at 13:48
  9. hideki

    hideki Member

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    MMmmmmmm I see FREX dont sell them anymore, Their website is terrible as usual and I cant find them. The ones you showed me are for SCN6 actuators.
    Here is a video with the ones I told you about. They are easy to place in Aluminium profile. I will try to find a better video coz this one is not:
    Try not to use SCN5 actuators without bumpers. When used properly, those little motors can last for years and years.
    • Informative Informative x 1
  10. hideki

    hideki Member

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  11. dirigible

    dirigible New Member

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    Thanks for the videos! I've never seen a motion sim in person, so I'm relying on photos, videos and the sage wisdom of this community to guide me through this.
    It turns out my local hardware store has a rack of "anti-vibration" bumpers of all shapes and sizes (including what I believe are the exact ones in the Frex SCN6 kit I posted earlier). I'll just slide one onto one of the connecting bolts in the arm assembly . Should be easy-peasy. I'll post photos once I get it put together.
    Last edited: Oct 15, 2021 at 18:39
  12. hideki

    hideki Member

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    You are welcome. there are lots of differents rigs and actuators mountings. You will find easyly the one that suits you best. Good luck!