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Actuator Design

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by BM114, Jun 21, 2019.

  1. BM114

    BM114 New Member

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    Hey all,
    I've been working on an actuator design using the 1605 ballscrew, ballnut and a Nema 34 style motor for a 6dof style platform simulator. Ideally I would be able to use the Clearpath series servo from clearpath, but it is pretty pricey so I may end up using a closed loop stepper with a 1610 ballscrew to compensate for the slower rpm. My design uses 19x90 extrusion provided by minitec (https://www.minitecautomation.com/products/configurable_products/47-profile-19x90-20-0995-0) that I believe will be strong enough to withstand the forces involved while also keeping my profile slim as possible. These lengths of extrusion also serve as a roller guide for the ballnut that is guided by two bearings(one on each side riding the extrusion slot). I hope to upload a BOM of what I've got so far, but I need to tweak it just a little bit first. I think it will come out close to $1200 per actuator if I use the Clearpath motors, but I consider it to be very solid and hopefully quiet. I have a .stp of the assembly, but it seems too large to attach. Perhaps there is another way to reference large files?

    It's something I would really like to try out sometime when money allows, but there's got to be a way to reduce cost. Any tips on where cost can be cut would be appreciated.
    Let me know your thoughts, thanks.

    perspective 1.PNG perspective 2.PNG
  2. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
    3DOF, DC motor, JRK
    Have you tried uploading it as a zip file?
  3. joe extraknow

    joe extraknow Member Gold Contributor

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    For $1200 each, you probably can buy industrial ones, what diy?
    Try at PT-actuator, I believe the model is pt25:
  4. BM114

    BM114 New Member

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    @noorbeast I'm surprised it reduced it by that much to be honest. Thanks for your input.

    @joe extraknow
    Thanks for the reference. I don't seem to see any pricing on their website and I can't watch the video you linked to see if it is mentioned. I will be sure to later when I have sufficient data.

    I started designing because I couldn't find anything nearly fast enough (300mm/s or better) for any reasonable price and being an M.E. I thought it would be a nice challenge. In fact, I'd say the prospect of building the flight simulator is more exciting than using it for me. So I went into CAD and did a few iterations of this until I was reasonably happy with the result.

    Attached Files:

    • zip.zip
      File size:
      2.9 MB
      Views:
      11
    • Like Like x 1
  5. BM114

    BM114 New Member

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    Hey Joe, I got some pricing information from the supplier. I wanted to attach it for a reference if anyone else needs info on it. The actuators are quite a bit cheaper than my design and I'm definitely considering them. Shipping is not included, but $975.83 each is hard to beat for a linear actuator.
    "
    1. Actuator mechanics specs:
    a. Speed :300mm/s

    b. Stroke:300mm

    c. Ball screw Taiwan brand: PT1610.

    d. rod end in front ,and universal joint on the rear

    2. Servomotor

    a. Model aasd 750watts

    b. Motor flange size 80mm

    c. Motor watts :750

    d. Motor speed :3000rpm

    The whole unit(actuators+joints+servos) for this 6dof is only 5855USD.
    "
    • Like Like x 2
  6. 姚妙震

    姚妙震 New Member

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    My Motion Simulator:
    Motion platform, 6DOF
    Why do you try to use hydro cylinder ? I think it will make your work easily and lower fare than electric cylinder.
  7. BM114

    BM114 New Member

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    Do you mean make it hydraulic? Or perhaps a water driven piston setup?

    I personally shy away from using anything with a fluid media as its driving component. There is always a risk of leaks or ruptures and I'm not as familiar with the control of fluid media.

    Hope that answers your question.