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Question Tips when building a 3dof sim

Discussion in 'DIY Motion Simulator Projects' started by incolor, Jan 14, 2022.

  1. incolor

    incolor New Member

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    Hi guys,

    I found this forum a few years back and I have been thinking about building a simulator. There are alot of cool builds here.

    The plan is to build a vr motion sim not a racing rig or flight sim so maybe a bit different than the regular setup.

    I am thinking about developing some sort of on rails VR experience.

    I really like the rig this guy have built

    https://www.xsimulator.net/communit...evelopment-with-brushless-motor-arduino.7978/

    But looking at the servo and drivers my conclusion is that it is a bit too expensive.

    So i guess my question is that can you do something similar but with a bit less expensive parts? I really like the sturdy build and long motion of the platform. Just the rise when starting the sim. So cool.


    I was hoping you can give me some good tips and put me in the right direction. Do you have some good servo / engine alternatives i can check out.
  2. Ads Master

    Ads Master

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  3. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
  4. incolor

    incolor New Member

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    Thanks for the reply noorbeast. Seems like a good option.

    And i feel i need to apoligise in advance but i have very low knowledge of engines and gearboxes so i hope you done mind a few more cluless questions.

    I need the
    And I feel I need to apologize in advance but I have very little knowledge of engines and gearboxes so I hope you don't mind a few more clueless questions :)

    I had a look at this servo

    https://www.aliexpress.com/item/329...-1;SEK+865.74@salePrice;SEK;search-mainSearch

    And i assume a controller like this will make life allot easier

    https://www.thanos-motion.com/products/thanos-amc-controller-rgb-v1-4/#specifications

    But I guess I need a gearbox that fits the servo. I assume the purpose of the gearbox is to exchange speed for torque and in this case also shift it to a dual shaft in 90 degree angle.

    What should I look for to find a compatible gearbox and what would the name of the gearbox type be? Probably have some fancy name :)
  5. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    My understanding is that you want to ensure the aasd15a servo are supplied with shielded cables.

    Yes the @Thanos or similar servo controllers do make these servos nearly plug and play.

    Your design may influence the actual ratio chosen, but what you will be looking for is a Helical Gear Planetary Reducer Gearbox that suits the aasd15a servo. Check out some of the recent rotary 6DOF builds via the Custom Google search box on the Recent page, filtered by newest, as many of those use that combination.
  6. Thanos

    Thanos Building the Future one AC Servo at a time... or 6

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    My Motion Simulator:
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    Read the description of my old page for the AMC-AASD15A controller, there are some example links to AASD servos and matching gearboxes that might help narrow down the search:

    https://www.tindie.com/products/tronicgr/amc-aasd15a-servo-motion-controller/
  7. incolor

    incolor New Member

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    Hi guys,
    Thanks for the information.
    I checked out your links @Thanos. Allot of good links.
    But regarding the gearbox. If i go with a design similar to the @Playsimulator's build:
    Isn't it more this kind of gearbox i need?

    (not sure if link is visible)
    https://www.aliexpress.com/item/32918920490.html
    Worm Reducer NMRV050 19mm input shaft 5:1 - 100 :1 Gear Ratio Nema 42 motor Worm Gearbox 90 Degree Speed Reducer
  8. Thanos

    Thanos Building the Future one AC Servo at a time... or 6

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    My Motion Simulator:
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    Worm gears are inefficient and usually have lots of "play" in the gears. Not the best way to go.

    But why not linear actuators? Why you want to make it mechanically complex?
    Linear actuator kits nowadays are incredibly inexpensive!! See here

    Thanks
    Thanos
  9. incolor

    incolor New Member

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    Hi @Thanos ,

    The scientific explanation would be I found the build thread and it looked very cool :) And I read that the more axis the more complex a build becomes.

    But to be honest I would like to simplify as much as possible. Maybe a 4 axis build with actuators would save me a lot of headache?

    Are that the kind of build that rests on this center pivot point or are the actuators strong enough to move the whole platform.



    Thanks Johan
  10. incolor

    incolor New Member

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    Hi
    The ones with one actuator in each corner gives a very stiff impression


    I found this design that I really like.
    https://www.aliexpress.com/item/33051153509.html

    Seems like a quite simple design also. Do you know if there are any good option of this side mounted servo design that is compatible with the AMC-AASD15A controller


    Thanks Johan
    • Agree Agree x 1
  11. seuszok

    seuszok Member Gold Contributor

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    Hi I was doing in that way. But believe me motor price is not the point when You finish rig.
    In mine case mechanism was begin from specify motors from wheelhairs but the time spend and money....
    If I will build another one I will take dc motor or servos and 50:1 gears like many others. If You dont want sopend lot of money do a 2dof first.
  12. incolor

    incolor New Member

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    Hi seuszok,
    I checked out your build thread. Very nice build!
    Do you have some idea on how much you spent?
    Yes I do agree that the line actuators are pretty expensive but servos seem quite expensive too.
    I think there will be only one build for me. So I guess I need to go at least half way in :)
  13. seuszok

    seuszok Member Gold Contributor

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    My Motion Simulator:
    3DOF, DC motor, Arduino, Motion platform
    You have nothing to worry, just dont think like me, than when You buy motors and seat its half job done :)
    Go in Your way, if some is too expensiwe but like it ...wait for it.
    I was don`t sopose that this device can take so much fun when I begining.
    Cost is some 1.5Ke for materials... mistakes, some tools etc.
    I jump on deep water better idea is start from 2dof but if You have skills mechanical and electronic... nothing stop You to do more custom build.
  14. Thanos

    Thanos Building the Future one AC Servo at a time... or 6

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    My Motion Simulator:
    AC motor, Motion platform, 4DOF, 6DOF
    If you want to avoid the headache of sourcing parts and have to also find tools to work on the material, there are some really inexpensive actuators similar to sfx100 out there, already assembled with everything, just pop on the rig and play...

    Thanks
    Thanos
  15. incolor

    incolor New Member

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    Hi Thanos

    Do you know if there are any compatible actuators with the design on the right side of the image. The racing lab seems to only offer the design on the left side?

    actuator.PNG

    Thanks Johan
  16. Thanos

    Thanos Building the Future one AC Servo at a time... or 6

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    My Motion Simulator:
    AC motor, Motion platform, 4DOF, 6DOF
    PT-ACTUATOR offers foldback actuators, same as on the photo. Contact them with the dimensions you need (stroke size, leadscrew etc)
    Last edited: Jan 24, 2022 at 16:38