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Home Made 2DOF study/realisation

Discussion in 'DIY Motion Simulator Projects' started by 17Nico17, Dec 30, 2017.

  1. 17Nico17

    17Nico17 New Member

    Joined:
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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Hello Everybody!

    Before I begin, I introduce myself. I am Nicolas, and sorry for English speaking people, I am French :D, trying to present my project as I can.

    It will not be very special when I see some huge beasts on this forum. Some of you have really astonishing installations!! :cool: The idea is to build a 2DOF with the possibility to make it evolve 3DOF and even 4DOF in the future ;)

    I am using CATIA software in my job so for the moment, I am currently designing the main frames of the simulator. Here a quite "old" config :

    upload_2017-12-30_21-17-6.png

    After some research on the internet, I have what I need regarding electronic components thats is to say, SABERTOOTH 2x25A + Arduino UNO + potentiometers + program C language.

    upload_2017-12-30_21-17-46.png

    I have already done a LEGO model, with small electric motors, to be sure that I will not launch something I cannot do due to electroical mostly (not my best competencies). Hopefully, my C program (Wanegain one, thank you again!) and the link with Simtools is alright then :) I was like a kid behind the LEGO plate moving following the LFS gaming values :D:D

    So I really want to thank all the guys which participated to develop this software because it is something I wanted to do for several years and it seems to be possible now thanks to you ;)

    I have begun the construction...

    Pictures are going to follow slowly (I cannot work every day on the project and I want to work properly ;) ) :arrow :arrow :arrow :arrow :arrow

    Attached Files:

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  2. Ads Master

    Ads Master

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  3. paulopsx2

    paulopsx2 Active Member

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    My Motion Simulator:
    2DOF, Arduino, Motion platform
    hi nico...Did you calculate the weight of the whole structure, including you, the tv and the accessories? I say this because from what it is showing, it seems to me that the total there can exceed 250 kg, electric motors rarely manage to push all this.
  4. ruba

    ruba Member

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    My Motion Simulator:
    2DOF, 3DOF, Arduino
    What motors do you plan to use?
  5. 17Nico17

    17Nico17 New Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Hi Paulo, Ruba

    It is an excellent question! I have also thought about this problem. For the moment, the "suspended" assembly is scheduled to weight 135-140kg maximum, pilot included.
    - The main frame which hangs the seat is only 10kg. Will be made with 25x25x2 square S235 Tube.
    - I expect 15kg maxi for the seat. I will search it this evening. I practice Off Road Rallying, easier to find some parts :D
    - For the wheel + pedals + gears, approximately 7kg
    - The pilot 80kg (yes a strong one :D)
    - Plus rod-ends, links, screws, nuts, welding etc.. I reach 135kg approx ;)

    I was wondering if the motors would be sufficient. For the moment, I try to reduce the distance between the CoG of the suspended package and the center of rotation. I think that if this distance (vertical one) is high, the motors are going to b overloaded more easily when there is a change from left to right for example (rolling).
    Of course, the center of rotation will be in line with the CoG to be stress free on my engine in horizontal static position. ;)

    For the moment I have one motor of RENAULT MASTER II. A french little truck. Working in 12v. Power unknown but seems quite strong. I have begun the installation of the gearing system for the potentiometers. I wanted to have something adjustable, strong and reliable! I do not want to die on my simulator :p:p

    upload_2017-12-31_11-3-24.png

    Do you have an idea of the maximum weight for thise kind of motors? I know that the inertia is an important parameter but an approximated maximum weight can be a good clue ;)

    Thanks for your replies and your interest :) I have done some work already on the motors and for the main structure. I just need to put some pictures and explainations of what I want to do :)
  6. 17Nico17

    17Nico17 New Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Hi Everybody,

    The 3D model is now well advanced. o_O
    The main frames are finished. You can see 4 motors in the model. For the moment I will only use 2 (2DOF). The other one are in prevision of an evolution to have translation + rotation Z axis (vertical).
    [​IMG]
    [​IMG]

    The seat will be maintained in position like that, using a ball joint at the center. I want to have the possibility to had rotation Z (vertical) later. And also translation Z (the spring is here to limit the loads on the motors and calculated to counterbalance the weight of the moving assembly in medium position. Will need a preload :p:

    [​IMG]

    The gearing system for the potentiometers. You have the real one in my previous post ;) Ratio x3. The motor support is done using square tube 150x150x3 cut in two halves or a 3mm rolled form plate :
    upload_2018-1-2_10-41-22.png

    I will base my work on that model to build the simulator.

    Thanks to you Paulo, I have reduced the lenght of my "rods" (which actuates the simulator). They were 60mm long, I passed to 50mm to reduce the loads on the motors. I loose some ° of inclinaison but I prefer beginning slowly with the motors :D :D

    To be continued.... :)
    • Like Like x 1
  7. 17Nico17

    17Nico17 New Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Hi Everybody,

    Even if I havent so much answers, I continue sharing my work ;)

    Here some pictures of the simulator! After the 3D and 2D, just to follow the plan :

    upload_2018-1-22_16-42-30.png
    upload_2018-1-22_16-41-7.png
    upload_2018-1-22_16-41-31.png
    upload_2018-1-22_16-41-54.png
    upload_2018-1-22_16-43-49.png
    upload_2018-1-22_16-43-12.png
    upload_2018-1-22_16-44-12.png
    upload_2018-1-22_16-44-35.png

    Next steps next time :p
    • Like Like x 1
  8. 17Nico17

    17Nico17 New Member

    Joined:
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    My Motion Simulator:
    2DOF, DC motor, Arduino
    That's done! :p The first tests of the simulator have been done and it was so good to see this beast move front/rear and laterally after so much efforts!
    The Renault Master I et II motors are strong enough!!
    ;)

    Here some pictures of the construction as usual. I have some videos of the tests but it will be only photos here :

    Some modifications to isolate the motors: :eek:

    upload_2018-3-13_19-12-40.png

    Potentiometer ready to be installed:

    upload_2018-3-13_19-13-39.png

    Seat fixture system: :cool:

    upload_2018-3-13_19-14-35.png

    First non finished installation to test the prototype. The TV is the next step! But it is working!

    upload_2018-3-13_19-15-37.png

    My brave cousin, ready to test the simulator for the first time (only a picture of the video):
    upload_2018-3-13_19-18-19.png

    Already some improvements to bring. The rod is too small, there will be more sensations with a bigger one. The motors are strong enough to lift everything so I can afford doing that:

    upload_2018-3-13_19-20-22.png

    Next step is to test with a real Rally Game!!! :D

    Attached Files:

    • Like Like x 1
  9. ferslash

    ferslash Active Member

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    4 small motors will lift all the weight??? wooow
  10. 17Nico17

    17Nico17 New Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Hi Ferslash! They do not lift all the weight ;)

    For the moment, it is a 2DOF. The two motors are just here to create the desequilibrium. The ball joint has been placed just at the CoG of the system counting a 80kg player :)
  11. Huseyin CATALBAS

    Huseyin CATALBAS New Member

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    Turkey
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    My Motion Simulator:
    2DOF, 3DOF, DC motor, Arduino, Joyrider, Motion platform
    Hi 17Nico17! I am very interested in your project. I want to make a similar one too. What is the latest status? Have you added the other motors? And you just uploaded the pictures. Will you add a test video to the topic? Because im wondering how it works. Thanks for the nice information you shared with us.
  12. 17Nico17

    17Nico17 New Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Hi Huseyin!! Oh la la, I only see you post today... Never seen that I had an answer on my topic.

    Yes, of course I have some pictures of the simulator. I came here to see what I added because I am doing some new stuffs and I will integrate the evolution here in this topic :)
    If you still have some questions, feel free to ask if this is not too late. ;)

    So sorry to have missed your post... :(
  13. 17Nico17

    17Nico17 New Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Some more pictures about the end of the fabrication (see below attached).
    You will also find some information inside my post. On electrical warnings and motor information. I share my experience for the new builders :):):)
    Here some pictures for the "finished" simulator even if these beasts are never really ended^^ always some evolutions to bring!

    upload_2020-5-2_11-22-53.png

    As you can see, the base was already improved. Normally flat, I have added some uprights to place rods between them and stiff the base. The simulator was so "brutal" it bended the base. The base is 25x25x2 mm square tubing. Thanks to these rods, the base is now very rigid and bring a good plus for the sensations!

    After that I have brought other improvements. I had a failure on the port motor so I decided to double the motors. Two per sides. At the beginning the motors were linked by a flexible link. But not very good for load distribution between both motors. In fine, I decided to have a rigid link but with a sort of home made clutch to limit the torsion between the two axles of the two motors and slip if necessary in case of motors rotary speed difference. Also improved the rods to have more adjustement and a better look. All created by hand!

    Before and after :

    upload_2020-5-2_11-29-6.png

    Clutch system, torque limitation controlled by the preload of the springs :

    upload_2020-5-2_11-29-53.png

    Checking of the complete system.
    WARNING : I had many issues with the electricity! Even if I used plastic plates to fix the motors, I had some interferences and this was a problem for the G29 wheel / pedals! Many issues before I understood I had to isolate each motor to be ok with this. Issue on pedals were a non constant feedback and wheel was stuck starboard side from time to time.... I thought it was the TV screeen at the beginning but no... It also caused connexion breackings with the arduino.. I last maybe 30h installing, removing, installing again, removing again the TV screen and everything to understand it was simply the motors. :think:think

    Here the complete axle system. One motor on one side, the other one on the other side. 4 motor in all :

    upload_2020-5-2_11-35-14.png


    New home made system for the potentiometer. Better fix and easier to adjust :

    upload_2020-5-2_11-36-7.png

    Ready to work. Even if I made another part to hang the third point free on the picture :

    upload_2020-5-2_11-37-14.png

    INFORMATION : Also made some tests to know which motors were the best! Impossible to have these information on the internet. Here what I found : :p:p:p

    After many tests to know the motors that have the best torque using a rod and differents weight at the tip of the rod (see pictures below) these are my conclusions :

    Best torque I had motor stopped : 28 N.m (Renault Master 1, the less old of this first generation)
    Average "good" torque for a good motor : 20-22 N.m (generally Renault Twingo / Clio II / VW Polo)
    Lowest torque I had (on the big big motors you see on the picture on the right) : 7 N.m (Renault Master I 1981)

    What I seen : generally the more the motor is old, the more it is "weak". :eek: Even if you find a very big motor on a 1980-1985 car or truck, I advise to let it, not a good choice. ;) One of the best I have is the Clio II 2003 motor. It is the most little and one of the stringest regarding the torque.... I guess that the age is important because of magnetic properties, but this is just a theory from me.

    upload_2020-5-2_11-39-32.png upload_2020-5-2_11-39-55.png

    After many hours of game, I had a failure on a flexible link (black rubber stuff). I decided to mount on rigid as I said above. ;)
    After that, no failure for a long time. Just some unscrewing issues. That is why I decide to change the system.

    Some information to follow but for the moment with Covid-19 virus, no progress as I miss some material. :confused:

    Hope this will be usefull for somebody on this forum!! Have a good day ;););)

    And see you soon!!! :D:D:):)

    Attached Files:

    • Like Like x 1
  14. Peter24

    Peter24 New Member Gold Contributor

    Joined:
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    My Motion Simulator:
    2DOF, DC motor, Arduino, JRK
    Hi 17Nico17,
    Have You try to measure motors from power steering? I just buy one from Opel Corsa B (P20008 GM NSK) but I don't check, yet...
  15. 17Nico17

    17Nico17 New Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Hi Peter!! I thought about using some, that is a good idea I guess! But to answer your question, no, never used them. For me they are at least as powerfull as the ones for the wipers. If you test them, I would be curious to see the resultas ;)