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Showroom A small 2dof attempt from Argentina

Discussion in 'DIY Motion Simulator Projects' started by Norman454x, Aug 1, 2020.

  1. Norman454x

    Norman454x New Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Hello everyone, first of all I would like to clarify that I do not speak English. So I will write everything in my language and then pass it to google translator. I am sorry if there are inconsistencies.


    I am from Argentina. I want to present you my little project already a little advanced. I didn't realize documenting all the progress ... but hey, there are still things to do. Here are some photos of the project currently.

    I have built a separate module to put the steering wheel, handbrake and H-shifter and sequential (maybe introduce the reducer function for offroad games, there is not much space)
    It is not finished, the electronic part of the levers is still missing. Then it will be carpeted


    I have built the selector in a very rough way. Suppose I was going to carry the complete selector of a motorcycle, but it did not work, so I had to improvise and make a simple zipper that would make something similar. It looks like it's dirty and rusty, but it's just paint.
    The handbrake works with a motorcycle shock absorber. I'm still wondering whether to do it analog or just with a button. The lever has a lot of travel.


    This is the complete structure, nothing complicated, I think I could have made it more compact, but I was afraid that it could tip over


    And these are the engines that I'm going to use. They are authentic beasts, very fast, strong and with a nice build quality.




    With the axle levers I had to improvise with recycled things. I have welded the splines of a motorcycle crankshaft to the axles. Then I have cut in two the gear that is attached to the crankshaft and with that I have built the arms. It is not very pretty (it needs painting), but it works very well.





    I also had to upholster an armchair that I bought second hand. It was in very bad shape. It wasn't great, but at least it looks decent




    This is how it looks finished, with the module on and the peripherals.






    And the potentiometers ... well, I had problems putting them directly. The range far exceeds the mechanical travel that the connecting rods must have. So I opted to put them with some type of reduction and a strap (it had gears, but they have a small clearance) later I will spend that rubber to reduce its radius and thus arrive at a ratio of 2: 1 or 1.5: 1 The idea is to use 100% of the potentiometer range in the useful travel of the arms. The strap is not exactly a strap either. It is just a piece of cooked cloth. In short, it does not make any force or tension, it only has to transmit a little movement








    I have not tested it with me yet, however, here I have a video of the movement of the motors. It looks great compared to my old wiper motors



    Attached Files:

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  2. Ads Master

    Ads Master

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  3. Norman454x

    Norman454x New Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Well, I've already been able to test the structure. At first I tried it alone, but it jumped everywhere so I had to get on. It seems to work fine, however it makes such a loud noise that it looks like it will break. After someone else tried it, I realized that the noise is the connecting rods. So I decided to change them for some car links.


    [​IMG]


    [​IMG]



    I cut them to match the measurements of the other cranks

    [​IMG]
    [​IMG]
    [​IMG]


    The worst part was welding the ball joint to the structure. I had to cut the screw first to match the length. Fortunately the paint was not damaged too much. With a few touches it is solved



    [​IMG] [​IMG] [​IMG]





    I also had to rebuild the arms. By the way, they are 8cm from center to center



    [​IMG]

    [​IMG]


    I take this opportunity to show you the motors since I had to disassemble the electronic part.


    [​IMG] [​IMG]


    Tomorrow, with a little luck, I will be able to test them to see if it is quieter now. Sorry, at the moment I can't afford to pay for the license. So I am using another program to move the simulator ... is there a problem if I name it?
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    There are some limitations on new members to prevent spam, one of them concerns external links, so your images do not render. Instead directly upload and insert your images into your post, see the FAQs here: https://www.xsimulator.net/community/faq/upload-pictures-or-files.81/

    You can name whatever you use.

    SimTools has the fully functional plugin for Live for Speed included in the demo version, specifically for testing purposes, so if you want give that a try.

    Conditions apply for eligible members to apply for a free SimTools DIY license, in your case note the membership timeline: https://www.xsimulator.net/community/faq/request-a-free-diy-simtools-2-0-license.262/
  5. Norman454x

    Norman454x New Member

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    Got it.

    I wanted to edit the above message but couldn't find the option. So here I leave the corresponding images.

    At the moment I was using the X-sim, mainly because I wanted to try the Dirt rally, but it is very aggressive, so yes, I will try the LFS
    • Like Like x 1
  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
    3DOF, DC motor, JRK
    • Like Like x 1
  7. Norman454x

    Norman454x New Member

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    Hi all. Unfortunately, the connecting rods did not work well on the first attempt. They were crossed. So I had to modify the arms so that the geometry was more or less good.

    What I did was cut a part of the arm and add a sheet so that the kneecap was more outside. It wasn't perfectly aligned, but I think it will work well with that freedom.

    The objective was reached. The ball joints do not make any noise compared to the other connecting rods. They work super smooth and without any slack. I also reduced the radius of the potentiometers


    Still, I tried it and it turned out to be too brusque, but bearable. Then another heavier person (98kg) tried it out and I noticed that one of the motors was starting to trip. I imagined that there was not enough current, so I installed a third source of 30 A. In the end it was left with 12v / 90A.


    But ... now it's unmanageable. If he was strong before, now he is insane. The banging noises returned and now the structure comes off the ground, making it impossible for me to use all the useful travel. First of all I am going to have to improve the leg system because right now it cannot be used. At this rate it will break the floor.

    I think the problem is that the arms are very long and the motors very fast. And I was thinking of connecting them to 24v so they get less hot, but it seems unfeasible

    Well, I still haven't had time to test the Simtools software. Do you think that the motors can be made to work in the same range and speed but with less force?

    Attached Files:

  8. ferslash

    ferslash Active Member

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    what are your new motors from? they looks huge!

    regards

    fer
    Last edited by a moderator: Aug 6, 2020
  9. Norman454x

    Norman454x New Member

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    Hello, these are Toyota Corolla electric steering motors. They are great, small in size compared to the power it offers. I'm not sure, but I think they are around 400w, maybe more. The only disadvantage they have is their ratio (I have not measured it, even so, they are very fast, I guess above 100 rpm). That and it only offers two holes for the anchors.

    I wanted to record a video, but I can barely use a percentage of the useful route because it was very aggressive. So I'm going to modify the ball joints again. I will try to put a spring in the middle so that it absorbs shock so it is softer.
    Last edited by a moderator: Aug 6, 2020
  10. Norman454x

    Norman454x New Member

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    Here are some advances. I would have liked to upload the finished work, but I don't have much time. Now it will be more difficult.


    As I said before. I plan to insert a spring in the middle of the connecting rod shaft to absorb the shock from the motor. Because basically the motors do not "move" the structure. What they do is hit it like an impact wrench. It is not pleasant and it seems that everything is going to break. In fact, all the electronic devices got out of place and hit the fan. They even loosen the screws that hold the motor and the sequential lever


    They are all recycled. These are shock absorbers from a mini quad. What I need is the stem and damper body to get that little movement. At first I was going to use valve springs but they are a bit big so I opted for clutch springs. I cut them in half

    IMG_20200806_220330.jpg
    IMG_20200806_220912.jpg
    IMG_20200806_221353.jpg
    IMG_20200806_222846.jpg
    IMG_20200806_222856.jpg
    IMG_20200806_223037.jpg
    IMG_20200806_231437.jpg
    IMG_20200807_102753.jpg


    The complicated thing is going to be to cut the connecting rods and weld it ... I am not going to disassemble everything so I am going to try to weld everything with assembly


    And this is the gearbox I plan to use. It's not pretty, but it will be when it is all upholstered and forms a console. Additionally I want to put a second gearbox for the 4x4 high and low gears and the differential locks. Just because I love Beam NG. The shaft is composed of a cardan joint steering



    IMG_20200807_102350.jpg IMG_20200807_102508.jpg IMG_20200807_102430.jpg AKcnlMiAk2VKTP82UzAM_g==.jpg

    Attached Files:

  11. Norman454x

    Norman454x New Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    Well after a while I finally got the sim to work properly. Here you have a video so you can see how much it moves. At the end the rods works with the clutch spring in the middle. The response of motors is limited by the software because without that the movement is too agresive.






    I'm happy with the results
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