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SCN5 Simulator Build - The Beginning

Discussion in 'DIY Motion Simulator Projects' started by apsydsim, Apr 10, 2010.

  1. apsydsim

    apsydsim New Member

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    Hi All,

    I am sure I will run into some challenges along the way but here we go with the beginning:
    The Rough Target
    [​IMG]
    I will be taking the critical dimensions from:
    building-a-proper-motion-base-for-scn5-s-t2216-20.html#p21174 as specced by bvillersjr.

    The Parts
    [​IMG]
    2 x SCN5 Actuators and Covers

    [​IMG]
    Lots of Ball Joints

    [​IMG]
    1 x Seat

    12M of 20mmx20mmx2mm Square
    1 x Steering universal joint (still to be acquired)
    1 x G25 Wheel, Pedals etc
    1 x Computer
    3 x 24 Dell Monitors
    The tools
    1xCutoff Saw
    1xMig Welder - inc instructional dvd...
    Welding tool kit - apron, gloves, magnetic jigs etc.

    The Start Of the Build
    [​IMG]
    The seat base....
    With the seat on:
    [​IMG]

    Hopefully I will get a move on and get into the fun stuff.

    Cheers,
    AP
  2. bvillersjr

    bvillersjr Active Member

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    Good luck with your project! If I may make a suggestion... it would be best to use a fixed seat! A seat with an adjustable back not only flexes alot and causes you to miss out on road surface feeling, but it also allows the pivot point to be altered which can cause actuator damage.
  3. apsydsim

    apsydsim New Member

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    Bernard,

    Thanks for the suggestion.

    I can't easily get a fixed one, but I can fix this one.....

    Cheers,
    AP
  4. Nima

    Nima Member Gold Contributor

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    hi,
    do you want make a joyrider for racing or airplan?for race is it many better to use
    only the seat.with a joyrider you mast move more as the dobble way for the same feeling. i have the same seat and i love it.befor i have use a sparco but i dont can drive a long time with the sparco.
  5. johnfatboy

    johnfatboy New Member

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    great start :)
  6. apsydsim

    apsydsim New Member

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    Getting closer to a dry run....

    [​IMG]
    A veiw of the seat on the base, with pedals mounted.

    [​IMG]
    The Base, with pedal mounted, central pivot, rear actuator frame mount.

    [​IMG]
    A view from the pedals back, without the seat on.

    Still to do:
    - Steering wheel and gear lever mount
    - ends on the base frame
    - mount the bottom actuator frame (ideally on rubber).
    - lock down the universal some how (a bolt I think).
    - try it out.

    Cheers,
    AP
  7. apsydsim

    apsydsim New Member

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    Completed the base frame yesterday, with the steering wheel and gear lever mounted.

    It now looks like from the back:
    [​IMG]

    From the side:
    [​IMG]

    A view from the drivers seat:
    [​IMG]

    It kicks and bucks a fair bit, and I haven't got it worked out totally yet.

    It does a good job of simulating the bumps and kerbs just gotta get the other forces sorted.

    I tried to limit the profiles to 25% but it felt like it was using a lot more. So now I have to learn more about the profiler as I thought I knew how to change limit the profiles. I might have a look for a couple different profiles.

    Cheers,
    AP
  8. Nima

    Nima Member Gold Contributor

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    hallo
    Your SIM MÜSSEN Wege Zwischen der Spitze des scn5.how viele Wege in cm mutch tun, Haben Się jetzt?

    Attached Files:

  9. Nima

    Nima Member Gold Contributor

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    hi,
    and i see you have a joyrider design.for a joyrider ou have many to low
    movement.you only move 8 or 10 degree for and behind.this is perfect for a
    raceseat (the wheel and the paddels not move with the seat).for the same feeling you mast have 25 degree.(but i mean the 8 degree on a raceseat is better as the 25 on a joyrider).my sim have a joyrider and a raceseat sektion.
  10. apsydsim

    apsydsim New Member

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    Nima,

    The top bar is around 300mm(from recollection)
    Yep I agree, more forward and aft movement is required...

    Here is a video of it in action.

    [​IMG]

    To get more forward and aft movement I need to move the seat more upright, then pull the upper actuator mounts forward. Possibly even raise the whole seat rig a little more... depending upon how much clearance under the pedals I need.

    Time to get the tape measure out...

    Thoughts?

    Cheers,
    AP
  11. Nima

    Nima Member Gold Contributor

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    hi,
    if you want more movement the scn5 are to small.
    the best way is you cut the wheel and baddels and move only the seat.
    than you becomm the feeling from your muskels.is a better an many more realistic feeling for car simulation.
  12. RaceRay

    RaceRay Administrator Staff Member SimAxe Beta Tester

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    My Motion Simulator:
    2DOF, DC motor, SimAxe, SimforceGT
    If you dont want to move only the seat as nima suggested and want to move the LCD in the future as well (Otherwise that setup makes no sense imho) you should mount at first the LCD to get proper weights in front and back to get your simulator in balance before you try to change the angles.

    I would not recommend the SCN5 for a joyrider-like simulator with more travel you use currently. They are too weak. The inertia could get too strong, so that the actuators do not brake early enough and hit there endpositions hard and brake.

    For more safety, nima uses rubber bands to create a counterforce and to prevent damages of the actuators. Although i think it is not optimal, because you cannot calculate easily the necessary rubberstrength and rubber looses forces about long time, it is a way to prevent any damages.

    Br
    René
  13. Nima

    Nima Member Gold Contributor

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    hi rene,
    the rubber bands not only for safety in the most for better effects.and the work is very nice.
    only the look is bad.in the next i test with springs.after change my seat i have drive without
    rubberbands and is many more realistic feeling with rubberbands i love the rubberbands.
    you have drive my sims and i mean you never have drive a better simulation.
  14. RaceRay

    RaceRay Administrator Staff Member SimAxe Beta Tester

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    My Motion Simulator:
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    Hi Nils,

    ich bin nur auf den Sicherheitsnutzen deiner Gummies :D eingegangen. Simulationsrelevant stimmt ich Dir zu, dass die Dämpfungseffekte den Realismus enorm steigern und ...

    Ja, ich bin noch keinen besseren Simulator gefahren 8)

    Grüße, René
  15. apsydsim

    apsydsim New Member

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    Cheers for the thoughts....

    After playing with it a little more, I am pretty happy with the concept. I know it does not simulate the g-forces as well as other methods, but it is fun.

    Anyway further work is required on the rig, as I watched it in action with some friends driving it over the weekend.

    Given the flexing it is getting I am surprised that a couple of key welds around the top actuator mount haven't given in.

    Anyways a little more tinkering and I will get there.

    Cheers,
    AP
  16. apsydsim

    apsydsim New Member

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    Hi,

    I have been busy with the welder and now the platform is rock solid. I added a trussed member to the seat base and linked that to the pedals. Also braced the top actuator bar, and put in two rubber door stops at the junction of the seat and the top actuator bar, which both stops the seat fabric from being torn and allows the seat to be pushed hard up against the actuator bar.

    Also I have put in two rubber motor mounts for isolation on the bottom actuator bar.

    Now the concern that I do have is that the centre of gravity is too high in relation to the central pivot and top actuator mounts.

    Anyway's some more photos and video will follow, with some measurements for further discussion.

    Cheers,
    AP
  17. apsydsim

    apsydsim New Member

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    To remove the flex I have run a second set of bracing:
    New Front View:
    [​IMG]
    Rear View(including vibration mounts):
    [​IMG]


    Some of the strengthening:
    [​IMG]

    I am experiencing one challenge with the yaw movements where I think the Center of gravity (with me in it) might be too high and overloading the actuators.

    Here is a picture of the seat base to pivot:
    [​IMG]
    Total height available is around 60mm....

    So seat height of 80mm + 60 to pivot + person C of G (to a bit above the belly button = say 200mm)

    Here is a pic:
    [​IMG]

    Not sure if the movement would make much difference? Any thoughts?

    Cheers,
    AP
  18. Nima

    Nima Member Gold Contributor

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    hi,
    a higher pivot point is many better.but the 0,42 on the top is to mutch.use 0,22 -0,25 is many better feeling.
  19. apsydsim

    apsydsim New Member

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    Ok so the sim is now inside, and I am working on getting the bugs out in the relative warmth of the house (rather than the <10 degree C garage).

    Anyways I am getting an Alarm code of 70 on the actuators when using the profiles part way through the tests, so I need to do some digging on that.

    I need to tweak the profiler and SCN5 settings I think.

    Cheers,
    AP
    P.S. the triple 24's are much nicer to look at than the single 17...
  20. bvillersjr

    bvillersjr Active Member

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    I'm going to look into this alarm code, but I suspect, that the actuators are being overloaded and may be in danger of internal damage. Please use caution while testing and test in small increments using the method I suggested in the tutorials section of the wiki.