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Showroom 3070W 6DOF Seat Mover (WIP Surge_Sway table)

Discussion in 'DIY Motion Simulator Projects' started by Pit, Mar 5, 2014.

  1. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    lol - @noorbeast
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  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Oops!
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  3. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    wow. I am using only low values (Kp=120 and PWMMax 160), because the rail platform is not connected to the wall and I am still a little bit afraid :p but this table rocks already - :popcorn


    PS: next week I will explain what I did, what was difficult and which gadgets I used. I am very happy that my concept seems to be successful yet - dunno what happens when the heavy rig lies on it.
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    Last edited: Aug 25, 2015
  4. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    today I wanted to test higher speed - and now I have run into the next issue: :(

    The motors stall into one direction at the beginning of a turn, only by pressing against the table - and notabene only a very light pressure...any suggestions?
  5. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    PS: this happens only if the turns are very abrupt, if the moves are smooth like a sine no problems...

    OK, I have more information: if the kp value is to high and only if the moves changes very abrupt then the motor stalls at the beginning. IMO by knowing the moves of racing simulation for surge and sway I need accelerating and not from zero to 100 in 1/1000 second...
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    Last edited: Aug 26, 2015
  6. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
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    I would check the usual suspects, motor stall current/driver shutdown. Maybe some smoothing would help? FI, I could never stop my surge table by hand.
    Last edited: Aug 26, 2015
  7. BlazinH

    BlazinH Well-Known Member

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    It would be helpful to know how much current your motor is drawing when it “stalls” to see if that could possibly be causing the driver to protect itself. In the mean time, have you tried reversing the motor wires to see if the problem reverses or stays the same? And lacking current readings you could also try connecting multiple drivers like you did the MM’s to see if more current helps.
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    Last edited: Aug 27, 2015
  8. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    The motors stall only if the direction of moving changes and the current is at 100%. Yesterday I tested LFS and it worked well even when I was bumping into the wall but had to reduce the Kp from 400 to 200 at full speed.
    Thank you for the suggestions, reversing the polarity I will check this out.
    Depending the driver I switched yesterday from a half-bridge mode to the single driver mode, because the latter does not damage the rig if only one motor stops due to a driver failure - that would be a fatal situation. I will try out one VNH only for one motor. Unfortunately I am going to France for the next few days so my tinkering has to be stopped...
  9. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
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    It certainly sounds like it needs more driver current.
  10. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    if so that would blame the drivers because the max. current of one motor is 7A (24V notabene).
  11. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
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    Yes, but their specifications have them drawing three times max current on start up + load inertia on a change in direction. Worth a try:).
    Last edited: Aug 27, 2015
  12. riton

    riton Active Member

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    you should try to put 100kg / 150kg (the weight of a pilot plus equipment) above ... seeing the engine I have a big doubt about the outcome.
    what is the power of these small engines?
    good luck ..

    is the maximum speed?
  13. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    tested today an additional load of 200kg including me (the tables are each more than 20KG, so at least 250kg weight) - the table speed is the same, nothing stops and I was afraid that the slabs would falling down. The issue of the motor stalling is only under max Kp and max PWMpower power when abrupt reversing, so I am very pleased about the test from today. Only worrying about the gears they hopefully do not break sometime...
    20150830_212010.jpg
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  14. Simon Husum

    Simon Husum Member

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    My Motion Simulator:
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    Sorry to interrupt..
    Just have to say..

    WHAT A FREAKING AMAZING YOU HAVE!!

    RESPECT AND KUDOS..

    :):thumbs
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  15. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    :eek::oops::confused::mad:
    PS: Derek added a heel-and-toe adapter which I use for the broken part. Derek is not responsible for the damaged parts, but I complained the scratches on the pedals and the craftsmanship finish (not tighten screws firmly)
    11948247_905577286188934_1202688111_n.jpg
    11921946_905577262855603_161774858_n.jpg
    11920472_905577212855608_1142843212_n.jpg
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    Last edited: Aug 31, 2015
  16. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Ouch!!

    How did that happen, I would have thought the shaft would withstand almost anything.
  17. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    There is a drilled hole in the shaft, IMO a big and fast hit has broken the shaft (like a bone...). Nothing else is damaged, Derek added a heel-and-toe adapter which I can use to repair the pedals (anyway at the moment I prefer heel-and-toe)
  18. speedy

    speedy Well-Known Member

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    My Motion Simulator:
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    Exactly :thumbs ...
    ===========================================================
    plus I have an Idea for the sudden abrupt motion stalles the motors at the beginning ... :nerd
    Add side springs to the rack ...
    like the springs in the clutch disk of the car ... absorbs/push/smoothen the sudden changes in the motor rpm .

    Untitled.jpg

    this will need to make the rack lateral moving a little bit as the spring length .
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  19. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    Many parts disassembled (the springs of the brake have not been very well adjusted, quasi oblique-angled) and assembled even in a different and wanted way, some screws have not been tightened before and I shorted the mini shaft of the clutch potentiometer for a wider angle. Now the pedals looks nice and I hope it will do the job :)
    20150831_131201.jpg
    20150831_131207.jpg
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  20. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    lol, indeed, you are the master of engineering - if my concept will fail I will be happy to implement your great idea
    :cheers
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