Converting my CS gimbal to a brushless gimbal

Discussion in 'Camera Mount Misc' started by Bill Collydas, Apr 14, 2013.

  1. RICHARD DEFARIAS

    RICHARD DEFARIAS New Member

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    Any one? Can I use 4S on the v1 board?
     
  2. Bill Collydas

    Bill Collydas Active Member

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    Yes you can Richard up to 20v not higher.
     
  3. RICHARD DEFARIAS

    RICHARD DEFARIAS New Member

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    Thanks for the info bill, do you know how should I start with the power numbers for 8017 and 8102 motors?

    Thanks
     
  4. Jordi Cristofol

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    Steve you were right, the new one (v2) has no i2c errors and seems to work fine. Tomorrow i will try. Thanks.

    jordi
     
  5. David burdeny

    David burdeny New Member

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  6. Urs Clement

    Urs Clement Member

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    Hey guys...

    I've got an issue with my new built 3axis direct driven gimbal. It's a mix, i used the 2 axis parts from the DYS eagle eye gimbal and for the pan i bought a pan motor cage with a dys bgm8108-90 motor in it.
    Roll and tilt are rock steady in flight, but i struggle with the pan. in my dry tests on the ground the pan works great, i can tilt the gimbal 40° and control it via the operators Tx without problems, but as soon as i go up in the air the pan starts cogging left and right, like it did before i got the "right" PID's on the ground. I have to wait for the bluetooth module, before i can do some quicker in-flight PID changes, now i have to land it and connect to the laptop, set new value etc... what really takes a lot of time, so maybe i simply havent' found the right values yet.

    The gimbal is balanced very good and not affected by vibrations from the MR, i've tested this several times.

    Now my question: Do you guys think the downwind of the MR motors could affect the landing legs in that way, that the yaw axis begins to struggle? I use a flat CS 8 with 450mm booms and 14" Tiger props. Could this be the problem or do i still haven't found the right PID values?

    Thanks for any help!
    [​IMG]
    [​IMG][​IMG]
     
  7. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Urs:
    [EDIT: I thought you were using a MōVI, but then I realized you were not so edited this posting.]

    Can you confirm that, with the CS8 on the ground, and tipped up so that it's resting on two of the boom ends on the ground/table (in other words the booms are in a vertical plane), that you can rotate the EDIT MōVI the gimbal into any arbitrary angle and it will stay there?

    EDIT: My guess is that the pan motor is not receiving a high enough current to hold the mass of the gimbal and so the gimbal is overpowering it. The propwash may indeed be enough to buffet the gimbal beyond the holding power of the pan motor.

    Thanks
    Andy.
     
  8. Urs Clement

    Urs Clement Member

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    Dear Andy,

    i haven't tried it with the gimbal on the CS, only mounted to a speaker tripod. Yes i can confirm that, but it's not a Movi! it's something selfmade, as you can see in the pictures...?

    Regards,

    Urs
     
  9. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Urs:
    Sorry -- I edited my post when I realized it was not a MōVI -- so see the blue text of my posting.
    Andy.
     
  10. Urs Clement

    Urs Clement Member

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    Andy, yes i saw it right after i wrote.... Thanks for your thoughts. Do you think i haven't given enough power to it by the software or is the alexmos not able to get enough current to such big motors? I'm building right now a serial bluetooth module, so i hope i can do some inflight tuning tomorrow.

    Thanks again!
     
  11. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Hi Urs: I'm not really sure. I don't know much about Alexmos as it's not a Freefly-related product, I'm afraid.
    Andy.
     
  12. Urs Clement

    Urs Clement Member

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    I solved it, i simply had wrong PID's and Power. Could adjust it in-flight via bluetooth... Thanks anyway for your help!

    And to all: i really can recommend this gimbal. It costed me 600$ for the eagle eye handheld (with original basecam alexmos), 200$ for the pan cage and 180$ for the motor. Everything ordered from china.... All booms and the legs are the original freefly ones. So if you want a really cheap 3axis brushless gimbal, i recommend this mix!

    Thanks
     
  13. Dave King

    Dave King Well-Known Member

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    Hello Urs

    Would you mind posting your before and after PID for the PAN when you were having the issues and what you corrected them to its a reference for others who may run into a similar issue?
     
  14. Urs Clement

    Urs Clement Member

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    EDIT

    as promised, here are the PID's i used for my gimbal:

    https://dl.dropboxusercontent.com/u/12574832/PID's.jpg

    First I only gave 155 Power to the pan motor. It works good with 190 now, the PID's are quite good. Here is a link to a footage video, i've cutted it because i was hovering the most of the time. No post-stab!





    The Pan works quite good, there are little jitters still there, but most of it what lookks like jitters in this video is because of the youtube compression. Still need some fine-tuning, but looks promising.

    i hope this values and video helps someone.

    Camera is the Sony a7r with the Sonnar T* Zeiss FE 24-70F4

    Cheers
     
  15. RICHARD DEFARIAS

    RICHARD DEFARIAS New Member

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    Good morning?
    Have a question. I just finish my gimbal with 2 8017, pan and rol and 2 iPower GBM5108-120T on tilt. MY question is: when 2 motors are used for tilt, do I have to double the amount of poles?

    Thanks
     
  16. Mateusz Hajdziony

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    Nope, what you need is connect the two tilt motors in parallel, but with cables switched so that each motor turns in different direction (since they are going to be mirrored). What's really important is to align the two motors together so that their stators and magnets mirror each other. This can take a bit of trial and error. The motor pole count in the settings should be set to mimic only one motor. The controller acts as if there was only one motor.
     
  17. Reno Rieger

    Reno Rieger New Member

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    @Urs
    What Camera are you flying with?
     
  18. Urs Clement

    Urs Clement Member

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    Hi Reno,

    For now we shoot with the Sony a7R, but as soon as we get it, we're going to upgrade the gimbal for the BmPC4K
     
  19. Bill Collydas

    Bill Collydas Active Member

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    For the gb-85 I start at 170 and go from there

    Bill
     
  20. Bill Collydas

    Bill Collydas Active Member

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    Sorry guys I have been absent for a bit due to a passing in the family.

    Bill
     

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