JAW axis shakes and only one IMU
  • Hi everyone.
    I would like to ask you for a little help with my gimbal. I own Sky Glide Cinema gimbal (http://skyglide.eu/en/sky-glide-cinema-2/). And I'm having troubles with JAW axis. I keep getting this shakes.

    I have to point out that it has only one IMU. I contact the SkyGlide company and the support guy said they won’t take back this gimbal even though he himself said that this gimbal should have 2 IMUs. I’m missing Frame IMU, so all I have is Camera IMU.

    I’m not that skilled with gimbals yet. I tried a few variations of PID but nothing really helped.
    As you can see in video below, Gimbal is balanced as it should be.

    I’m using gimbal with BMPC4K and Canon EFS 18-55 (most of the time) or Samyang 16mm.

    Am I missing something? Can you help me understand why is footage still this shaky? On JAW axis?

    PID settings 1 (FrameIMU enabled):

    photo 1_FrameIMU.jpg

    Test Footage 1:

    PID settings 2 (FrameIMU enabled):

    JAW POWER 200. Made a mistake and gave you the wrong print screen.
    photo Untitled_1.jpg

    TEST footage 2:

    PID settings are the same as #2 only FrameIMU is disabled.

    TEST footage 3 (FrameIMU disabled):

    Every time I use my Gimbal I have to apply Warp stabilizer. In most cases it helps. But I can’t rent this gimbal because everyone expects it to work better. Without so obvious JAW shakes.

    And how big of the difference can FrameIMU make? Is there a huge difference in having FrameIMU or not?
    Thank you.

    PS: Sorry for the blown out footage. We were in a hurry.
  • Ensure that also Yaw is balanced.

    Remove adaptive PID tuning, try to tune for higher PID, now your values are quite low. try to use also higher power, but take care that motors do not get hot. If you find a way to support the camera better, it will improve the result (supporting camera also from top)

    When the gimbal is working ok, you can add back the adaptive PID tuning if you like. (but I do not usually use it)

    You must also tune the follow yaw settings to your liking and practise moving with the gimbal.

    You should not need any Warp stabiliser.

    When the gimbal is operated normally, on normal position, frame IMU does not make a big difference, but maybe you want to get and install also frame IMU, that will enable using the gimbal more freely.

    Make sure gyro is calibrated always when using the gimbal in different temperature. If it is calibrated inside, it needs to be calibrated if operated outside and temperature is different (unless temperature calibration has been performed.)

    Make sure also accelerometers are well calibrated, preferably 6 point calibrated. It is usually enough to do this only when the gimbal is installed and taken into use, but time to time if there is any problems it is good to reperform it also, and there is also temperature calibration available. Your problems are likely not because of accelerometer calibration.

  • Thank you. I'll try to do that. I'll report my findings in a few days.
    Thank you again.
  • For PID you should get pretty good result with the auto tuning. first set it to good stability and tune one axis at time. Hold the gimbal like normally when operating it when auto tuning, but do not move it much during the tuning.