I have noticed in the past several flights that my 2-axis gimbal's roll has been shaky. I checked Radian gains, balance, and all the regular stuff. I also noticed that the roll servo appeared to be slightly bent, meaning that the pulley was not perfectly parallel to the large wheel. So I figured that I had bent something on one of my rougher landings. I almost went ahead and ordered a new servo, but this morning I checked the play, and realized that the hex screw that holds on the pulley was loose. Not only a little. But at least a full 360° turn loose. Oy. Just flew in a really stiff wind, and it's way more stable. Sigh.
Good to see roll is a bit more stable but what I see is what others here are experiencing...slight roll jitter. Has anyone solved this yet?
My gains were set too high because I didn't change them from where I had them for the 5D Mark III. If the wind calms down a bit, I'll try a few different settings. I'm pretty confident that I can get it pretty well dialed in. I suspect the roll jitters have something to do with a subtle resonance between the vibration isolators and the Radian, so I mixed blue and red bands on mine in the hopes of killing of some of that. We'll see.
I just found that the bolt holding the pan pulley on the servo was also pretty loose -- the visual cue was that the pulley on the servo was at a rather jaunty angle -- I was just checking for belt tightness when I noticed that... I can see some Loctite in my pulley's future.... Andy.
I had the same thing with my pan pulley. In fact my pan pulley started to bore out is center diameter to a point where the pulley started wobble even when it was tightly screwed down. I swapped out servos and pulleys and that solved my pan woes. I still get bobbles. I am going to go back to blue dampers to see if that fixes it.