Anyone into these yet?
The alexmos looks really cool as it basically smooths out the yaw problem. So now I would love to get something like this going on my quad with gopro...
So has anyone looked into this gimbal?
I'd like to get this but this stuff tends to come with no instructions and... well this looks kinda complicated. I have soldered the 2-axis.. Anyone tried to tackle the 3-axis? Not sure what this thing will do but it is priced right.
Replies
Please keep us in touch with what you do and how it works. I'm not quite ready to start working gimbals, but it is the next phase of my build.
You probably all ready know this, but if not ...
o uses an offset rotational method
o takes higher torque; puts the camera mass further away from the motor axis
o small 'jerks' at the motor get magnified at the camera
o to rotate the camera in more than one axis, the camera has to change its central location (you can't spin the camera around two axis at a time around the centerpoint of the sensor).
o each axis has serial impact on the other two. depending on yaw angle, the first motor is either camera pitch or roll or a mix. ditto the second motor. the third motor is either yaw or pitch or roll depending on the rotation of the other two motors.
None of that may matter to you as a photographer and in fact can be used to create interesting (and unexpected) motion.
But the primary issue for a multi-copter is that use of the first and second motor will change the CG of your ship. That will affect the stability of the ship. Your ship, whether you know it or not, is tuned for a specific motor torque to mass torque ratio. Move the camera around like that and this will have adverse affects. But, if you are just out there to have fun and experiment, that probably won't matter either unless the full rotational envelop interferes with the props.
If you care about the above when comparing gimbals:
o does one axis of movement change the central location of the camera's CG? no is good
o what is the envelope required to fully rotate the camera? only the size of the camera is good
o does one axis of movement also rotate the other axis to keep them aligned for what they do (roll, pitch and yaw)?