Strong Vibration from one motor

[Gero]

That does not sound good.
Swapping the cables and still the same motor, is pointing to the motor.
I would send @hannah an email to get a new one on the way fast.
Some friends here have taken the gearbox apart to count the teeth. Will try to find the pictures in case you need something to do while you are waiting for the new motor

Couple of questions that don’t make sense any more after reading the description:

• Did you try ->Test motors/encoders in GC?
• What firmware and GroundControl version are you using and have you tested if the noise is the same with 1 or 2 versions back?
• Did you play with settings in GrounControl?

Edit:

@Gero

Will try to find the pictures

Whats inside the gearbox/motor?

So following in the footsteps of our patron saints AvE & Dave Jones, I took apart my gear box to see what secrets it held inside. Here is what I have found… [image][image] The gearbox (from my counting) as a 23:1 ratio from the motor output to output shaft. Both ends of the output shaft ride on a shielded bearing. Most of the gears are powdered metal with the exception of the worm shaft(motor output, single toothed, brass?) and the worm wheel (plastic). Each gear is held in place with steel …