@pauljatherton wrote:
I have been doing some vibration testing today on my Tarot 680Pro hexa (setup in hexa-x layout), with Sunnysky x4108s kv690 motors. 5 of the motors are almost vibration free with VibeX, VibeY and VibeZ all under 2, when I spin the motors individually upto 80% of full. One motor however (motor 5) has its VibeZ reading shoot upto 15 - (mean value is 7), but strangely the graph shows regularly changing spikes between 2 and 15, whilst all other motors give fairly smooth lines.
So wondering what could cause this rapidly changing vibe reading on the Z axis of this one motor. These are the things I have tried so far:
- I have switched 3 props on this motor, all statically balanced to perfection. Made no difference!
- I have tested for bell end-float on this motor and there is none.
- Checked bearings are are in perfect condition
- I have tried balancing the bell by adding tape and moving it around, but see no real improvement on the Zvibe reading, so thinking its not a bell balancing issue.
- I checked the motor timing value set on the X-Rotor 40A ESC and it is correctly set to intermediate timing ( I don't hear any timing issues to be honest, but thought I'd check this one was set as per the others).I realise that these are very low vibe readings and I probably shouldn't be concerned, but I am just curious why this one motor is so different from the other 5. (to the point where I have just ordered another motor!
Any thoughts would be gratefully received. I'll post to report results of the new motor once it arrives - could be 4 weeks from GLB in China.
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