I designed and cut my own 6” quadcopter frame using a cheap CNC router. It’s had issues with high vibrations (mean ~15 m/s², peaks up to ~55 m/s² when I started). I’ve been revising the frame to track down the cause, including thickening the arms as suggested.
I also wanted to try damping grease between the arm plates and under the motors to see if it could reduce the vibrations enough to fly the quad while I work on the root cause. I did a test flight today and saw an improvement of about 10 m/s² in peak vibrations and 2–3 m/s² in the mean. Not bad, I thought.
The grease is extremely thick, almost like glue. I used Tribosyn PG44A.
With damping grease:
Without damping grease:
