Everything in nature vibrates at it’s own “Natural” Frequency”.If there is another vibration source present or near to the object,that is vibrating at the same natural frequency you will get amplification of that frequency . When you colide two waves together at the same frequency,the amplitude increases. Rotors have a natural frequency of 1200 to 1400 hz.If anything on a brake lathe is vibrating near to that Frequency range you will get a build up of ringing & chattering,as the tips hit the disk.
SO WHAT CAN YOU DO TO COMBAT THIS?
Hunter & Ranger have a machine in the market place that “oscillates”the motor speed.This means that The machine itself cannot vibrate at the same resonant frequency of the disk.However the finish is Compromised & large rotors may still vibrate due to resonance of the suspension system. Procut have gone the other way.The new machines have TDS tuned dampning system.
WHAT IF YOU CANNOT AFFORD A NEW MACHINE & HAVE AN OLD AMMCO OR FMC LATHE?
First of all,Service your machine to remove anything that is vibrating on it at the same resonant Frequency range.1200 to 1400 hz. Second,use the largest bells possible to mount your rotors.Disks now are getting larger & larger & require large 6.5” bells to dampen the resonant frequency Third,get a nickel plated chain & clip on silencer. Fourth.Get a Rotor stabilizer fitted.They are absolutely brilliant!