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Posted to rec.crafts.metalworking
Ralph[_12_] Ralph[_12_] is offline
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Default rotational vibration

Karl Townsend wrote:
I'm repairing the same issue on my airblast sprayer for about the fifth
time. Own something long enough and the same problems keep repeating. the
sprayer has a vibration in it at 2500 tractor RPM, 540 PTO RPM. The
vibration is not like a tire out of balance but its a bucking forward to
reverse. When it gets a little lose, in a few more hours of run it will damn
near shake the tractor off the ground. Its also a natural harmonic at this
RPM, slow down and the vibration goes away. Unfortunately, this REALLY
reduces sprayer performance.

I'm replacing the entire PTO shaft and tightening up the clearance in the
gear box again. if everything is tight, the problem is less severe. The is
working on the symptom, not the cause.

This is a long shot, anybody know about balancing this sort of vibration or
changing the natural harmonic frequency?

Karl


So what do you repair to fix the problem? Changing over to 1000 RPM
shaft would help if its a PTO shaft problem.
You can check that the PTO shaft is telescoping freely. Also check that
the tractor PTO shaft and machine shaft are the same height and point at
each other.