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Trial mass for balancing rotors

Trial mass for balancing rotors

Trial mass for balancing rotors

(OP)
Hello!

Do you know any "rule of the tumb" to choose the trial mass for balancing rotors?

Thank you!

RE: Trial mass for balancing rotors

Hi heitor

I have no rule of thumb for what mass you should choose to
start with, but I do have a reference to a method here how you can find out where to place your mass.

1/ rotate the rotor on knife edges

2/ the heavier section will stop at the bottom ie the lowest
   point.

3/mark the heavy point with chalk and place a small balance
  mass diametrically opposite.

4/ rotate the rotor through 90 degrees and again allow to
   rotate freely, again the heavier section will rotate to
   the bottom.

5/ The balance mass is now increased or decreased
   accordingly and the process repeated untill the rotor
   remains at rest in any position.

Hope this helps

regards desertfox

RE: Trial mass for balancing rotors

The kind of standard rule of thumb for field balancing is that you start with a weight that will cause a centrifugal force equal to 10 to 20% of the weight of the rotor. For light high speed rotors (like a compressor) I go 10% for heavy lower speed rotors (like a generator) I go 20%.

RE: Trial mass for balancing rotors

(OP)
Thank you all :)

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