Why is one mass block enough to balance an unbalanced shaft?

[pikachoo]

Hi all,

I will like to check if I need to balance an out of balance shaft, why is the minimum number of mass block = 1

Is it because i can place the mass on the opposite end of the unbalanced mass at the same distance r away from the axis?

and how many are required to dynamically balance the shaft.

 

[Nidum]

Balancing of rotating parts is a complex and fascinating subject to discuss but we can't answer your particular questions without knowing more about the problem .

Please describe - or better sketch - the shaft that this problem relates to and tell us anything relevant about the purpose of the shaft and the running speeds .

 

[sophiecentaur]

Balancing needs to be correct under acceleration, too, in many circumstances - iirc, motor cars in particular need dynamic balancing so the wheels don't wobble under braking.

 

[pikachoo]

Balancing of rotating parts is a complex and fascinating subject to discuss but we can't answer your particular questions without knowing more about the problem .

Please describe - or better sketch - the shaft that this problem relates to and tell us anything relevant about the purpose of the shaft and the running speeds .

sorry, I am referring to a theoretical number. is a general question