Question: Why is balancing necessary ?

Question: Is it necessary to install a dynamic Balancing Machine on a special foundation?

Question: In balancing terminology what is a rotor?

Two unbalances (shown here as arrows) can have the same size and angular position and can be the same distance from the centre of gravity. The same condition results from an individual unbalance, twice as large, that acts at the centre of gravity, i.e. in this case in the middle of the rotor.

Question: What are the units of unbalance?

Question: Do I have to balance at operational speed ?