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Balancing and Half Keys

 

QUESTION

What effect can using a half-key or no key have on the imbalance of a rotor?

ANSWER

A significant effect - see these recordings of the imbalance of a rotor with and without its half-key.

   

One example of where you should use a half-key is when you take a new rotor and spin it up on a balancing stand to check its balance. If you don't have the half-key in the rotor may appear more out of balance than what it will actually be when installed.