It would seem that the rotating forces are balanced but, they quite
obviously are not!

The fact that they are needed to get a proper dynamic balancing is
sufficient for me - The balancing machine dictates!!

George (down under)

>          This is going to be a silly question to the experts, but I can't
> help but ask it:
>
>          I haven't been able to understand why the balance weight is even
> needed. I don't doubt that it is needed, but I don't understand why. I
look
> at the eccentric shaft, and it is symmetric. The rotors are 180 degrees
out
> in relation to each other. The rotors spin 1/3 as fast as the eccentric
> shaft, to which the balance weight is attached. How would the
> quickly-turning balance weight do anything in opposition to the rotors?
> What, exactly, does the balance weight counter balance?
>
>
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