A lab mate and I got into a discussion on how to properly balance a swing bucket rotor. This is different than a normal centrifuge in that there are buckets that swing out once spinning begins. In a standard centrifuge balancing is simple - it's just the same weight directly opposite your sample. I've attached a picture of "A" and "B" - which is the correct way to balance the centrifuge? I argue that there is a vector Force (both a horizontal and vertical). One balance accounts for both, while the other only accounts for the horizontal. Arguably, the horizontal is much larger than the vertical, and it might not make a difference to not balance the vertical force..unless you have a huge amount of weight or extremely fast spin (and extremely fast spins do not use swinging buckets). Thanks!