[CHANMADD]

Any imbalance will be felt , like a road wheel out of balance. If you have a zero balance motor it means that you need a flywheel balanced to zero. If you put a 28 oz flywheel, one that has a 28 oz weight tacked on somewhere on the outer circumference of the flywheel , the motor will vibrate like mad, eventually breaking something. The balancing machine in the picture is supposed to have the piece being balanced spun , not too fast maybe 800 - 1000 rpm . The posts are mounted to the plate base which should be on rubber mounts to the feet. When spinning the slowly the posts will rock side to side. If you hold a chalk to the side of the flywheel by a fixed mount, it will leave a mark at the same spot as it rotates. This is the heavy spot. Drill at this spot or put a weight opposite. By the same method one could balance , theoretically one could balance the complete motor in place. Fifty tonne power station turbines are balanced this way.