FIELD BALANCING

The forces on the bearings, structure, shaft, and couplings resulting from mass unbalance are unacceptable because they can lead to premature failures. The magnitude of the unbalance is dependent on the location of the geometric center, the total mass, and the square of the speed equals the force applied.

For example, the force created by a 3 ounce weight attached at a radius of 30 inches on a 1800 rpm. rotor is over 500 pounds. by doubling the speed to 3600 rpm. the unbalance force is increased to 2000 pounds.

The amount and position of the unbalance in any machine are unknown, and the proper correction in the selected correction planes must be established by tests 

Whether the unbalance is STATIC and or COUPLE, OVERHUNG DYNAMIC, or just DYNAMIC often balancing can be accomplished on site without having to remove the equipment for most narrow and wide rotors. Typically, a balancing service call will begin with an analysis of the vibration patterns in order to insure proper identification of the problem before any corrective action is attempted.

After the initial analysis it can be determined whether the unbalance applied to the rotor is STATIC( correctable with single plane methods) or COUPLE unbalance or a DYNAMIC combination (correctable using two or more plane balance methods).