Update International

Course Content

Overview of Unbalance Forces

• Understanding the various unbalance forces and how they affect each other
• Understanding various forms of dynamic unbalance; single plane unbalance, static unbalance, couple unbalance
• Effects of counterbalance force in various relationships to the real unbalance (when at the proper position; slightly off-angle; larger off-angle; how to keep under control).

Practical Techniques

• Ordinary two-plane rotor balancing
• Alternative methods for special two-plane balancing of narrow and overhung rotors
• Tolerance evaluation (including narrow and overhung rotors).
• Dealing with the difficulties provided by balancing tooling; balancing arbors; expansion mandrels; defective or non-precision tooling (such as non-square or dented shaft ends).
• Determining weight issues; adding, removing, splitting and combining weights to achieve a closer precision balance in the shortest time.
• Various means to obtain phase readings for field balancing

Other Practical Considerations

• Phase reading techniques for field balancing
• Determining true precision balance tolerances
• Understanding low speed balancing on shop balance versus high rotor operating speed balancing
• Determining and compensating for wide angle corrections
• Determining balance tolerances based on the various rotor type requirements: International standards, precision standards, and intermediate standards (for difficult situations)

Compensating for and Preventing Problems

• Errors due to size differences between available tooling and the rotor's actual shaft
• Errors due to relationship between shaft diameter and turning bearings
• Errors caused by improper setup
• Rotor assembly errors

Working with People who Affect the Final Product

• Contractors
• Machinery Manufacturers
• Outside and Inside Shops
• Supervisors unfamiliar with precision standards