Many machine problems trace back to two simple causes: misalignment and imbalance. Addressing them early extends the life of bearings, seals and couplings, and reduces energy consumption.
Why Alignment Matters
When a motor and driven machine are not collinear, the coupling is forced to flex on every revolution. This generates cyclic loads, heat and vibration. Misalignment can be angular, parallel (offset) or a combination of both.
Alignment Methods
- Straightedge and feeler gauges: a basic method suited only to low-speed, non-critical equipment.
- Dial indicators: a traditional method that offers good accuracy in skilled hands.
- Laser alignment systems: the modern standard, giving fast, precise corrections and documented results.
Before aligning, check for soft foot, pipe strain and worn components. Allow for thermal growth when machines run hot.
Vibration Basics
Vibration is measured as displacement, velocity or acceleration. A frequency spectrum shows peaks that correspond to specific faults: one times running speed often indicates imbalance, two times running speed commonly points to misalignment, and high-frequency peaks can signal bearing defects.
Balancing
Rotors can be balanced in place by adding or removing small amounts of mass. Field balancing is quick and often resolves high vibration without disassembly.
Putting It Together
Use vibration data to verify alignment quality after maintenance and to identify when problems return. Together, these practices form a solid basis for any reliability program.