ABSTRACT
Perfect alignment is seldom achieved but good alignment can and should be possible for any machine of which continuous, reliable operation is demanded. Poor alignment can cause vibration and wear and lead to premature failure of bearings, seals, couplings and other machine elements. Despite the fact that flexible couplings can tolerate quite significant degrees of misalignment, it is recommended that shaft alignment should always be as accurate as possible as any misalignment present will set up vibration patterns that will be transmitted through the machine and tend to cause wear. Alignment is a critical aspect of machinery operation and the techniques used should be properly understood.
