Official Answer
Answer
In rotating assemblies, centrifugal force can cause a wave spring to shift off-center if not properly piloted. A wave spring should be piloted either on its OD by a bore or on its ID by a shaft. The general rule is to provide a clearance of $0.010$ to $0.020$ inches. For an ID pilot, $ID_{shaft} = ID_{spring, work} - \text{clearance}$. For an OD pilot, $OD_{bore} = OD_{spring, work} + \text{clearance}$. It is vital to use the 'work height' dimensions because the spring expands radially upon compression. Failure to pilot correctly leads to 'walking' of the spring, causing unbalance and potential contact with other rotating components.
