What are the critical considerations for guide diameter sizing when installing a wave spring over a shaft?

When a wave spring is installed over a shaft, the inner diameter $D_i$ must be sized to account for the radial expansion that occurs during compression. The recommended shaft diameter $D_s$ should satisfy $D_s < D_i - \Delta D$, where $\Delta D$ is the radial expansion. If the shaft is too large, the spring will bind, causing a drastic increase in the effective spring rate and potential surface scoring. For high-speed rotating shafts, the spring should be piloted on the bore (housing) rather than the shaft to prevent centrifugal forces from causing the spring to expand and lose contact with its seat.