Discuss the use of 'Gap' vs. 'Overlap' in single-turn wave spring assembly for rotating equipment.

Single-turn wave springs are available in 'Gap Type' or 'Overlap Type.' The Gap Type has a physical break between the ends of the wire, which prevents the ends from binding if the spring expands radially in a bore. However, the gap can cause 'catch points' during automated assembly. The Overlap Type ensures that the ends overlap, providing a continuous $360°$ surface for the mating part. This is often preferred in high-speed rotating equipment as it maintains a more balanced mass distribution and prevents the ends from 'digging' into the seat. The designer must ensure that the overlap length does not interfere with the wave peaks during full compression.