Machined spring provides required accuracy and life

摘要

A combined compression and extension machined spring has replaced a wire wound spring in a demanding aerospace task. Whilst recently providing a product demonstration of the unique capabilities of the machined spring product, the experts at Abssac were asked an interesting question: "Would you be able to retrofit a spring now being used as a buffer spring in a fuel control system?" The spring unit should compress and extend 2mm but deliver an accurate spring rate over a set lifetime. The current wire wound spring was not providing an accurate spring rate over time and each spring had to be rate tested and certified before fitting. Normal rate accuracies were ranging from ±15% and were not linear in rate.