Answer
Wave springs require mating surfaces to be flat and parallel within 0.05 mm per 25 mm of diameter. Niba igorofa cyangwa isahani yumuvuduko ihengamye, isoko yumuraba izagabanywa ku buryo butaringaniye, bivuze ko imiraba imwe izagera murwego rwakazi mugihe izindi zikiri zipakururwa. This results in a 'stiffening' effect where the initial spring rate appears lower than calculated, followed by a sharp increase. Ikigeretse kuri ibyo, 'umuyaga mwinshi' uzagira impungenge zirenze igipimo cyagenwe, biganisha kumurongo uhoraho cyangwa kunanirwa umunaniro. In precision optical assemblies, mating surfaces are often ground and lapped to ensure that the extremely low preloads required (often $<5$ N) are applied uniformly across the entire circumference.
