Key Takeaways:
A hydrostatic oil film is only 3–10 μm thick, so particles larger than that wreck it. Maintaining NAS 5 cleanliness and timely filter service is the single most important upkeep task.
A Film Thinner Than Hair
design 油膜 thickness在 精度 静压 component为just 3–10 μm—far thinner than human hair. A 单一 particle larger than gap can breach film, score surface,与destroy 精度.

NAS 5 Standard
Oil 清洁度 should reach NAS 5 or better. Multi-stage filtration 去除 particles,与 filter element为typically replaced around every 500 hours的operation以keep oil within spec.
为何 It Protects Everything
Clean oil protects restrictors, oil cavities (whose 平面度 must stay ≤0.5 μm),与 film itself. Skipping filtration为 fastest way以车削 理论上 infinite-life 轴承 into worn 一.